Fazlollah Changani - Academia.edu (original) (raw)

Papers by Fazlollah Changani

Journal of Cleaner Production, 2020

Results in engineering, Jul 1, 2024

Journal of Mazandaran University of Medical Sciences, 2004

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International Journal of Environmental Science and Technology, 2021

In the last three decades, pharmaceuticals research has increased tremendously to offer safe and ... more In the last three decades, pharmaceuticals research has increased tremendously to offer safe and healthy life, though it emerged as a new threat to the environment. These pharmaceutical residues pose a threat to the public health, and ecological balance, particularly in surface water located in agricultural catchments are facing more serious challenges. If these pharmaceutical residues left untreated could contaminate soil, water and may lead to serious outbreaks. However, many conventional treatments are integrated into wastewater treatment plants (WWTP's), but there is a lack of dedicated treatment in eliminating pharmaceutical residues. Thus, dedicated on-site treatment at source (such as Hospitals and pharmaceutical industries) is essentially needed before discharging effluent to sewers or water bodies. Furthermore, the potential impact of pharmaceutical compounds even in trace concentration is more severe than the other pollutants present in the environment. In contrast, very limited knowledge about how such compounds and their kinetics directly impacts the environment and long-term impacts on humans. Traces of antibiotic compounds in the aquatic environment lead to resistant bacterial strains, exhibit threat to organisms and human health, hence affecting treatment. The recent literature reported that the pharmaceutical residues enter the environment in trace level. But, in long terms, these pharmaceuticals, even in trace concentration, has a potential threat to human health and terrestrial ecosystem. In this review article, we summarize the pharmaceutical residues potential to cause disease outbreaks in community and eco-toxicological impacts on aquatic organisms. Herein, we have reviewed the literature (1996-2020) to draw worldwide attention on rising pharmaceutical residues in the environment and associated impacts, disease outbreaks and eco-hazards.

Archives of Materials Science and Engineering, 2020

Purpose: This investigation aims to study the various approaches currently used to reduce the loa... more Purpose: This investigation aims to study the various approaches currently used to reduce the load on computer servers in order to better manage data on hospital wastewater treatment and solid waste generation. Design/methodology/approach: This manuscript investigates the taxonomies of deduplication procedures based on literature and other data sources, thereby presenting its classification and its challenges in detection. Findings: Based on the literature survey of deduplication techniques, the method of deduplication dispensed on cloud gadget devices has been found to be a promising research challenge. The gaps discussed include a reduction in storage space, bandwidth, type of disks used, and expenditure on energy usage and heat emissions when implementing these strategies. The art work on a scalable, robust, green and allocated approach to deduplication for a cloud gadget will remain of interest in destiny. Research limitations/implications: Considerable attention is focused on t...

Journal of Applied Sciences, 2007

Environmental Technology, 2006

The Chlorophyceae are a large and important group of green algae. They include some of the most c... more The Chlorophyceae are a large and important group of green algae. They include some of the most common species, as well as many members that are important both ecologically and scientifically. When abundant in the water, they can rapidly cover the surface of sand filters and drastically reduce the length of filter runs. Also, tastes and odors are caused by the release of certain compounds by both living algae and dead and decomposing algae. This study will provide basic information on the fundamentals of acoustic cavitation as a new technology for control of Chlorophyceae growth. This technology is an attractive means to improve water quality because of the simplicity of the system and no production of toxic by-products. The inactivation of Chlorophyceae is mainly due to cavitation. Cavitation is a primary mechanism of ultrasound waves that occurs when the gas vesicles are acted upon by sufficiently intense ultrasound waves of different frequencies. Waves collapse gas vacuoles and precipitate Chlorophyceae. Also damage is inflicted on the chlorophyll of Chlorophyceae. Experiments have been carried out using ultrasound reactor in a laboratory pilot plant, to investigate the effect of acoustic cavitation. The results show that increasing the short exposure to waves has a considerable effect on destruction of Chlorophyceae growth and results in the loss of buoyancy. At 42 kHz it is shown that 100% of the Chlorophyceae can be destroyed in 130 seconds.

