Nitrification and denitrification sewage treatment device and system

Abstract

The invention discloses an anaerobic-aerobic nitrification sewage treatment device which is characterized in that an anaerobic reaction zone is arranged at the center, an aerobic biomembrane nitrification reaction zone is arranged at the periphery, a sludge concentration A zone is arranged at the lower part of the aerobic biomembrane nitrification reaction zone, a supernatant liquid collecting A zone is arranged outside the upper part of the aerobic biomembrane nitrification reaction zone, and simultaneously, and a sludge rectifying A zone is additionally arranged between the anaerobic reaction zone and the aerobic biomembrane nitrification reaction zone. The invention also discloses an anaerobic-aerobic denitrification sewage treatment device which is characterized in that an aerobic reaction zone and an anaerobic reaction zone are respectively arranged at the upper part and the lower part of the center, a sludge rectifying B zone is arranged at the periphery, a sludge concentration B zone is arranged at the lower part of the sludge rectifying B zone, a supernatant liquid collecting B zone is arranged outside the upper part of the sludge rectifying B zone, and simultaneously, andan isolated drum B is additionally arranged in the sludge rectifying B zone so that an annular up-flow channel is formed between the isolated drum B and a cylindrical drum B. The invention also discloses a nitrification and denitrification sewage treatment system formed by sequentially connecting the two devices.

Description

technical field [0001] The invention relates to multistage treatment of sewage, in particular to multistage treatment of sewage with at least one physical treatment step. Background technique [0002] Existing biological sewage treatment methods mainly include adsorption-biodegradation method (AB method), anaerobic-aerobic method (AO method), anaerobic-anoxic-aerobic method (A 2 O method), oxidation ditch method and SBR sequencing batch activated sludge method, among them, SBR sequencing batch activated sludge method is a simple, fast and low-consumption sewage treatment process, which is very suitable for small and medium-sized enterprises with large changes in water quality and water volume Treatment of domestic sewage in cities and towns, and treatment of easily biodegradable industrial wastewater. However, this method still has the following problems to be solved in the process of biological nitrification, denitrification and phosphorus removal: 1. The difference in slu...

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Problems solved by technology

However, this method still has the following problems to be solved in the process of biological nitrification, denitrification and phosphorus removal: 1. The difference in sludge age between nitrifying bacteria and phosphorus accumulating bacteria; 2. Nitrification requires low organic matter concentration, and denitrification requires relatively low High organic matter concentration; 3. Nitrification requires high oxygen, and denitrification requires low oxygen; 4. The nitrification process provides nitrate for the denitrification process, but when the nitrification process itself has too much nitrate, it inhibits the nitrification process and makes the whole process impossible. Continue; 5. The nitrification process produces acid and consumes alkali, while the denitrification process produces alkali

As can be seen from the system described in the above patent application, it is obvious that it uses many equipment, the length of the process route and the large area occupied

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