Self-control intermittent water inlet subsection aeration treatment system

Abstract

The invention belongs to the technical field of biological sewage treatment and relates to a self-control intermittent water inlet subsection aeration treatment system for sewage treatment. An I-segment aeration region, a II-segment sediment region and a III-segment aeration region are arranged adjacent to one another. A water inlet pipe connected with a water inlet pump provided with a time relay I is arranged in the I-segment aeration region. An I-segment air hose and a III-segment air hose are arranged in the I-segment aeration region and the III-segment aeration region respectively, wherein the I-segment air hose and the III-segment air hose are connected with an I-segment air blower and a III-segment air blower in a butt-joint and sealed mode respectively. The I-segment air blower and the III-segment air blower are provided with a time relay II and a time relay III respectively. A return sludge pipe embedded in the I-segment aeration region is communicated with a II-segment mud discharge pipe and a III-segment mud discharge pipe in series, wherein the II-segment mud discharge pipe and the III-segment mud discharge pipe are embedded in the II-segment sediment region and the III-segment aeration region respectively. A sludge discharge pipe embedded outside the III-segment aeration region is communicated with the II-segment mud discharge pipe and the III-segment mud discharge pipe in parallel. A water outlet pipe is arranged in the III-segment aeration region. The system is reasonable in design, scientific in principle, compact in structure, small in occupied area and low in investment cost.

Description

Technical field: [0001] The invention belongs to the technical field of sewage biological treatment, and specifically relates to a self-controlled intermittent water inlet segmental aeration system for sewage treatment, which can control the intermittent operation of the water inlet pump and the aerator through a time relay to realize different aeration areas. Aeration volume requirements, and through zone control treatment to achieve the removal of ammonia nitrogen from sewage. Background technique: [0002] Nitrogen is a very important pollution factor in the water environment, and its main forms in sewage are molecular nitrogen, organic nitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen, and sulfur cyanide and cyanide, etc. , the main forms of existence in untreated raw wastewater are organic nitrogen and ammonia nitrogen, and the main forms of existence in water after secondary biochemical treatment are ammonia nitrogen and nitrate nitrogen; in fresh domest...

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Problems solved by technology

[0004] The new biological denitrification process mainly refers to the short-range nitrification and denitrification (Sharon) process, simultaneous nitrification and denitrification (SND) and anaerobic ammonium oxidation (AMAMMOX), etc.; the short-range nitrification and denitrification process is mainly used to treat the secondary treatment system of urban sewage High-ammonia high-temperature wastewater such as sludge nitrification supernatant and garbage filtrate, but a large amount of urban sewage is low-temperature low-ammonia sewage. It is difficult to keep urban sewage at 30-35°C. Therefore, low-temperature low-ammonia How to achieve short-cut nitrification and denitrification of urban sewage needs further research; the OLAND process is a new biological denitrification process developed based on nitrous acid nitrification-anammox denitrification technology, which realizes nitrite denitrification under low oxygen concentration. However, the activated sludge in the suspension system is easy to disintegrate and expand filamentously under low oxygen, so low oxygen affects the settleability of activated sludge, sludge expansion, and the removal effect of pollutants other than nitrogen, so it is still Further research is needed; although the differences in the physiological mechanism and kinetic characteristics of nitrous bacteria and nitric acid bacteria can be used for control, due to the variability of microorganisms, the use of inhibitory pathways to achieve nitrous acid-type nitrification will inevitably lead to the adaptation of microorganisms to adverse environments , resulting in the inability of the system to withstand the impact load during the operation of the system, which may cause the system to fail. Therefore, how to effectively control and realize the accumulation of nitrite nitrogen, and the way to maintain it needs more in-depth research and exploration

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