Study of dysfunction into activated sludge basins in sewage treatment plant of the City of Khouribga (Morocco) (original) (raw)

Application of Activated Sludge for Urban Wastewater Treatment and Reuse for Irrigation in Kenitra, Morocco

The treatment domestic urban wastewater is growing nowadays, because of the rising cost of water and because of environmental pollution, and becoming an important water source for agricultural irrigation. The aim of this study was to decrease the biological oxygen demand (BOD5), chemical oxygen demand (COD) and total Suspended solids (SS) of urban wastewater the city of Kenitra by activated sludge, in first time focusing on determining the best activated sludge pilot plant operating conditions after in order to confirm the performance of the station, a long duration of the pilot purification test was conducted. The pilot operating conditions correspond in terms of mass load to a low load are: Flow 0.5l / h; Oxygenation rate 60%; 100% recycling of the activated sludge; Aeration tank agitation 100 rev/min. Also, a sustained performance during the trial period, during which, the station operated in low mass load, producing water with BOD5, COD and SS, which is respectively (90.20%, 89. 79% et 97.67%) much lower levels in Moroccan discharge standards. The final treated wastewater could be reused water for agricultural irrigation.

Microbiological aspects of the aeration tanks of an activated sludge treatment plant in dysfunction: Consequences on its treatment performance

Lebanese Science Journal

The present study was conducted in a sewage treatment plant, called "El Kouwaer", located in the department of Mascara, North-West of Algeria. Mainly, the objective of this investigation is to evaluate the relevant settling and pollution parameters and to assess the proliferation level of filamentous microbial communities during the dysfunction period to further the effectiveness of the operative treatment. Sludge parameter values were estimated such us Settling Test, Diluted Sludge Volume Index (DSVI), and Total Suspended Solids (TSS) content to set up the sludge classification, the performance analysis of treatment was conducted by computing pollution indicators and removal efficiencies of organic pollution, as well as the Principal Component Analysis (PCA) of dysfunction parameters. The results showed that in aeration tanks 65% of samples represented a maximum Filament Index (FI) of 6. Diluted Sludge Volume Index (DSVI) was greater than 300 mg/L in 23% of samples. A hig...

Municipal sewage wastewater treatment by activated sludge process: results of a pilot scale study

2019

The objective of the current research was to perform an experimental pilot study of municipal sewage wastewater treatment by activated sludge process. To this end, the biomass growth, system performance, flocs stealliabilityand microbial hygienic parameters were evaluated and assessed. The results highlight an optimal growth of the biomass, which reached 4.83±0.25 gTSS.l-1 and 3.68±0.2 gVSS.l-1. The activated sludge performances in term of TSS, COD, BOD5, TKN and TP were 92%, 94%, 97%, 85% and 16%, respectively. This value shows an efficient treatment of the wastewater organic pollution and nutrients by activated sludge pilot system. In addition, the treated effluent measured parameters concentrations were bellow Moroccan regulation for direct discharge into environment. The sludge volume index (SVI) average concentrations were in the range of 80 mL.g-1 to 150 mL.g-1, indicating the good folcs settleability during the experimental period. Concerning microbiological analysis, no sign...

Exploitation of the Domestic Wastewater Treatment Plant by Activated Sludge in the Airport Area of the City Ben Slimane (Morocco)

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2020

Domestic wastewater (toilet water and household water from kitchens) is evacuated in unit or separate networks to the purification station (STEP) in order to eliminate their waste; organic and mineral matter, dissolved and suspended before discharging them into the natural environment or reusing them in irrigation. The main purpose of this work is to operate the wastewater treatment plant in the Ben Slimane Airport area by using activated sludge, this process consists of destroying pollutants and microorganisms by bacteria formed in the clarifier. Moreover, the operation of the station was considered by controlling the sensors installed in each basin to promote their optimization, in addition, the physicochemical analysis was carried out in the STEP laboratory. The results found for the parameters studied showed the very effective reduction of the organic load of the wastewater treatment plant, so these values meet the discharge standards defined by Moroccan legislation.

Quality Assessment and Potential Reuse of Treated Wastewater by Activated Sludge (Sana'a city, Yemen) : Physico-Chemical Study

2016

The Sana'a Basin is located in central highlands of Yemen. This basin is characterized by water crisis due to arid climate with low rainfall (170 mm/year), and drawdown of piezometric levels. Promoting water reuse of treated wastewater for irrigation could mitigate this water crisis. This study assesses the performance of Wastewater Treatment Plant (WWTP) by activated sludge of Sana'a City by analyzing the quality raw and treated wastewater predominantly by domestic sewage. A comparison with Yemen and international guideline reveals the results of pH, EC and PO4 show that the effluent from SWWTP are in admissible standard limit for irrigation. But, the others parameters such as BOD, COD, NH4, TSS, phenols and heavy metals are very high than the standard values due to the overloaded of SWWTP. The added of facultative ponds can improve the performance of this station. Therefore, the quality of final effluent will be better.

