Urban sewage strengthening treatment method in cold area based on multi-point feed water adjustment

A technology for cold area and urban sewage, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The problem of high operating costs can save construction costs, reduce nitrate concentration, and increase residence time.

Inactive Publication Date: 2012-11-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the existing technology for treating urban sewage cannot simultaneously and efficiently remove nitrogen and phosphorus, the treatment effect is poor, the operating cost is high, and it is not suitable for treating urban sewage in cold regions. Intensified treatment method of urban sewage in cold regions with point-inflow regulation

Method used

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  • Urban sewage strengthening treatment method in cold area based on multi-point feed water adjustment

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specific Embodiment approach 1

[0023] Specific implementation mode one: combine figure 1 As shown, the enhanced treatment method for urban sewage in cold regions based on multi-point water inflow regulation in this embodiment is carried out in the following steps: 1. Preliminary sedimentation of sewage, with a hydraulic retention time of 0.5 to 1.0 h, and then the primary sedimentation tank is passed through the water distribution well. The effluent is divided into two or three parts for distribution; 2. The effluent mixture of the anaerobic tank and the anoxic tank 1 enters the aerobic tank at the same time as the 30% to 50% return sludge at the head end of the aerobic tank, and the hydraulic retention time is 4.0- 6.0h, the effluent from the aerobic tank enters the anoxic tank 2, the hydraulic retention time is 0.5-1.0h, the effluent from the anoxic tank 2 enters the secondary sedimentation tank for mud-water separation after falling water, the hydraulic retention time is 2.0-3.0h, and the dissolved oxygen...

specific Embodiment approach 2

[0033]Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the sewage is preliminarily precipitated, and the hydraulic retention time is 0.6-0.9 h. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0034] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step 1, the sewage undergoes preliminary precipitation, and the hydraulic retention time is 0.8h. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses an urban sewage strengthening treatment method in a cold area based on multi-point feed water adjustment, which relates to an urban sewage strengthening treatment method and solves the problems of incapability of synchronous and efficient denitrogenation and dephosphorization, poor treatment effect, high running cost and unsuitability for treating urban sewage in the cold area in the traditional technology of treating the urban sewage. The method comprises the following steps of: firstly, primary precipitation of sewage: dividing effluent of a primary settling tank into two parts or three parts through a distribution well for distribution; and secondly, synchronously introducing the effluent mixing liquid of an anaerobic tank and an anoxic tank 1 and the reflowing sludge at the head end of an aerobic tank into the aerobic tank, introducing the effluent of the aerobic tank into an anoxic tank 2, introducing the effluent of the anoxic tank 2 into a secondary settling tank through water drop, discharging a supernatant as treated purified water, reflowing a part of sludge at the lower layer, and discharging the rest as the remaining sludge. The invention can synchronously carry out efficient denitrogenation and dephosphorization, has favorable treatment effect and low running cost and is suitable for treating the urban sewage in the cold area.

Description

technical field [0001] The invention relates to a method for intensified treatment of urban sewage. Background technique [0002] At present, the urban sewage treatment mainly adopts the biological activated sludge method, and there are many kinds of treatment processes in the biological activated sludge method. 2 / O nitrogen and phosphorus removal process, oxidation ditch process, etc. A 2 / O process, as the simplest simultaneous nitrogen and phosphorus removal process in the system, is widely used in domestic and foreign urban sewage biological nitrogen and phosphorus removal sewage treatment plants due to its stable effect and wide adaptability. [0003] However, the process alternately operates three different environmental conditions of anaerobic, anoxic and aerobic, and different types of microbial flora such as phosphorus accumulating bacteria, denitrifying bacteria, and nitrifying bacteria coexist in the same sludge system, resulting in two major contradictions. ,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 赫俊国韩宝平刘剑
Owner HARBIN INST OF TECH
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