The management of medical waste is of great importance due to its potential environmental hazards... more The management of medical waste is of great importance due to its potential environmental hazards and public health risks. In the past, medical waste was often mixed with municipal solid waste and disposed in residential waste landfills or improper treatment facilities in Iran. In recent years, many efforts have been made by environmental regulatory agencies and waste generators to better managing the wastes from healthcare facilities. This study was carried in 12 educational hospitals of Tehran University of Medical Sciences. The goals of this study were to characterize solid wastes generated in healthcare hospitals, to report the current status of medical waste management and to provide a framework for the safe management of these wastes at the considered hospitals. The methodology was descriptive, crosssectional and consisted of the use of surveys and interviews with the authorities of the healthcare facilities and with personnel involved in the management of the wastes. The results showed that medical wastes generated in hospitals were extremely heterogeneous in composition. 42% of wastes were collected in containers and plastic bags. In 75% of hospitals, the stay-time in storage sites was about 12-24h. 92% of medical wastes of hospitals were collected by covered-trucks. In 46% of hospitals, transferring of medical wastes to temporary stations was done manually. The average of waste generation rates in the hospitals was estimated to be 4.42kg/bed/day.

HAKIM, 2008

Methods: This descriptive cross-sectional study was performed in year 2006. Data were collected u... more Methods: This descriptive cross-sectional study was performed in year 2006. Data were collected using a checklist and a questionnaire whose validity and reliability were verified. Results: The medical wastes generated in these hospitals were extremely heterogeneous in composition: paper and cardboard, plastic, syringes, glass, metals, food wastes, infectious wastes, etc. Forty two percent of the wastes were collected in containers and plastic bags. In 75% of the studied hospitals, the stay-time in storage sites was about 12-24 hours. All of ...

Air pollution is a major problem in Tehran. Most important agents responsible for the high pollut... more Air pollution is a major problem in Tehran. Most important agents responsible for the high pollution include carbon monoxide, sulfur dioxide, nitrogen dioxide, hydrocarbons and suspended particles. Determination of quality and quantity of polluting agents is of great importance for sustaining the inhabitants health level. We studied carbon monoxide, one of the most hazardous air-polluting agents, in 22 urban districts of Tehran. The results showed that in average 4.39% of the air in Tehran has a CO concentration of 15-30 ppm. The 12th district with 17.99% and 11th district with 16.43% had the highest pollution of carbon monoxide. 6th and 7th districts had 11.22% and 9.5% respectively. The lowest level of pollution was found in 21st district (0%) and 1st district (0.11%). Variance analysis of districts of Tehran showed that there is a significant relation between mean air pollution of 11th and 12th districts and other districts.

Environmental Science and Pollution Research

Groundwater is a primary natural water source in the absence of surface water bodies. Groundwater... more Groundwater is a primary natural water source in the absence of surface water bodies. Groundwater in urban environments experiences unprecedented stress from urban growth, population increase, and industrial activities. This study assessed groundwater quality in terms of arsenic and heavy metal contamination in three industrial areas (Shahdara, Jhilmil, and Patparganj), Delhi, India. The water quality was assessed over a 3-year time interval (i.e., 2015 and 2018). The groundwater constituents investigated were As, Fe, Cr, Cd, Ni, Zn, Mn, Cu, and Pb. Metal index and heavy metal pollution indexes were estimated to assess groundwater pollution. The health risk was evaluated in terms of non-carcinogenic and carcinogenic risk assessment. Patparganj industrial area saw increment in concentration for Cu 0.23 mg/L (2015)–0.85 mg/L (2018), Zn 0.51 mg/L (2015)–7.2 mg/L (2018), Fe 0.32 mg/L (2015)–0.9 mg/L (2018), Cr 0.21 mg/L (2015)–0.26 mg/L (2018), Mn 0.14 mg/L (2015)–0.25 mg/L (2018), Ni 0.04 mg/L (2015)–0.34 mg/L (2018), and As 0.01 mg/L (2015)–0.18 mg/L (2018). Cd and Pb concentrations were observed to decrease by 40–90 % and 85–99% for all the three industrial areas. Metal index and heavy metal index values were found to be >1 for all locations. The risk quotient value > 1 was observed for all locations in the year 2015 but was found to increase further to a range of RQ 10–62 in the year 2018, inferring increased non-carcinogenic risk to consumers. The carcinogenic risk was significant with respect to Fe (0.2–0.7), Zn (0.001–0.007), and As (0.002–0.003) for all locations in the year 2015. This study concludes that groundwater in the three industrial areas is highly polluted and is not fit for human consumption. Further studies are required to explore possible control measures and develop methods to mitigate groundwater pollution, sustainable management, and optimized use to conserve it for future generations.

