Evaluation and Performance of Activated Sludge Hi-Kleen Treatment Plant (ASHTP): A Case Study (original) (raw)
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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...
PERFORMANCE STUDY FOR TREATMENT OF INSTITUTIONAL WASTEWATER BY ACTIVATED SLUDGE PROCESS
Treatment of waste water involves a variety of methods. Biological treatment using aerobic activated sludge process has been in practice over a century. Conventional Activated Sludge Process (ASP) is the most common and oldest bio treatment process used to treat municipal and industrial wastewater. Typically wastewater after primary treatment i.e. suspended impurities removal is treated in an activated sludge process based biological treatment system comprising aeration tank followed by secondary clarifier. The aeration tank is a completely mixed bioreactor where specific concentration of biomass (measured as mixed liquor suspended solids (MLSS) is maintained along with sufficient dissolved oxygen (DO) concentration (typically 2 mg/l) to effect biodegradation of soluble organic impurities measured as biochemical oxygen demand (BOD 5 days). The Hydraulic Retention Time (HRT) is varied in the range 3-8 hrs. The maximum BOD removal efficiency obtained was 93.7% and turbidity removal efficiency was 87.6% in the 8 hrs HRT.
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.
Journal of Ecological Engineering
The paper presents information related to the use of hydrophytic technology combined with traditional activated sludge solution for wastewater treatment in areas without central sewage system. The analyzed wastewater treatment plant (WWTP) was operated in activated sludge technology with a hybrid activated sludge reactor where biomass is kept in a settled and suspended form. Treatment system was completed with a hydroponic lagoon. Hydroponic lagoon has been used as tertiary treatment, in which the self-cleaning processes with the participation of the plant has come to an additional reduction of nutrients. The analyzed three-stage treatment plant is located in the municipality of Nowa Sól. Only domestic wastewater delivered by slurry tanks is treated there in the amount of 60 m 3 /d. During the observation, high average concentrations of total nitrogen (201.0 mgN/dm 3) was observed and organic matter expressed by COD reaching 1341.5 mgO 2 /dm 3 and BOD 5 on the level of 246.3 mgO 2 /dm 3 were noted. A characteristic feature of the object designed for wastewater treatment delivered by slurry tanks is high irregularity of wastewater supply and high instantaneous loads of pollutants (the system does not provide expansion tank). The biggest inequality factor of the flow to the reactor was observed in December 2014 (Nd=3.9). During the observations days with no inflow of sewage also occurred. The study shows the dynamics of changes in the amount of delivered domestic wastewater and sewage flowing out of the treatment plant including inequality factor. Information about the quality of wastewater was used to determine the reduction of concentrations of pollutants such as organic matter, suspended solids, nitrogen and phosphorus.
Characterization of Sludge and Design of Activated Sludge Process for Sewage Treatment
2017
Activated sludge process is most common biological treatment. High efficiency and easy operation are advantages of the process. Characterization of the sewage is important aspect of the treatment methodology. The chemical and biological oxygen demand and their relative values help in deciding the treatment methodology. In the current work, the analysis of the sludge is carried out. Also the various important parameters like ultimate biological oxygen demand, rate constant and effect of temperature on the rate constant are studied. The activated sludge tank is designed and parameters such as hydraulic retention time, air requirement are estimated.
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.
Performance Evaluation of Abesan Wastewater Treatment Plant
2018
The performance of the Abesan wastewater treatment plant situated at the Abesan Low Cost Housing Estate, Abesan, Lagos had been evaluated. The treatment plant operates on biological treatment method (Activated Sludge Process) with an average wastewater inflow of 6 MLD has been considered for the case study. Thirty – six (36) grab samples of wastewater influent and effluent were collected over a period of six weeks during the dry and rainy seasons. The samples were analyzed for different wastewater quality variables. Average removal efficiencies of the measured parameters from the treated effluents were 96.3% for Chemical Oxygen Demand (COD), 93.3% for Biological Oxygen Demand (BOD), 92.4% for Total Suspended Solids (TSS), and 41.6% for Total Dissolved Solids (TDS) for the dry season. The rainy season average removal efficiency of the measured parameters were 96.8% for COD, 94.6% for BOD, 95.9% for TSS, and 38.6% for TDS. The values obtained for the dry season are lower than that obt...
Performance evaluation of different wastewater treatment technologies
The present study presents the evaluation of the performance efficiency of the wastewater treatment plants in El-Gharbia governorate in Egypt which hosts about 34 plants. These plants are designed and constructed to treat wastewater via removing organic matter, solids, nutrients, disease-causing organisms and other pollutants, before it reenters a non-fresh surface water bodies. In a preliminary study the performance efficiency of thirty different wastewater treatment plants (WWTPs) were evaluated. The investigated sewage treatment plants operating by biological treatment method comprising 5 different treatment technologies including conventional activated sludge, oxidation ditch, extended aeration, rotating biological contactors and aerated lagoons, with an average wastewater inflow of 10256.967 m 3 /day. Wastewater samples were collected at different sites of the treatment plants and analyzed for the major water quality parameters, such as biochemical oxygen demand (BOD), chemical oxygen demand (COD) and total suspended solids (TSS). The removal efficiency of each plant for TSS and BOD was calculated. This removal efficiency reflects the overall performance efficiency of each plant. The preliminary study revealed that Kotour WWTP, which operate with oxidation ditch technology exhibit the highest performance efficiency, while Tanta stage 2 WWTP which operate with conventional activated sludge technology exhibit the lowest one. The obtained results and recommendations are very much useful in identification and rectification of operational and maintenance problems as well as the future expansion to be carried out in the plants to meet the increased hydraulic and organic loadings.
Industrial Wastewater Treatment Using High Rate Activated Sludge and Alum Additive
International Journal of Environmental Science and Development, 2014
The high rate activated sludge stage of the multiple-stage sludge treatment plant is characterized by high efficiencies of treatment, cost, and size, compared to conventional activated sludge treatment plants. A pilot plant with an industrial discharge flow of 135L/h was designed according to the highly loaded activated sludge stage (A-stage). The plant simulated the biological and chemical treatment of sludge by adding alum to the aeration tank in dosages of 100, 150, 200 and 250 mg/L. The results clearly indicate that the highly-loaded activated sludge, the A-stage of the absorption/bio-oxidation system, has a high efficiency for the elimination of organic and inorganic matters. Without adding aluminum salt, the chemical oxygen demand, the total phosphate and the total nitrate were approximately 52.43%, 47.82%, and 40.09% respectively. The chemical-biological process with a dosage of 200mg/L alum resulted in 76.07% reduced chemical oxygen demand and improved efficiency of phosphate and nitrate removal to 73.5% and 66.98% respectively compared with the biological process in the A-stage.