IJSER-Rethinking-Environmental-Friendly-Technology-for-Sustainability-in-Bangladesh (original) (raw)
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Cost effective technology in Garment sectors and its importance for environment in Bangladesh
Most of the textile industry discharges the polluted textile wastewater directly into the waterways as the cost of treatment process is high. To minimize the cost, an effective and advanced treatment process has been setup at Mascom Composite Textile Ltd and Dalas Fashion Ltd. at Gazipur, Dhaka. The treatment process consists of a combined process (anaerobic and bio-filtration process) which is mentioned as High Rate Biological Treatment (HRBT) process. This biological treatment process is successfully operating without chemical process. The raw textile wastewater is highly polluted with high level of alkalinity in nature. The pollution parameters were removed successfully with standard quality by using the HRBT process. The ETP treatment capacity was 50,000 Liter/hour. Case study on chemical ETP process has reveled that taka 89.84 lac is required for chemical ETP against taka 17.84 lac for HRBT ETP process. Thus HRBT ETP process has been proved to be highly economical than the Chemical ETP process.
Evaluation of Textile Wastewater Treatment Via ETP in Bangladesh
INTERNATIONAL JOURNAL OF RESEARCH AND SCIENTIFIC INNOVATION (IJRSI), 2024
Textile liquid waste possesses a substantial biochemical oxygen demand and total suspended solids, hence posing a significant risk of contaminating adjacent water bodies if not appropriately managed. The primary aim of the study is to examine the pH condition of water from the inlet and outlet of the ETP (Effluent Treatment Plant) in two specific regions. Two natural groups in Bangladesh include Tonga Bari, Ashulia, Savar, and Dhaka. Another natural group is "The Emakulet Textile Ltd," located in Purboponchash, Dhamrai, Dhaka. Raw liquid waste was collected from two textile industry and applied some test procedure in the laboratory by varying different design parameters such as pH, DO (Dissolved Oxygen), BOD5 (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand), TDS(Total Dissolved Solids), TSS (Total Suspended Solids), Turbidity, Fe2+ , pH was tested by a pH meter at 25℃ temperature. DO also tested by a sensor machine (FLEXA) which shows the values of dissolved oxygen in ETP waste water. To collect BOD5 value needed 5 days minimum also used MnSO4, H2SO4 to get BOD5 value from the incubator. Turbidity was tested by Digital Turbidity meter. The results showeds that the pH condition of water from the inlet is satisfied but others parameter from the inlet sample is not in the range of ECR, 1997. The selected two areas of ETP given the maximum and minimum parameters found, DO in the inlet of two selected areas was (0) from the inlet. The maximum BOD5 value was 126 mg/l from the inlet which crosses the limit of ECR-1997 but after treatment it was 47 mg/l. The detailed experimental results demonstrated that, ETP water is fully treated and all parameter acceptable according to ECR, 1997. In this analysis, it is anticipated that the implementation of a cost-effective treatment approach could serve as an incentive for industrial proprietors to engage in effluent treatment, so contributing to the enhancement of water body quality in Bangladesh.
http://www.ijsred.com/volume2/issue5/IJSRED-V2I5P88.pdf, 2019
Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater may be reused or released to a sanitary sewer or to surface water in the environment. The textile dyeing and washing industry plays an important role in the economic growth as well as the environmental sectors of Bangladesh. Effluent Treatment Plants or (ETPs) are used by leading companies in the pharmaceutical and chemical industry to purify water and remove any toxic and non-toxic materials or chemicals from it. These plants are used by all companies for environment protection. Effluent Treatment Plant (ETP) is one of the most important & prominent part of Textile dyeing / Wet process industry. In Bangladesh many industrial units are located near the banks of the rivers and they do not use Effluent Treatment Plant (ETP) for wastewater treatment. As a consequence, industrial units dump effluent directly into the river water without consideration of the environment. To combat ecological degradation it is mandatory for textile dyeing / wet process industry to install an effective effluent treatment plant (ETP). This study, focused on investigating the best possible solution to install the most economic and effective effluent treatment plantof textile dyeing / wet process industries in Bangladesh. None of the methods except biological method can satisfy discharge standard. Combined physico-chemical and biological method is considered as the most efficient method. The discharged water is properly treated in the ETP plant to ensure that the discharged waste water is not harmful for environment.Important water quality parameters like pH, TSS, BOD, COD and presence of metals were measured by testing samples. The samples were collected from effluent water of a renowned and international buyer recognized industry named Wash & Wear Ltd in Ashulia, Savar, Bangladesh. The results show that all the water quality parameters are within the permissible limits. Keywords—Waste water, Effluent treatment plant (ETP), Biological treatment, efficiency, water quality, Lab type ETP, BOD, COD, PH, Environment, etc.