DESALINATION AND WATER TREATMENT

DESALINATION AND WATER TREATMENT

DESALINATION AND WATER TREATMENT

Journal of Environmental Health Engineering

Background: 2،4 dichlorophenol (DCP), one of the most chlorophenol compounds family with highly t... more Background: 2،4 dichlorophenol (DCP), one of the most chlorophenol compounds family with highly toxic effect, exists in agricultural areas, chlorinated waters, discharging wastewater of pulp industries and paper factories. Chlorophenols can cause damages to the kidneys, liver, pancreas and weaken the central nervous system (CNS). In the current study we would evaluate the adsorption of DCP by chitosan in aqueous environments. Materials and Methods: In this study we evaluated the effect of operational parameters such as time (15-90min), pH values (3-9), initial concentration of DCP(15-100mg/l)and the dose of chitosan (0.1-0.9g) in a batch reactor. A spectrophotometer at wavelength of 280nm was used to measure the concentration of DCP. Freundlich and Langmuir isotherm models and Pseudo-first order kinetic models and Pseudo-second-order kinetic was drawn by using of the results obtained in the absorption process. Results: Equilibrium time in the adsorbtion process was estimated to be 75 minutes (DCP Concentration-15mg/l, Chitosan Concentration-0.5g and pH-6.5) with 76% removal efficiency. PH=3 was calculated as the optimal PH in absorption process (DCP Concentration-15mg/l, Chitosan Concentration-0.5g and Time Equilibrium-75 min) with efficiency 79% and the value of efficiency decreased by increasing PH. In 15 mg/l concentration of DCP maximum adsorption with an efficiency of 79% was observed. (Chitosan Concentration-0.5g, Time Equilibrium-75 min and pH-3) and the maximum 87% adsorption efficiency of DCP was observed at the 0.08mg/l absorbent dose of chitosan. (DCP Concentration-15mg/l, time equilibrium-75 min and pH=3). Adsorption process follows of Freundlich isotherm with correlation coefficient of 0.9599 and the pseudo second order kinetic model with correlation coefficient of 0.9649. Conclusion: According to results of the study, chitosan can be used to remove of DCP from industrial wastewater due to of its perfect characteristics such as biodegradability, resurgent ability, low cost and adsorption acceptable efficiency.

Environmental Technology, 2003

Batch experiments were carried out for the removal of cyanide in the effluent of plating industry... more Batch experiments were carried out for the removal of cyanide in the effluent of plating industry by the application of advanced oxidation processes. Four systems with different modes of oxidation in combination of ultra violet (UV) light with hydrogen peroxide and/or ozone were investigated. Of all the applied systems, UV-light with two oxidants, i.e. O3 (32 mg min(-1)), and H2O2 (1.36 g l(-1)) was found successful in bringing down the amount of cyanide from 157.32 mg l(-1) to 1.0 mg l(-1), which is the limit set by the Ministry of Environment of Korea for cyanide-containing discharges. Other systems, however, could not bring the cyanide abatement to the targeted value even with higher dosage of oxidants and an extended period of reaction time. Regardless of the oxidation modes applied, all the heavy metal ions in the treated effluent were reduced to 90%. Ultra violet light with the combination of two oxidants had the economic preference over the other systems since a relatively lower dosage of UV-light (2484 W-S cm(-2)) was found effective at achieving the targeted level of cyanide removal.

