Treatment device with bio-sludge degrading and denitrogenation, and its operating method

Abstract

The invention relates to a biological mud degrading and denitrogenating treating device and the operating method thereof, belonging to environmental protection field, especially relating to a device of strengthening predation of food chain of microbical ecosystem to degrade biological mud and denitrogenating in high performance and the operating method thereof, where the treating device comprises multistage contact oxidation tank, solid-liquid separation settling tank, and anaerobic hydrolyzing tank. And the peculiar propreties of spiral biological carriers in the multistage contact oxidation tank and the flexbilly controllable per-tank substrate concentration and oxygen supply conditions offer various microbes appropriate growth environments, thus composing an ecosystem with a food chain of bacilli, protozoans, metazoans, and senior micro animals. By the food chain, at the middle and rear stages of the multistage oxidation tank, higher microbes can largely prey on the residual mud with bacilli and other lower microbes as the main, thus largely reducing the residual mud.

Description

technical field [0001] The invention belongs to the field of using biological technology to treat sludge, and in particular relates to a device and an operation method for strengthening the predation action of the microbial ecosystem food chain to degrade biological sludge, and capable of efficiently decontaminating and denitrifying. Background technique [0002] Due to the simple process and mature technology of the activated sludge method, it has become a general method for urban sewage treatment, but the amount of sludge generated is large. The volume of sludge produced by an urban sewage treatment plant every day is 0.5% to 1.0% of the volume of sewage treatment. The cost is roughly equivalent to that of sewage treatment, and the investment in sludge treatment facilities also accounts for 30% to 40% of the total investment, or even more than 50%. [0003] According to statistics, the amount of sludge (dry weight) discharged by my country's urban sewage treatment plants ...

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Problems solved by technology

[0004] Although the sludge contains a large amount of organic matter and rich nitrogen, phosphorus and other substances, it has good economic and social benefits when used as agricultural fertilizer, but the sludge also contains pathogenic bacteria, parasite eggs and heavy metals that are harmful to plants and soil. Ions must be further processed to meet the requirements of my country's "Agricultural Sludge Pollutant Control Standards" (GB4284-84) before they can be used in agriculture.

[0005] Lack of land for landfill; sludge incineration cost is too high, and there is a lot of CO 2 Gas emissions, etc., making the final disposal of sludge more and more difficult

With physical methods (such as mechanical crushing) and chemical methods (such as ozone oxidation provided by Publication No. CN 1486941) and other means recently, the cell wall of the bacteria in the activated sludge is broken, and the organic matter in the cells overflows, and then flows back to the exposure. The method of biological treatment in the air tank has attracted attention, but there are problems such as troublesome operation and high cost

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