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Low carbon source urban sewage strengthening denitrogenation dephosphorization technique and device

A technology for nitrogen and phosphorus removal of urban sewage, applied in water/sewage treatment, biological water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of loss of biological phosphorus removal ability, increase in chemical dosage, and operating costs Improvement and other problems to achieve the effect of solving insufficient phosphorus removal capacity, reducing dosage, and reducing operating costs

Inactive Publication Date: 2008-09-17
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Leading to the loss of the system's biological phosphorus removal ability, the increase of chemical dosage, the increase of operating costs, the large area occupied, and the high operating costs

Method used

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  • Low carbon source urban sewage strengthening denitrogenation dephosphorization technique and device
  • Low carbon source urban sewage strengthening denitrogenation dephosphorization technique and device

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] Adopt the bio-chemical combined sewage treatment test device of the present invention to treat sewage plant sewage, the treatment scale is 2.6 cubic meters per day, and the water quality condition of sewage plant grit chamber effluent is: influent CODcr: 125~373mg / L, TP (total Phosphorus): 4.52~7.11mg / L, TN (total nitrogen): 45~70mg / L. Adopting the enhanced denitrification and dephosphorization process of the present invention has a sludge age of 5 days, a hydraulic retention time of 4 hours in the aerobic zone, a sludge reflux ratio of 200%, and a Fe (phosphorus removal chemical agent adopts FeCl3):P molar ratio of 0.8:1 Under operating conditions, effluent CODcr: 29-53mg / L, TP: 0.51-0.74mg / L, TN: 14-19mg / L, reaching the first-class B discharge standard of the national "Urban Sewage Treatment Plant Pollutant Discharge Standard". To achieve the same nitrogen and phosphorus removal effect, the Fe:P of the general chemical-assisted phosphorus removal process is generally ...

Embodiment 2

[0019] The biological-chemical combined sewage treatment test device of the present invention is used to process the domestic sewage of the student apartment, the treatment scale is 2.6 cubic meters per day, and the domestic sewage influent CODcr: 144~305mg / L, TP: 3.18~5.52mg / L, TN: Under the water quality condition of 30~56mg / L, adopt the enhanced denitrification and dephosphorization process of the present invention in sludge age 5 days, hydraulic retention time in aerobic zone 4 hours, sludge reflux ratio 200%, Fe (phosphorus removal chemical The medicament adopts FeCl3):P molar ratio 1.1:1 under the operating condition, the effluent CODcr: 20-47mg / L, TP: 0.38-0.64mg / L, TN: 15-20mg / L, reaching the national "Urban Sewage Treatment Plant Pollutants Emission standard "Class B emission standard.

Embodiment 3

[0021] Using the biological-chemical combined sewage treatment test device of the present invention to treat urban sewage, the treatment scale is 2.6 cubic meters per day, CODcr: 164-275mg / L, TP: 2.18-6.25mg / L, TN: Under the water quality condition of 40~68mg / L, adopt the enhanced denitrification and dephosphorization process of the present invention in sludge age 5 days, hydraulic retention time in aerobic zone 4 hours, sludge reflux ratio 200%, Fe (phosphorus removal chemical agent adopts Under the operating condition of FeCl3):P molar ratio 1.04:1, effluent CODcr: 25-45mg / L, TP: 0.43-0.77mg / L, TN: 10-17mg / L, which meet the national "Urban Sewage Treatment Plant Pollutant Discharge Standard" 》Tier 1 B emission standard.

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Abstract

The invention provides an enhanced low-carbon source urban sewage denitrogenation and phosphorous removal process, and a biological-chemical combined sewage treatment device for realizing the process. The enhanced denitrogenation and phosphorous removal process comprises the steps of adding suspended filler in a biochemical reaction tank to increase microbial biomass, and at the same time adding phosphorous removal chemical agent at the end of the biochemical reaction tank. The biological-chemical combined sewage treatment device comprises a biochemical reaction tank and a chemical agent adding device, wherein the biochemical reaction tank is partitioned into an anoxic tank, an anaerobic tank and an aerobic tank that are connected in series; the anoxic tank and the anaerobic tank are respectively provided with a stirring paddle , and a water inlet pipe and a sludge return pipe are arranged at the side face of the anoxic tank; the aerobic tank is filled with 25-35% (v / v) suspended filler of the volume of the aerobic tank, an aeration pipe connected with an air inlet pipe is arranged at the bottom of the aerobic tank, and a water outlet pipe is arranged in the upper part of the aerobic tank; and the chemical agent adding device comprises a chemical agent tank, a metering pump and a chemical agent adding pipe that are sequentially connected, and the chemical agent adding pipe is connected with the aerobic tank.

Description

technical field [0001] The invention relates to a chemical / biological coupling denitrification and phosphorus removal treatment process and device for low-carbon source urban sewage treatment, and belongs to the technical field of urban sewage treatment. Background technique [0002] Nitrogen and phosphorus carried by urban sewage will cause eutrophication of lakes, rivers and marine environments after being discharged into water bodies, resulting in large-scale red tides or frequent algal blooms. In order to prevent the eutrophication of nitrogen and phosphorus on the receiving water body, at present, the process of phosphorus and nitrogen removal in sewage is mainly divided into two categories: biological method and chemical method. Compared with chemical nitrogen and phosphorus removal, biological nitrogen and phosphorus removal process is a hot spot in research and engineering application in recent years. [0003] In the design of urban sewage treatment systems with bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/10C02F1/58C02F3/30
CPCY02W10/10
Inventor 张志斌张波边兴玉康兴生张成禄张建武道吉张学杨
Owner SHANDONG JIANZHU UNIV
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