Biological wastewater treatment and reuse using sulfur compounds as electron carriers to minimize sludge production

Abstract

The invention provides a biological sewage treatment method for influent water containing organic carbon. The method uses sulfur or sulfur compounds as electron carriers to oxidize organic carbon into carbon dioxide and simultaneously reduce sulfur or sulfur compounds to sulfides. The sulfides can be oxidized by oxygen or nitrates. If necessary, ammonia can be oxidized to nitrate and then reduced to nitrogen gas. The invention also provides a biological sewage treatment plant. The method is effective for both saline and non-saline wastewater plants.

Description

Background technique [0001] At the beginning of the 20th century, the discharge of organic pollutants made water pollution a major worldwide environmental problem, and the biological carbon removal process as a secondary treatment came into being. Although subsequent public health researchers have shifted their focus to the development of biological nutrient removal processes to solve the problem of eutrophication, and many competent authorities have also formulated guidelines and standards to control the discharge of nitrogen and phosphorus in sensitive water bodies, but they cannot The advantages of secondary treatment are thus overlooked. These advantages include shorter sludge ages, smaller reactors, easier handling and fewer foaming problems. [0002] The U.S. Environmental Protection Agency (USEPA) defined secondary treatment as the carbon biochemical oxygen demand (CBOD) of the 30-day average effluent in 1984. 5 ) and suspended solids (SS) are not higher than 25mg / L a...

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Problems solved by technology

[0007] However, it will be quite difficult to implement wastewater reuse systems in some areas (such as Hong Kong) where seawater is used for flushing toilets to save water

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