Iranian Journal of Health and Environment, 2012

Abstract: Background and Objectives: since there is not any information about the quality and qua... more Abstract: Background and Objectives: since there is not any information about the quality and quantity of carpet cleaning wastewater, this study was done for the evaluation of carpet cleaning wastewater characterization in Tehran. Materials and Methods: There are 122 carpet-cleaning units in Tehran. Compound samplings were taken from 10 randomly selected carpet-cleaning units. Each unit was sampled 5 times and analyzed based on the Standard Methods. Quality parameters measured included chemical oxygen demand ( ...

DESALINATION AND WATER TREATMENT

International Journal of Environmental Analytical Chemistry

Hospital wastewater (HWW) is one of the largest sources of pharmaceutical release. The present pa... more Hospital wastewater (HWW) is one of the largest sources of pharmaceutical release. The present paper proposes the sustainable and controllable hospital wastewater treatment method based on the phot...

Journal of Cleaner Production, 2020

Results in engineering, Jul 1, 2024

Journal of Mazandaran University of Medical Sciences, 2004

6 ف ه و /) " : ! " # # $ % " & ' ! ()" * . ,% * . # /! 0 0 1 . 0 . '.... more 6 ف ه و /) " : ! " # # $ % " & ' ! ()" * . ,% * . # /! 0 0 1 . 0 . '. ! '2 34 # 56 7 6859 /: ; < . شور و دا ه : = ,% , > ? @ A ,% * 34 # 0 '2 0 . '. ! . > B . 6859 ! / C6856 /. > . 0 D E 0 B ( @ capture re-capture ; < %# 1 F,: F@ GF& F /F: FHD ( IJ /KL G& M '# => !N 0 = D : F D F@ MFP Q F ... F 1 . > N . = F 0 F F F. # 0 F H R "F. " 'F. > ?'F. > N D . # / 2# * , . '. ? ه : FFFF, S TFFF& *FFF 5UV MFF FF FFF FFFF @ FF D FFF ) 5V / 85 FFFF@ ( mesobuthus eupeus eupeus , ) 6V / [6 ( % mesobuthus eupeus philipowitschi 3H,' ND > , * > > B 5 / 69 @ G# 6V / 5] @ > G# . ج ':'"ا : ^J ': ND > %# / D _ ` " & a , S ( P ; < bS & * A c IB , d ..... 0 e %# % P /2 ( @ IB . . a . ي 6 آ ي ه ژاو : = = / F" > F F F ! F2P F " & ' ! ()" *

International Journal of Environmental Science and Technology, 2021

In the last three decades, pharmaceuticals research has increased tremendously to offer safe and ... more In the last three decades, pharmaceuticals research has increased tremendously to offer safe and healthy life, though it emerged as a new threat to the environment. These pharmaceutical residues pose a threat to the public health, and ecological balance, particularly in surface water located in agricultural catchments are facing more serious challenges. If these pharmaceutical residues left untreated could contaminate soil, water and may lead to serious outbreaks. However, many conventional treatments are integrated into wastewater treatment plants (WWTP's), but there is a lack of dedicated treatment in eliminating pharmaceutical residues. Thus, dedicated on-site treatment at source (such as Hospitals and pharmaceutical industries) is essentially needed before discharging effluent to sewers or water bodies. Furthermore, the potential impact of pharmaceutical compounds even in trace concentration is more severe than the other pollutants present in the environment. In contrast, very limited knowledge about how such compounds and their kinetics directly impacts the environment and long-term impacts on humans. Traces of antibiotic compounds in the aquatic environment lead to resistant bacterial strains, exhibit threat to organisms and human health, hence affecting treatment. The recent literature reported that the pharmaceutical residues enter the environment in trace level. But, in long terms, these pharmaceuticals, even in trace concentration, has a potential threat to human health and terrestrial ecosystem. In this review article, we summarize the pharmaceutical residues potential to cause disease outbreaks in community and eco-toxicological impacts on aquatic organisms. Herein, we have reviewed the literature (1996-2020) to draw worldwide attention on rising pharmaceutical residues in the environment and associated impacts, disease outbreaks and eco-hazards.

