Characterization Of Wastewater At Selected Sewage Plants In Harare, Zimbabwe
Characterization Of Wastewater At Selected Sewage Plants In Harare, Zimbabwe
Authors: R. Mazhandua, and Z. Hokob
ABSTRACT
One of the problems with most approaches in the selection of wastewater treatment systems is that the wastewater characteristics which are often estimated are assumed to remain constant through the design period of the plant. The change in standard of living, water availability and change of industrial activities are some factors that can significantly alter the wastewater characteristics and possibly affect its treatability with existing systems. This study was carried out from March to May 2009 to assess the treatability of sewage at two wastewater plants in Harare which are more than 20 years old.
Characteristics studied included pH, BOD, COD, TP, TS, TSS, TDS, TVSS, Ammonia and seven selected metals linked to bacterial toxicity. Composite samples were collected at the inlet works of Crowborough and Marlborough sewage treatment works and analyzed for the selected parameters according to standard methods. Crowborough which receives a mixture of domestic and industrial wastewater incorporates biological nutrient removal (BNR) and trickling filter (TF) processes. Marlborough Sewage Treatment Works, which treats only domestic wastewater, comprises a waste stabilization pond system. The ratios of key parameters were used to assess the treatability of the sewage including the potential to remove nutrients.
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A Review of Electrocoagulation Process for Wastewater Treatment
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Advanced Treatment Technologies For Recycle/Reuse Of Domestic Wastewater
Conventional wastewater treatment technologies improve the quality of wastewater discharged into the environment and restrain polluted waters from contaminating other available clean water resources. However, these treatment technologies do not make wastewater fit for further beneficial uses in communities closer to the points of generation. Innovative and advanced technologies that can further improve the quality of wastewater are needed to overcome this limitation of conventional technologies, and to promote widespread adoption of recycle and reuse practices. Advanced treatment processes can be biological processes, physicochemical processes, or a combination of both (hybrid processes). Biological processes to remove nutrient pollutants such as nitrogen and phosphorus, provide the platform for further wastewater treatment to reusable quality. Physicochemical processes such as deep-bed filtration, floating media filtration, and membrane filtration, play a major role among treatment technologies for water reuse. Membrane filtration has significant advantages over other processes since they produce high quality effluent that requires little or no disinfection with minimum sludge generation. The hybrid processes attempt to obtain the benefits of both biological and physicochemical processes in one step.
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Conventional wastewater treatment technologies improve the quality of wastewater discharged into the environment and restrain polluted waters from contaminating other available clean water resources. However, these treatment technologies do not make wastewater fit for further beneficial uses in communities closer to the points of generation. Innovative and advanced technologies that can further improve the quality of wastewater are needed to overcome this limitation of conventional technologies, and to promote widespread adoption of recycle and reuse practices. Advanced treatment processes can be biological processes, physicochemical processes, or a combination of both (hybrid processes). Biological processes to remove nutrient pollutants such as nitrogen and phosphorus, provide the platform for further wastewater treatment to reusable quality. Physicochemical processes such as deep-bed filtration, floating media filtration, and membrane filtration, play a major role among treatment technologies for water reuse. Membrane filtration has significant advantages over other processes since they produce high quality effluent that requires little or no disinfection with minimum sludge generation. The hybrid processes attempt to obtain the benefits of both biological and physicochemical processes in one step.
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The content of this technical sheet on “aerated ponds” is based primarily on the following publications:
“Aerated Pond”, compiled by Eawag (Swiss Federal Institute of Aquatic Science and Technology),
Dorothee Spuhler (international Gmbh) published on SSWM (http://www.sswm.info) (2015).
“Aerated, partial mix lagoons”, Technology Fact Sheet 832-F-02-008, published by U.S. EPA (2002).
“Principles of design and operations of wastewater treatment pond systems for plant operators,
engineers, and managers”, EPA/600/R-11/088, published by U.S. EPA (August 2011).
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The content of this technical sheet on “aerated ponds” is based primarily on the following publications:
“Aerated Pond”, compiled by Eawag (Swiss Federal Institute of Aquatic Science and Technology),
Dorothee Spuhler (international Gmbh) published on SSWM (http://www.sswm.info) (2015).
“Aerated, partial mix lagoons”, Technology Fact Sheet 832-F-02-008, published by U.S. EPA (2002).
“Principles of design and operations of wastewater treatment pond systems for plant operators,
engineers, and managers”, EPA/600/R-11/088, published by U.S. EPA (August 2011).
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Abstract:
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• List three potential impacts of odors.
• List three factors affecting the existence of odors.
• Name a commonly used method to reduce odors from wastewater.
• Describe three methods for solving odor problems in air.
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• Identify the source and general types of wastewater odors.
• List three potential impacts of odors.
• List three factors affecting the existence of odors.
• Name a commonly used method to reduce odors from wastewater.
• Describe three methods for solving odor problems in air.
Module 13: General Administration of Wastewater Treatment Plants
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.Describe methods for presenting plant data.
.Explain the frequency and types of reports utilized at a plant.
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Introduction
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A Simple Guide To The Chemistry, Selection And Use Of Chemicals For Water And Wastewater Treatment
Introduction
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