Macrophyte waste stabilization ponds: An option for municipal wastewater treatment

2012 ◽  
Vol 7 (30) ◽  
Author(s):  
Mumtaz Shah
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization

scholarly journals Improving the performance of waste stabilization ponds in an arid climate

2021 ◽  
Author(s):  
Badre Achag ◽  
Hind Mouhanni ◽  
Abdelaziz Bendou
Keyword(s):  
Wastewater Treatment ◽  
Retention Time ◽  
Municipal Wastewater ◽  
Poor Performance ◽  
Treatment Method ◽  
Fecal Coliforms ◽  
Arid Climate ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization

Abstract In many parts of the world, waste stabilization ponds (WSPs) are currently the preferred wastewater treatment method for municipal wastewater. The objective of this research is to examine the performance of a WSP in an arid climate region and to identify ways to improve its purification efficiency so that it can meet the criteria for reuse. The results attributed the poor performance to both improper process and physical design after 12 months of physicochemical and bacteriological analyses, as well as monitoring of operation, maintenance and loading rates. In tertiary treatment, maturation ponds are added, an increase in the capacity of the station, and management of the flow rate and retention time for each pond. By simulating the new WSP with GPS-X, the best pond area ratio obtained is 2.5 m2/capita, with a retention time of 4 days for anaerobic ponds, 20 days for facultative ponds and 3 days for two maturation ponds in series, which is suitable and provides reduction rates of BOD and fecal coliforms of 95 and 99%, respectively, with an average effluent concentration of 20 mg/L and 195 CFU. According to the results, well-maintained WSPs provide a viable, self-sufficient and environmentally friendly wastewater treatment solution for irrigation water supply in dry areas.

scholarly journals Monitoring microbial populations and antibiotic resistance gene enrichment associated with Arctic waste stabilization ponds

2021 ◽  
Author(s):  
Monica Gromala ◽  
Josh D. Neufeld ◽  
Brendan J. McConkey
Keyword(s):  
Antibiotic Resistance ◽  
Wastewater Treatment ◽  
Microbial Communities ◽  
Resistance Genes ◽  
Antibiotic Resistance Genes ◽  
The Arctic ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Baker Lake

Wastewater management in the Canadian Arctic is challenging due to climate extremes, small population sizes, and lack of conventional infrastructure for wastewater treatment. Although many Northern communities use waste stabilization ponds (WSPs) as their primary form of wastewater treatment, few studies have explored WSP microbial communities and assessed effluent impacts on receiving waters from a microbiological perspective. Here we used 16S rRNA gene and metagenome sequencing to characterize WSP and receiving water microbial communities for two time points bracketing the spring WSP thaw in Baker Lake (Nunavut) and compared these results to other Nunavut WSPs in Cambridge Bay and Kugluktuk. Most amplicon sequence variants (ASVs) recovered from these WSP samples belonged to the phylum Proteobacteria, with considerable variation between the three locations and only six ASVs shared among the WSPs at >0.2% relative abundance. Wastewater indicator ASVs for the Baker Lake WSP were identified and few indicator ASVs were detected in samples originating from other upstream or downstream sites. The metagenomic data revealed a strong enrichment of antibiotic resistance genes for WSP samples, relative to downstream and reference samples, especially for genes associated with macrolide resistance. Together our results provide a baseline characterization for WSP microbial communities, demonstrate how indicator ASVs can be used to monitor attenuation and dilution of effluent microorganisms, and reveal that WSPs can serve as hotspots for antibiotic resistance genes. Importance Given that the microbial communities of Arctic waste stabilization ponds (WSPs) are poorly studied to date, our characterization of multiple WSP systems and time points provides important baseline data that will assist with ongoing monitoring of effluent impacts on downstream aquatic ecosystems in the Arctic. This research also identifies indicator ASVs of WSPs that will be helpful for future monitoring for WSP effluent attenuation and demonstrates that WSP microbial communities are enriched in antibiotic resistance genes. Given operational and infrastructure changes anticipated for wastewater treatment systems in the Arctic, baseline data such as these are essential for further development of safe and effective wastewater treatment systems.