Archives of Materials Science and Engineering, 2020

Purpose: This investigation aims to study the various approaches currently used to reduce the loa... more Purpose: This investigation aims to study the various approaches currently used to reduce the load on computer servers in order to better manage data on hospital wastewater treatment and solid waste generation. Design/methodology/approach: This manuscript investigates the taxonomies of deduplication procedures based on literature and other data sources, thereby presenting its classification and its challenges in detection. Findings: Based on the literature survey of deduplication techniques, the method of deduplication dispensed on cloud gadget devices has been found to be a promising research challenge. The gaps discussed include a reduction in storage space, bandwidth, type of disks used, and expenditure on energy usage and heat emissions when implementing these strategies. The art work on a scalable, robust, green and allocated approach to deduplication for a cloud gadget will remain of interest in destiny. Research limitations/implications: Considerable attention is focused on t...

Journal of Applied Sciences, 2007

Environmental Technology, 2006

The Chlorophyceae are a large and important group of green algae. They include some of the most c... more The Chlorophyceae are a large and important group of green algae. They include some of the most common species, as well as many members that are important both ecologically and scientifically. When abundant in the water, they can rapidly cover the surface of sand filters and drastically reduce the length of filter runs. Also, tastes and odors are caused by the release of certain compounds by both living algae and dead and decomposing algae. This study will provide basic information on the fundamentals of acoustic cavitation as a new technology for control of Chlorophyceae growth. This technology is an attractive means to improve water quality because of the simplicity of the system and no production of toxic by-products. The inactivation of Chlorophyceae is mainly due to cavitation. Cavitation is a primary mechanism of ultrasound waves that occurs when the gas vesicles are acted upon by sufficiently intense ultrasound waves of different frequencies. Waves collapse gas vacuoles and precipitate Chlorophyceae. Also damage is inflicted on the chlorophyll of Chlorophyceae. Experiments have been carried out using ultrasound reactor in a laboratory pilot plant, to investigate the effect of acoustic cavitation. The results show that increasing the short exposure to waves has a considerable effect on destruction of Chlorophyceae growth and results in the loss of buoyancy. At 42 kHz it is shown that 100% of the Chlorophyceae can be destroyed in 130 seconds.

The management of medical waste is of great importance due to its potential environmental hazards... more The management of medical waste is of great importance due to its potential environmental hazards and public health risks. In the past, medical waste was often mixed with municipal solid waste and disposed in residential waste landfills or improper treatment facilities in Iran. In recent years, many efforts have been made by environmental regulatory agencies and waste generators to better managing the wastes from healthcare facilities. This study was carried in 12 educational hospitals of Tehran University of Medical Sciences. The goals of this study were to characterize solid wastes generated in healthcare hospitals, to report the current status of medical waste management and to provide a framework for the safe management of these wastes at the considered hospitals. The methodology was descriptive, crosssectional and consisted of the use of surveys and interviews with the authorities of the healthcare facilities and with personnel involved in the management of the wastes. The results showed that medical wastes generated in hospitals were extremely heterogeneous in composition. 42% of wastes were collected in containers and plastic bags. In 75% of hospitals, the stay-time in storage sites was about 12-24h. 92% of medical wastes of hospitals were collected by covered-trucks. In 46% of hospitals, transferring of medical wastes to temporary stations was done manually. The average of waste generation rates in the hospitals was estimated to be 4.42kg/bed/day.