Comparison of the Results from Microscopic Tests Concerning the Quality of Activated Sludge and Effluent

Water

Physicochemical studies on wastewater quality and microscopic analyses of activated sludge are necessary to properly evaluate the condition of activated sludge. The aim of this study was to evaluate the application of the sludge biotic index to determine when a change in treatment quality is short-lived, caused by, e.g., a change in influent quality or quantity, and when it indicates adverse changes in the biocenosis of activated sludge, which would very likely result in the lower efficiency of wastewater treatment in the near future. The objects of the study were two identical parallel running small wastewater treatment plants. The following indicators of contamination were analyzed: the chemical oxygen demand (COD), biochemical oxygen demand (BOD 5), and total suspended solids (TSS). The authors additionally carried out a microscopic analysis. The study confirmed a correlation between the sludge biotic index and the removal efficiency of COD and BOD 5 ; however, no correlation was found between the sludge biotic index and the removal efficiency of total suspended solids. The presence of metazoan microorganisms coincided in time with a good effluent treatment efficiency. When their quantity declined, a decrease in the efficiency of wastewater treatment was also observed.

Physicochemical and Microbiological Characterization of Sewage Sludge from Settat City’s Treatment Plant Domestic Waste Water (Morocco)

International journal of advanced research, 2017

In the present study, the physicochemical and microbiological characteristics of the potable water in the prefecture of Kozani are studied, according to the results of the analysis carried out in the Environmental Centre Laboratory, during 2002-2005. According to the Greek Legislation and the EU Directive for potable water, a water quality monitoring program was created for the County of Kozani, and the parameters of the Check and Audit Monitoring were examined for a number of samples from selected samples sites at regular intervals. Conclusions relative to the water adequacy of springs and drills, water tanks and supply network, as well as the possible reasons for water quality problems are presented in the study. Generally, the water quality depends on its chemical and microbiological condition. In the areas with penetrable formations and agricultural activity, the nitrates presence was observed in relatively stable concentrations in time. The water is easily infected during its transportation from the source to the internal water supply network and finally to the consumer. The condition of the water supply networks is a factor which contributes to the water quality.

Characteristics of sewage sludge produced from wastewater treatment plant in the Moroccan city Khouribga

2018

This study investigates the geotechnical characteristics, mineralogical properties and physicochemical properties of sewage sludge produced by wastewater treatment plant of the Khouribga city during the wastewater treatment process of chemical coagulation, biological and sedimentation. The main aim of this paper is to characterize the composition of sewage sludge and to assess compatibility with construction materials for reuse as an addition of sewage sludge in the manufacturing of construction materials. To characterize this sewage sludge many methods were used such as: the inductively coupled plasma atomic emission spectroscopy method, X-ray diffraction, Atterberg limits and the particle size distribution was determined by granulometry. The obtained results showed the physical properties of the sewage sludge materials. It consists of about 60% fine sand in grain size range 150-75 µm. Furthermore, it contains an important quantity of chemical components such as iron, calcium, silica, alumina and phosphate, while the main mineral constituents of sewage sludge are Al 2 O 3 , Fe 2 O 3 and SiO 2 . In addition, the results of the geotechnical characterization showed a very high value for a liquid limit of 315%, a plastic limit of 55% and the plasticity index of 260%. According to the classification of Casagrande, sewage sludge is similar behavior with of soils elastic, it is located in the group silts clays to high plasticity. Based on the physicochemical and geotechnical characterization and mineralogical composition of sewage sludge, it is indicated that sewage sludge has the potential to be utilized in various applications, such as in the manufactured brick, in the ceramic industry, into a cementitious material and in the making of cement is possible, because the main compounds of the sewage sludge is similar the properties of the raw material used in these materials.

Study of the Biological Treatment of Industrial Waste Water by the Activated Sludge Unit

2000

The activated sludge process simply involves bringing together wastewater and a mixed culture of microorganisms under aerobic conditions. The system usually includes a secondary treatment given to the settled sewage, and requires an environment in which active microorganisms are maintained in intimate contact with wastewater in the presence of sufficient oxygen. In this study, the treatment of industrial effluents, by

Characterization of sludge waste products from wastewater treatment plant of Khenifra city in Morocco

Environmental Research and Technology, 2019

To promote the utilization of sewage sludge as alternative building materials, a study was carried out to examine the characteristics of sewage sludge from wastewater treatment plant of khenifra city, Morocco. Experiments were performed for determining the mineralogical composition, chemical properties, loss of weight, the rate of the calcium carbonate and moisture. Furthermore, the geotechnical parameters deal with the Atterberg limits, water content and Sand equivalent of the sewage sludge material. The purpose of this paper is to present the available information on the various components of sewage sludge to explore the possibility of exploiting this waste in building materials Results show that sewage sludge has neutral pH value around 6.93 and contains organic matter. Moreover, the sludge is composed of a significant amount of oxides and metals. The value of net calorific value (NCV) is 1888.91 Kcal kg-1. As well as, the mineralogical composition of sludge has been determine...