An improved multi-stage a/o denitrification system with multi-stage water inlet

A staged water inlet and improved technology, applied in the direction of aerobic and anaerobic process treatment, to achieve the effect of reducing manual management and saving energy consumption

Active Publication Date: 2018-11-23
中科同恒环境科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the current situation in rural areas, the technical problem to be solved by the present invention is: how to provide a kind of sewage that can satisfy the efficient utilization of influent carbon sources, obtain better treatment effect, reduce the complexity of the process, and reduce the cost of operation and maintenance. Denitrification treatment method

Method used

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Examples

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Embodiment 1

[0020] In this example, the rural domestic sewage is taken as the research object, and the experimental research work is carried out on the biological denitrification technology of sub-influential water. The operating parameters of the process are: four-stage improved multi-stage A / O process with water inflow, the total effective volume of the reactor is 69L, and the COD of water inflow Cr =210mg / L, TKN=40mg / L, hydraulic retention time is 13h. According to the influent water quality, the value of a is 5, and the distribution of influent flow at all levels is calculated as: 38.6%, 27.6%, 19.7% and 14.1%, respectively, and the volume of each aerobic pool is calculated according to the principle of equal ammonia nitrogen volume load based on the distribution coefficient , the volume ratio of anoxic pool to aerobic pool is 1:1.

[0021] The reaction system is started by inoculating sludge to form a film. The inoculating sludge can be selected from the sludge in the secondary sedi...

Embodiment 2

[0024] This example is a demonstration project of domestic sewage treatment in a rural area, and its influent COD is actually measured Cr 200mg / L, NH 4 + -N is 25mg / L, and the average value of TN is about 30mg / L. It is required that the effluent TN≤12mg / L after treatment, and the four-stage improved segmented water inlet design is adopted, that is, "O / A / O / A / O / A / O" four-stage process, the value of a is 7, and the water flow distribution of each level is: 23.5%, 24.5%, 25.5%, and 26.5%.

Embodiment 3

[0026] A rural domestic sewage treatment demonstration project in Xiamen City adopts the "O / A / O improved segmented water inflow + ecological wetland" technology, and the influent COD Cr The average TN is 130mg / L, and the average TN is 30mg / L. The average removal rate of TN in the effluent is 60% after the improved staged influent denitrification treatment, and the effluent treated by the ecological wetland can stably reach the DB-35-322-1999 "Xiamen City Water Pollutants According to the first-level standard of the Emission Control Standard, the power consumption per ton of water in the facility is 0.2kwh, and the treatment cost per ton of water is 0.16 yuan. The equipment of the system is easy to operate, with low failure rate and low maintenance cost.

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Abstract

The invention solves the problems that in rural domestic sewage denitrification in the prior art, denitrification efficiency is low, operation and maintenance are complex and cost is high. A method includes the steps that domestic sewage enters a reactor from first-stage aerobic zones, a second-stage to N-stage anoxic or anaerobic zones, the anoxic or anaerobic zones and the first-stage aerobic zones are distributed at intervals, and accordingly backflow facilities in nitrification liquid of a system are reduced; the first section is modified to be an aerobic pool, and accordingly external backflow facilities are reduced. According to the principle that raw water organic carbon is used as denitrification carbon source to the largest extent, water inflow flow and the volume of the pool are distributed, the load of each stage is balanced, and the system is relatively stable. Filler is added into all anoxic or anaerobic pools and the aerobic pool, biological films are combined with the multi-section A / O denitrification process organically, and accordingly the method has the advantages of increasing biomass and bioactivity of the system, reducing excess sludge production, improving the purification capacity and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment and sewage resource utilization, and relates to a method for treating domestic sewage in villages and towns by adopting an improved segmented water inflow multi-stage A / O denitrification process. Background technique [0002] Nearly 90% of the country's total area is rural areas, and 96% of villages do not have sewage collection and treatment systems. Untreated domestic sewage is discharged through point sources and non-point sources, bringing various pollutants into the surrounding water bodies, seriously polluting various water sources, and becoming an important source of pollution affecting the quality of the water environment. [0003] Compared with urban domestic sewage, village and town domestic sewage has the characteristics of dispersion, large fluctuations in water quality and water volume, and imbalanced carbon and nitrogen ratios. At the same time, the economic cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 陈少华吴杰林向宇徐颖潘松青
Owner 中科同恒环境科技有限公司
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