scholarly journals Annual Variation in the Performance of Settat Wastewater Stabilization Ponds Located in Settat City, Morocco

2021 ◽  
Vol 22 (8) ◽  
pp. 153-164
Author(s):  
Abou-Tammame Dyaa ◽  
Fahti Jihane ◽  
Bouzidi Abdelhamid
Keyword(s):  
Annual Variation ◽  
Stabilization Ponds ◽  
Wastewater Stabilization Ponds

Nitrification in bulk water and biofilms of algae wastewater stabilization ponds

2007 ◽  
Vol 55 (11) ◽  
pp. 93-101 ◽  
Author(s):  
M.A. Babu ◽  
M.M. Mushi ◽  
N.P. van der Steen ◽  
C.M. Hooijmans ◽  
H.J. Gijzen
Keyword(s):  
Model Equation ◽  
Bulk Water ◽  
Balance Model ◽  
Nitrification Rate ◽  
Relative Contribution ◽  
Activity Test ◽  
Stabilization Ponds ◽  
Wide Range ◽  
Water Columns ◽  
Wastewater Stabilization Ponds

Nitrogen removal in wastewater stabilization ponds is poorly understood and effluent monitoring data show a wide range of differences in ammonium. For effluent discharge into the environment, low levels of nitrogen are recommended. Nitrification is limiting in facultative wastewater stabilization ponds. The reason why nitrification is considered to be limiting is attributed to low growth rate and wash out of the nitrifiers. Therefore to maintain a population, attached growth is required. The aim of this research is to study the relative contribution of bulk water and biofilms with respect to nitrification. The hypothesis is that nitrification can be enhanced in stabilization ponds by increasing the surface area for nitrifier attachment. In order to achieve this, transparent pond reactors representing water columns in algae WSP have been used. To discriminate between bulk and biofilm activity, 5-day batch activity tests were carried out with bulk water and biofilm sampled. The observed value for Rnitrbulk was 2.7 × 10−1 mg-N L−1 d−1 and for Rbiofilm was 1,495 mg-N m−2 d −1. During the 5 days of experiment with the biofilm, ammonia reduction was rapid on the first day. Therefore, a short-term biofilm activity test was performed to confirm this rapid decrease. Results revealed a nitrification rate, Rbiofilm, of 2,125 mg-N m−2 d−1 for the first 5 hours of the test, which is higher than the 1,495 mg-N m−2 d−1, observed on the first day of the 7-day biofilm activity test. Rbiofilm and Rnitrbulk values obtained in the batch activity tests were used as parameters in a mass balance model equation. The model was calibrated by adjusting the fraction of the pond volume and biofilm area that is active (i.e. aerobic). When assuming a depth of 0.08 m active upper layer, the model could describe well the measured effluent values for the pond reactors. The calibrated model was validated by predicting effluent Kjeldahl nitrogen of algae ponds in Palestine and Colombia. The model equation predicted well the effluent concentrations of ponds in Palestine.

Model of Daphnia populations for wastewater stabilization ponds

1995 ◽  
Vol 29 (1) ◽  
pp. 195-208 ◽  
Author(s):  
Charles J. Hathaway ◽  
Heinz G. Stefan
Keyword(s):  
Stabilization Ponds ◽  
Wastewater Stabilization Ponds

scholarly journals Changes in Bacterial Communities During Treatment of Municipal Wastewater in Arctic Wastewater Stabilization Ponds

2021 ◽  
Vol 3 ◽  
Author(s):  
Yannan Huang ◽  
Colin M. Ragush ◽  
Lindsay H. Johnston ◽  
Michael W. Hall ◽  
Robert G. Beiko ◽  
...  
Keyword(s):  
Water Quality ◽  
16S Rrna ◽  
Treatment Outcomes ◽  
Bacterial Communities ◽  
Municipal Wastewater ◽  
Quality Data ◽  
Water Quality Data ◽  
Stabilization Ponds ◽  
Wastewater Stabilization Ponds ◽  
Raw Wastewater