HAKIM, 2008

Methods: This descriptive cross-sectional study was performed in year 2006. Data were collected u... more Methods: This descriptive cross-sectional study was performed in year 2006. Data were collected using a checklist and a questionnaire whose validity and reliability were verified. Results: The medical wastes generated in these hospitals were extremely heterogeneous in composition: paper and cardboard, plastic, syringes, glass, metals, food wastes, infectious wastes, etc. Forty two percent of the wastes were collected in containers and plastic bags. In 75% of the studied hospitals, the stay-time in storage sites was about 12-24 hours. All of ...

Air pollution is a major problem in Tehran. Most important agents responsible for the high pollut... more Air pollution is a major problem in Tehran. Most important agents responsible for the high pollution include carbon monoxide, sulfur dioxide, nitrogen dioxide, hydrocarbons and suspended particles. Determination of quality and quantity of polluting agents is of great importance for sustaining the inhabitants health level. We studied carbon monoxide, one of the most hazardous air-polluting agents, in 22 urban districts of Tehran. The results showed that in average 4.39% of the air in Tehran has a CO concentration of 15-30 ppm. The 12th district with 17.99% and 11th district with 16.43% had the highest pollution of carbon monoxide. 6th and 7th districts had 11.22% and 9.5% respectively. The lowest level of pollution was found in 21st district (0%) and 1st district (0.11%). Variance analysis of districts of Tehran showed that there is a significant relation between mean air pollution of 11th and 12th districts and other districts.

Environmental Science and Pollution Research

Groundwater is a primary natural water source in the absence of surface water bodies. Groundwater... more Groundwater is a primary natural water source in the absence of surface water bodies. Groundwater in urban environments experiences unprecedented stress from urban growth, population increase, and industrial activities. This study assessed groundwater quality in terms of arsenic and heavy metal contamination in three industrial areas (Shahdara, Jhilmil, and Patparganj), Delhi, India. The water quality was assessed over a 3-year time interval (i.e., 2015 and 2018). The groundwater constituents investigated were As, Fe, Cr, Cd, Ni, Zn, Mn, Cu, and Pb. Metal index and heavy metal pollution indexes were estimated to assess groundwater pollution. The health risk was evaluated in terms of non-carcinogenic and carcinogenic risk assessment. Patparganj industrial area saw increment in concentration for Cu 0.23 mg/L (2015)–0.85 mg/L (2018), Zn 0.51 mg/L (2015)–7.2 mg/L (2018), Fe 0.32 mg/L (2015)–0.9 mg/L (2018), Cr 0.21 mg/L (2015)–0.26 mg/L (2018), Mn 0.14 mg/L (2015)–0.25 mg/L (2018), Ni 0.04 mg/L (2015)–0.34 mg/L (2018), and As 0.01 mg/L (2015)–0.18 mg/L (2018). Cd and Pb concentrations were observed to decrease by 40–90 % and 85–99% for all the three industrial areas. Metal index and heavy metal index values were found to be >1 for all locations. The risk quotient value > 1 was observed for all locations in the year 2015 but was found to increase further to a range of RQ 10–62 in the year 2018, inferring increased non-carcinogenic risk to consumers. The carcinogenic risk was significant with respect to Fe (0.2–0.7), Zn (0.001–0.007), and As (0.002–0.003) for all locations in the year 2015. This study concludes that groundwater in the three industrial areas is highly polluted and is not fit for human consumption. Further studies are required to explore possible control measures and develop methods to mitigate groundwater pollution, sustainable management, and optimized use to conserve it for future generations.