Performance Evaluation of Textile Effluent Treatment Plant: Bangladesh Perspective
International Journal of Engineering Materials and Manufacture, 2022
The present study was undertaken to evaluate the performance efficiency of an Effluent Treatment Plant (ETP) of a Textile industry located at Tongi, Bangladesh with biological treatment (BT) and Membrane Bio-Reactor (MBR) with an average inflow of 300 m3/hr. The effluent samples were collected from the inlet and outlet of the ETP on a weekly basis for a 4 weeks’ period and were analysed for key parameters such as colour, temperature, total suspended solids (TSS), Total Dissolved Solids (TDS), pH, Dissolved Oxygen (DO), Biological Oxygen Demand (BOD), and Chemical Oxygen Demand (COD). In this study, it was observed that the colour of the effluent in the inlet was dark blue and after multiple unit treatments of the colour’s final outlet the discharge, water colour was very light purple. The temperature was varied from 32.2⁰C to 34.33⁰C. The TDS was varied from 1252.5 mg/l to 1087.5 mg/l and the percentage removal efficiency of TDS was varied from 21.47% to 42.7%. The TSS was varied fr...
Application of Bioremediation Process for Textile Wastewater Treatment Using Pilot Plant
2007
Textile industry is considered as one of the largest generators of toxic chemical wastewater in Malaysia. Textile industries consume large volumes of water and chemicals for wet processing. Considering both volume discharged and effluent composition, the wastewater generated by the textile industry is rated as the most polluting among all industrial sectors. The control of this wastewater has become of increasing importance in recent years. Tightening regulation coupled with increased enforcement is forcing textile industries to treat their waste effluent to an increasingly high standard. The aim of the project is to apply the developed wastewater bioremediation processes in a pilot integrated system for treatment of textile wastewater to achieve an effluent that meets the Malaysian emission standard and to obtain a process with small footprint, low chemical requirement, and minimal chemical sludge generation and with potential water reuse to achieve sustainable, cleaner production. The prototype treatment system consists of four major components which is the pretreatment process, bio-treatment process, polishing process and bio-sludge treatment process. Results showed that an average removal of 98% COD, 92% of color 98.8% of NH 3-N and 89% of TSS from the wastewater was achieved by the integrated prototype treatment system.