scholarly journals Model-Based Analysis of Increased Loads on the Performance of Activated Sludge and Waste Stabilization Ponds

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1410 ◽  
Author(s):  
Long Ho ◽  
Cassia Pompeu ◽  
Wout Van Echelpoel ◽  
Olivier Thas ◽  
Peter Goethals
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
In Silico ◽  
Peak Load ◽  
Waste Stabilization Ponds ◽  
Model Based ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Two Systems ◽  
Model Based Analysis

In a way to counter criticism on low cost-effective conventional activated sludge (AS) technology, waste stabilization ponds (WSPs) offer a valid alternative for wastewater treatment due to their simple and inexpensive operation. To evaluate this alternative with respect to its robustness and resilience capacity, we perform in silico experiments of different peak-load scenarios in two mathematical models representing the two systems. A systematic process of quality assurance for these virtual experiments is implemented, including sensitivity and identifiability analysis, with non-linear error propagation. Moreover, model calibration of a 210-day real experiment with 31 days of increased load was added to the evaluation. Generally speaking, increased-load scenarios run in silico showed that WSP systems are more resilient towards intermediate disturbances, hence, are suitable to treat not only municipal wastewater, but also industrial wastewater, such as poultry wastewater, and paperboard wastewater. However, when disturbances are extreme (over 7000 mg COD·L−1), the common design of the natural system fails to perform better than AS. Besides, the application of sensitivity analysis reveals the most influential parameters on the performance of the two systems. In the AS system, parameters related to autotrophic bacteria have the highest influence on the dynamics of particulate organic matter, while nitrogen removal is largely driven by nitrification and denitrification. Conversely, with an insignificant contribution of heterotrophs, the nutrient removal in the pond system is mostly done by algal assimilation. Furthermore, this systematic model-based analysis proved to be a suitable means for investigating the maximum load of wastewater treatment systems, and from that avoiding environmental problems and high economic costs for cleaning surface waters after severe overload events.

scholarly journals Enhancement of overloaded waste stabilization ponds using different pretreatment technologies: a comparative study from Namibia

2020 ◽  
Vol 10 (4) ◽  
pp. 500-512
Author(s):  
Jochen Sinn ◽  
Susanne Lackner
Keyword(s):  
Municipal Wastewater ◽  
Oxygen Demand ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Treatment Technology ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization ◽  
Sub Saharan ◽  
Anaerobic Sludge Blanket

Abstract Waste stabilization ponds (WSP) are a well-established wastewater treatment technology in Namibia. However, they are often overloaded and we still lack concepts and technologies for improvement. Therefore, this study presents the full-scale implementation of two pretreatment technologies to reduce the inflow of organic and solid loads into a facultative pond. We specifically compared the effects of anaerobic biological and mechanical pretreatment by an upstream anaerobic sludge blanket (UASB) reactor and a 250 μm micro sieve (MS). Not only in Namibia but also in most sub-Saharan countries, there is little experience with these technologies for the treatment of municipal wastewater in small and fast-growing local communities. Both technologies were tested in parallel for a period of 17 months and proved operational. While the UASB achieved better removal results with respect to chemical oxygen demand (COD) and suspended solids (TSS), the MS was more flexible in handling changing inflow patterns and had a much smaller footprint. The average total COD reductions of the MS and the UASB were 22 and 50%, respectively. TSS were removed by 45% with the MS and by 57% with the UASB reactor. Therefore, UASB and MS are viable options for the enhancement of existing WSP to reach better effluent values of the facultative pond.

Solar Enhanced Wastewater Treatment in Waste Stabilization Ponds

2009 ◽  
Vol 81 (5) ◽  
pp. 540-545 ◽  
Author(s):  
J. C. Agunwamba ◽  
J. T. Utsev ◽  
W. I. Okonkwo
Keyword(s):  
Wastewater Treatment ◽  
Waste Stabilization Ponds ◽  
Stabilization Ponds ◽  
Waste Stabilization
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