A deep denitrification process and device for domestic sewage without additional carbon source
A technology for domestic sewage and deep denitrification, which is applied in the field of water treatment to achieve the effects of reduced energy consumption for aeration, simple structure and easy management.
Inactive Publication Date: 2011-11-30
TONGJI UNIV
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Problems solved by technology
As a biological reaction, the anammox process widely exists in nature and some sewage biological treatment systems, but there are few reports on the purposeful application of anammox in artificial wetland treatment
Method used
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Embodiment 1： Embodiment or approach ，。 specific Embodiment approach
[0028] The treatment device includes: anaerobic acidification tank 21 , micro-aeration vertical flow constructed wetland 22 , horizontal subsurface flow constructed wetland 23 , sewage pump, aerator 5 , air flow meter 8 , wetland medium, and wetland plant calamus 17 . Among them, the anaerobic acidification tank 21 is made of transparent PVC board, the size of the hydrolysis tank is 0.55m×0.25m×0.7m, and the interior of the device is filled with about 50% of the volume and spherical suspension filler with a diameter of 80mm. The micro-aeration vertical flow artificial wetland 22 is a PVC cylinder with a diameter of 40cm and a height of 65cm. There is an aeration head at the bottom, and the inside is filled with 50mm gravels with a particle size of 20-30mm, 50mm gravel with a particle size of 10-15mm, and 450mm from bottom to top. Gravel with a particle size of 3-9mm. The size of the horizontal underflow constructed wetland 23 is 1.5m×0.4m×0.7m, and 550mm of gravel with a parti...
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Abstract
The present invention relates to a deep denitrification process and device for domestic sewage without additional carbon source. The present invention is a combination process composed of anaerobic acidification tank, micro-aeration vertical underflow wetland and horizontal underflow wetland. The specific process is as follows: The domestic sewage enters the anaerobic acidification tank; the effluent from the anaerobic tank enters the micro-aeration vertical subsurface flow wetland; the treated sewage from the micro-aeration vertical subsurface flow wetland enters the horizontal subsurface flow constructed wetland. The effluent from horizontal subsurface flow wetlands can be used to supplement static landscape water bodies and other purposes. The present invention controls the ratio of NH4+-N/NO3--N in the horizontal subsurface flow wetland influent to 1-1.4:1 through the adjustment of appropriate process parameters, and the actual BOD5/N is far lower than the theoretical value of denitrification BOD5/N Under these conditions, anaerobic ammonium oxidation can be stably realized in constructed wetlands, forming a low-cost, high-removal sewage deep denitrification process. Micro-aeration vertical flow wetlands + horizontal subsurface flow wetlands can be applied to sewage treatment plants. Advanced water treatment can also be used for decentralized domestic sewage treatment. The invention has the advantages of simple structure, low cost and convenient operation and maintenance, and can achieve a TN removal rate of over 95%, stable pollutant removal effect, and effluent water quality up to Class IV standard of surface water.
Description
technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a deep denitrification process and device for domestic sewage without additional carbon source. Background technique [0002] Constructed wetlands (Constructed Wetlands, CWs) is a sewage ecological treatment technology developed in the early 1950s. With high biological safety and environmental compatibility, it has been widely used in decentralized domestic sewage treatment and secondary treatment effluent advanced treatment of sewage plants. [0003] The advanced treatment of sewage is used as a supplementary water source for landscape water bodies or municipal water, which has become an effective measure to solve the shortage of water resources. As a supplementary water source for landscape water bodies, there are strict control requirements for nutrients such as nitrogen and phosphorus. Constructed wetland is a natural treatment system, which has disadvantages such...
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IPC IPC(8): C02F9/14C02F3/28C02F3/32
CPCY02W10/10
Inventor 李田王玲
Owner TONGJI UNIV
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