Water Recycling Treatment Process

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2.0 Water Recycling Treatment Process The water recycling process involves basic physical, biological and chemical principles to remove contaminants from water. The water recycling treatment process actually involves three stages, that is primary treatment, secondary treatment and tertiary treatment. Diagram 1 shows the water recycling process. Diagram 1 Primary Treatment Primary treatment uses simple mechanical and physical processes to remove approximately half of the contaminants from wastewater. Bar screens: First, the incoming raw sewage is routed through mechanical bar screens, removing large solids such as sticks, rags, and plastic material from the wastewater stream. A horizontal rake on a toothed gear drive rakes the bars…show more content…
Biosolids removed at this point are digested, dewatered, and used for other purposes. Secondary Treatment Secondary treatment uses biological processes to remove most of the remaining contaminants. Aeration Basins: After that, water flows into aeration basins where the water is mixes with oxygen. Bacterial microorganisms consume the organic material as food. The non-settleable solids will be convert to settleable solids and are later themselves captured in final clarifiers, ending up in wastewater biosolids. Final Clarifiers: Most of the solids that settle out in final clarifiers are thickened and digested, but some are returned to the aeration tank to reseed incoming water with hungry microorganisms. Tertiary Treatment In tertiary treatment, water is filtered through sand before undergoing chemical disinfection in chlorine contact chambers, used to kill any remaining microorganisms. It is not desirable to have residual chlorine in the rivers and lakes, so chlorine is then removed using sulfur dioxide. This helps to protect the aquatic life in the receiving stream or…show more content…
In Germany, the reuse of recycled water as mixing water for concrete is a common practice in almost all ready-mixed concrete plants. The disposal of such wastewater is no longer being environmentally accepted. The recycled water consists primarily of the mixture of water, cement, and fines that remain after removal of the aggregate, but it also includes the wash water used for washing and cleaning the returning mixer trucks, concrete pumps, and other equipment, as well as the precipitation water collected on the production areas. Overall, it was found that concretes made with recycled water shows the similar properties as concretes made with drinking water or fresh water

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