DESALINATION AND WATER TREATMENT

DESALINATION AND WATER TREATMENT

DESALINATION AND WATER TREATMENT

Journal of Environmental Health Engineering

Background: 2،4 dichlorophenol (DCP), one of the most chlorophenol compounds family with highly t... more Background: 2،4 dichlorophenol (DCP), one of the most chlorophenol compounds family with highly toxic effect, exists in agricultural areas, chlorinated waters, discharging wastewater of pulp industries and paper factories. Chlorophenols can cause damages to the kidneys, liver, pancreas and weaken the central nervous system (CNS). In the current study we would evaluate the adsorption of DCP by chitosan in aqueous environments. Materials and Methods: In this study we evaluated the effect of operational parameters such as time (15-90min), pH values (3-9), initial concentration of DCP(15-100mg/l)and the dose of chitosan (0.1-0.9g) in a batch reactor. A spectrophotometer at wavelength of 280nm was used to measure the concentration of DCP. Freundlich and Langmuir isotherm models and Pseudo-first order kinetic models and Pseudo-second-order kinetic was drawn by using of the results obtained in the absorption process. Results: Equilibrium time in the adsorbtion process was estimated to be 75 minutes (DCP Concentration-15mg/l, Chitosan Concentration-0.5g and pH-6.5) with 76% removal efficiency. PH=3 was calculated as the optimal PH in absorption process (DCP Concentration-15mg/l, Chitosan Concentration-0.5g and Time Equilibrium-75 min) with efficiency 79% and the value of efficiency decreased by increasing PH. In 15 mg/l concentration of DCP maximum adsorption with an efficiency of 79% was observed. (Chitosan Concentration-0.5g, Time Equilibrium-75 min and pH-3) and the maximum 87% adsorption efficiency of DCP was observed at the 0.08mg/l absorbent dose of chitosan. (DCP Concentration-15mg/l, time equilibrium-75 min and pH=3). Adsorption process follows of Freundlich isotherm with correlation coefficient of 0.9599 and the pseudo second order kinetic model with correlation coefficient of 0.9649. Conclusion: According to results of the study, chitosan can be used to remove of DCP from industrial wastewater due to of its perfect characteristics such as biodegradability, resurgent ability, low cost and adsorption acceptable efficiency.

Environmental Technology, 2003

Batch experiments were carried out for the removal of cyanide in the effluent of plating industry... more Batch experiments were carried out for the removal of cyanide in the effluent of plating industry by the application of advanced oxidation processes. Four systems with different modes of oxidation in combination of ultra violet (UV) light with hydrogen peroxide and/or ozone were investigated. Of all the applied systems, UV-light with two oxidants, i.e. O3 (32 mg min(-1)), and H2O2 (1.36 g l(-1)) was found successful in bringing down the amount of cyanide from 157.32 mg l(-1) to 1.0 mg l(-1), which is the limit set by the Ministry of Environment of Korea for cyanide-containing discharges. Other systems, however, could not bring the cyanide abatement to the targeted value even with higher dosage of oxidants and an extended period of reaction time. Regardless of the oxidation modes applied, all the heavy metal ions in the treated effluent were reduced to 90%. Ultra violet light with the combination of two oxidants had the economic preference over the other systems since a relatively lower dosage of UV-light (2484 W-S cm(-2)) was found effective at achieving the targeted level of cyanide removal.

Iranian Journal of Health and Environment, 2012

Abstract: Background and Objectives: since there is not any information about the quality and qua... more Abstract: Background and Objectives: since there is not any information about the quality and quantity of carpet cleaning wastewater, this study was done for the evaluation of carpet cleaning wastewater characterization in Tehran. Materials and Methods: There are 122 carpet-cleaning units in Tehran. Compound samplings were taken from 10 randomly selected carpet-cleaning units. Each unit was sampled 5 times and analyzed based on the Standard Methods. Quality parameters measured included chemical oxygen demand ( ...

DESALINATION AND WATER TREATMENT

International Journal of Environmental Analytical Chemistry

Hospital wastewater (HWW) is one of the largest sources of pharmaceutical release. The present pa... more Hospital wastewater (HWW) is one of the largest sources of pharmaceutical release. The present paper proposes the sustainable and controllable hospital wastewater treatment method based on the phot...