Alternative Method for Treatment of Wastewater in Textile industry : Review
International Journal of Scientific Research in Science and Technology, 2020
In the early days of industrial revolution the waste water generated was simply passed to water bodies like rivers, wells, etc. which was fine for that time as the amount of wastewater generated was very less. The process of dilution was the principle and water purification used to take place by surrounding environment of water called as self-purification of streams. But as soon as the more and more industries were established it was seen that the self-purification process fails to purify water because the quantity of wastewater flown in water bodies was much more than its capacity to purify it. Hence there was a need of effluent treatment plants. Textile industry creates a lot of wastewater having very high amount of color. The color present in water reduces its acceptability aesthetically. Also the color present in water hampers the process of photosynthesis for the plants and other photosynthetic species if directly discharged in water bodies. The textile wastewater also has very high pH, COD, BOD
Textile industries are the major contributor to environmental pollution and health hazards by generating huge amount of effluents that contain several pollutants and coloring agents. The concentration of these pollutants can be reduced to the permissible limit with the help of an Effluent Treatment Plant (ETP). The study was conducted to observe the textile effluent management techniques of an Effluent Treatment Plant (ETP) of Fakir Knitwear Limited (FKL), Narayanganj, Bangladesh. FKL set up a biological treatment plant to treat the effluent generated by the industry. Different effluent quality parameters were investigated at different stages in ETP. The effluent of the outlet was dark colored probably because of soluble coloring materials of the effluent but it is comparatively better than that of raw wastewater. There were found higher EC values than the standards which indicated that the greater amount of salts in the water due to dumping of solid wastes and discharging of industrial effluents. The highest TDS value 2054 ppm was observed at the screening pit unit than the other parts of the ETP. The highest DO was found 4.58 ppm in clarification tank which was within the standard value of aquaculture. The study also showed that the lowest BOD (24 ppm) and COD (145 ppm) was found at the outlet which was comparatively better than others. Although the effluent from the outlet contained pollutants, these effluent quality was comparatively good than the untreated waste water discharged from the industry. After treatment, the effluent of outlet moderately ensures the standard quality for aquaculture and irrigation. The results suggested that it is obvious to run the ETP regularly to improve the quality of effluents to save our native environment from the harmful effects of wastewater.
The study was conducted to investigate the effluent management techniques and physicochemical properties of effluents in different station of Effluent Treatment Plant (ETP) in Purbani Group during the period from December 2011 to June 2012. Nine water samples were collected from nine different points of the ETP in the Purbani Group. The results of the study revealed that the lowest temperature was found 33.4°c at the outlet. The highest pH was found 9.4 at the inlet and the lowest value was 6.8 at the neutralization tank. The highest DO was found 5.90 ppm at the oxidation tank and sedimentation feeding tank, while 4.1 ppm was found at the outlet. The highest EC was found 4171 µS/cm at the inlet of the ETP, where the lowest was found 1902 µS/cm at the sludge thickener. The study also showed that the lowest TDS (1132 ppm), BOD (23 ppm) and COD (95 ppm) was found at the outlet which was comparatively better than others. Although the effluent from the outlet contained pollutants, these effluent quality was comparatively good than the untreated waste water discharged from the industry.
Inventory and tertiary treatment of effluent from textile industries in Bangladesh
Dye effluent from textile industries is one of the most difficult types of wastewater to treat. There has been exhaustive research on the removal of dyes from textile wastewater by adsorption and coagulation-flocculation processes. This research is split up in two study parts. The first part shows an overview of the design and operation of the existing treatment facilities by the textile industries in Bangladesh. The second part of this study examines the removal efficiency of textile dyes at the tertiary level for the effluent of one textile industry, Masco Industries Ltd, deploying an integrated approach by an enhanced coagulation-flocculation method using a multispectral coagulant-flocculent called all poly floc (APF) and then, filtering the supernatant through a special media called activated filter media (AFM). The experiments were done batch wise in beakers and using a continuously operated column setup. The results obtained by the batch tests show that AFM has a very poor adsorbent capacity (0.88Pt.Co./gm) compared to traditional adsorbents used by the textile industries. A high removal efficiency was observed by the coagulation-flocculation process. When experimentally comparing the difference between APF and aluminium (as conventional coagulant), the APF was found very effective and much better than aluminium. The removal efficiency with APF was observed as 64%, while for aluminium, it was only 33%. As filter medium, tested in a column reactor, AFM was found ineffective to remove color from the feed wastewater and the supernatant after coagulation-flocculation. Moreover, this research investigated the removal efficiency of local sand against AFM filter medium, where the local sand shows better performance in order to filter out the remaining flocs from the supernatant (after coagulation-flocculation). The removal of flocs was achieved around 38% by the local sand (size: 0.13-0.25 mm), while around 19% was achieved by AFM grade-1 (size: 0.46-1.0 mm). Finally, this report includes the results obtained by a pilot study using a combination of APF and AFM at Masco Industries Ltd based on the optimum coagulant dosage (1ml/L) obtained by the batch tests and at a fixed flow rate (1m3/h). The result shows that the retention time given for flocculation inside a pressure tank was not enough to achieve the same removal as was observed for the column tests.