Wastewater stabilization ponds (WSPs) are commonly used to treat municipal wastewater in the Canadian Arctic. Bacterial community structure and functionality remain mostly uncharacterized for arctic WSPs, yet are presumed important for treatment outcomes during the 3-month summer treatment season with open water in the WSPs. The objective of this study was to investigate treatment performance and related temporal and spatial changes in the structure and putative function of bacterial communities during treatment of municipal wastewater in the WSPs of Pond Inlet and Clyde River, Nunavut over two consecutive summer treatment seasons. Influent raw wastewater contained a high organic load and large bacterial communities (~9 log 16S rRNA copies/mL) belonging mainly to Proteobacteria. Although designed to be facultative ponds, both WSPs remained anaerobic with neutral pH values (7.5–7.8) throughout the summer treatment season. Water quality data showed that nutrients [measured as carbonaceous biological oxygen demand (CBOD5)], total suspended solids, and total ammonia nitrogen were progressively reduced during treatment in the ponds as the summer progressed. The pond bacterial population size and species richness depended on the pond temperature (2–18°C), with 8.5 log 16S rRNA copies/mL and the largest alpha diversities (Shannon-Wiener index of 4-4.5) observed mid-season (late July). While the phylogenetic beta diversity in raw wastewater from the two locations remained similar, pond bacterial communities underwent significant (p < 0.05) changes to dominance of Comamonadaceae, Geobacteracea, and Porphyromonadaceae. Multivariate distance based redundancy analysis and predicted gene functionalities in the microbiota agreed with water quality results that microbial removal of nutrients (e.g., CBOD5) peaked in the middle of the summer coinciding with the treatment period with the highest pond temperatures. Information from this study will be useful for further development of models to predict biological treatment outcomes, which could be used to size and assess the feasibility of WSPs in extreme climates. Higher pond temperatures resulted in optimal biological processes and nutrient removal in the middle of the summer. While it is challenging to control environmental factors in a passive wastewater treatment system there are some design considerations that could be used to optimize temperature regimes, such as the depth of the pond.

Spectroscopic Indicators for Cytotoxicity of Chlorinated and Ozonated Effluents from Wastewater Stabilization Ponds and Activated Sludge

2018 ◽  
Vol 52 (5) ◽  
pp. 3167-3174 ◽  
Author(s):  
Nedal Massalha ◽  
Shengkun Dong ◽  
Michael J. Plewa ◽  
Mikhail Borisover ◽  
Thanh H. Nguyen
Keyword(s):  
Activated Sludge ◽  
Stabilization Ponds ◽  
Wastewater Stabilization Ponds

Evaluation of the Efficiency of Wastewater Treatment Plants in Taiz City and their Suitability for Irrigation

2020 ◽  
Vol 25 (1) ◽  
pp. 1-22
Author(s):  
Abdulatif A. Al-Munaifi ◽  
Soad A. Al-Sabban
Keyword(s):  
Biochemical Oxygen Demand ◽  
Fecal Coliform ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
International Standards ◽  
Treated Wastewater ◽  
Untreated Wastewater ◽  
Stabilization Ponds ◽  
New Treatment ◽  
Wastewater Stabilization Ponds

Abstract A field study was carried out for influent and effluent wastewater from Two treatment plants in Taiz city. The aim of the study is to evaluate and increase the efficiency of the treatment plants in Al-Buriahy and Nadfood factories (Al-Qurf), in order to ensure the safe and suitable use of wastewater for irrigation. Four samples of sewage were collected from influent and effluent of different locations within the areas of Al-Qurf, Al-Hawjlah, Hidran Al-Dabab and Al-Buraihy. The results of the chemical analysis showed that the samples of the partially treated wastewater compared with the untreated wastewater were higher in total dissolved solids. The values of the trace elements remained at the level of the sewage influent before and after the treatment plant in Al-Buraihy, the level of treatment did not decrease the concentration of a number of these elements. The results of the study indicate that the concentration of Biochemical Oxygen Demand (BOD5) for effluent wastewater from the treatment plants recorded a significant decrease in their values. In contrast the results were close in the concentration of the BOD5 influent from the treatment plant in Al-Buraihy with the BOD5 concentration effluent from the treatment plant in the Nadfood has, reached 457mg/l, because the influent of the sewage from the industrial processes in the treatment plant of the Nadfood was too high, reaching an average of 7791 mg / l compared with 553 mg / l in the municipal influent sewage at the treatment plant in Al-Buraihy. The results of bacteriological analyses showed that the treated wastewater recorded a significant reduction in the number of fecal coliform compared with the number of fecal coliform at influent from treatment plant at Al-Buraihy area.These indications for treatment in wastewater stabilization ponds in Al-Buraihy, and treatment  plant for industrial wastewater, that include the aeration and sedimentation units in Al-Qurf Nadfood factories, indicate that the degree of treatment is below the required level and still exceeds the limit allowed for irrigation purposes according to Yemeni and International standards. This suggests an action of rehabilitation of existing sewerage system, completion of the sewerage network and the establishment of the new treatment plant by using stabilization ponds with floating surface aerator in the facultative ponds at north of Taiz City. In addition, increase the efficiency of the current treatment plant by division of wastewater stabilization ponds in Al-Buraihy, into anaerobic, facultative and maturation ponds, providing each pond with two devices/tools to measure the flows, and the  establishment of the new treatment plant at the Nadfood factories. It should consist of screening, oil /fat removal, primary and secondary clarifiers, high rate trickling filters (1st and 2nd stage), sludge digester, sand drying beds, and chlorination. Keywords: Taiz city, sewage, biochemical oxygen demand, fecal coliform,treatment plant, efficiency, municipal, industrial.

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