Device and method for treating sewage with low ratio of carbon to nitrogen

A technology with low carbon-to-nitrogen ratio and sewage, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as high cost and unsatisfactory total nitrogen removal effect, and achieve Achieve water quality requirements, good complementarity and operational flexibility, and high efficiency

Active Publication Date: 2012-07-25
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: In order to overcome the defects of high cost and unsatisfactory total nitrogen removal effect in the prior art, the present invention provides a device and method for treating sewage with low carbon-to-nitrogen ratio

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  • Device and method for treating sewage with low ratio of carbon to nitrogen
  • Device and method for treating sewage with low ratio of carbon to nitrogen
  • Device and method for treating sewage with low ratio of carbon to nitrogen

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Experimental program
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Effect test

Embodiment 1

[0028] The device for treating sewage with low carbon-to-nitrogen ratio, the schematic diagram of its structure is as follows figure 1 As shown, the biochemical treatment unit 1, lift pump 6, magnetic anion exchange resin treatment unit 7, contact filter unit 9, and disinfection unit 10 are sequentially connected in series through pipelines. The biochemical treatment unit consists of anaerobic tank 2, anoxic tank 3, The aerobic tank 4 and the secondary settling tank 5 are connected in series through pipelines. The end of the aerobic tank is provided with an internal return pipeline that returns to the anoxic tank, and the secondary settling tank is provided with an external return pipeline that returns to the anaerobic tank. The outlet of the secondary settling tank is for biochemical treatment The outlet of the unit, the magnetic anion exchange resin processing unit 7 includes magnetic anion exchange resin. It also includes a coagulant dosing device 8, which is connected to t...

Embodiment 2

[0030] Treatment of three batches of low carbon nitrogen ratio sewage:

[0031] (1) Biochemical treatment: Sewage with a low carbon-to-nitrogen ratio flows into the biochemical treatment unit, and enters the intermediate pipeline after being treated in the anaerobic tank, anoxic tank, aerobic tank, and secondary sedimentation tank; due to the relatively low carbon source content, the biochemical treatment unit The operating parameters adopt lower internal and external reflux ratios, which are 100% to 180% and 15% to 60% respectively, and the hydraulic retention times of anaerobic pools, anoxic pools, and aerobic pools are respectively set to 0.5 to 1h and 1.0 ~3.5, 6~10h;

[0032] (2) Ion exchange: The water in the middle pipeline enters the magnetic anion exchange resin treatment unit after being pressurized by the lift pump. The rate is controlled at about 150%; the effluent from the magnetic anion exchange resin treatment unit flows into the water inlet of the contact filt...

Embodiment 3

[0039] Regular A 2 O process + coagulation-sedimentation-filtration process to treat sewage with low carbon-to-nitrogen ratio:

[0040] (1) Biochemical treatment: Sewage with a low carbon-to-nitrogen ratio flows into the biochemical treatment unit, and enters the intermediate pipeline after being treated in the anaerobic tank, anoxic tank, aerobic tank, and secondary sedimentation tank; the operating parameters of the biochemical treatment unit are: internal and external The reflux ratio is 300% and 100% respectively, and the hydraulic retention time of the anaerobic pool, anoxic pool, and aerobic pool are set to 1.5h, 3.0, and 5.0h respectively;

[0041](2) Coagulation-sedimentation-filtration advanced treatment: the water in the middle pipeline is lifted into the coagulation unit. The coagulant is polyaluminum chloride, the dosage is 60mg / L, and it is mixed with a pipeline mixer; the flocculation tank is a folding plate flocculation tank, and the residence time is 15 minute...

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Abstract

The invention discloses a device and method for treating sewage with a low ratio of carbon to nitrogen. The device is formed by sequentially connecting a biochemical treatment unit, a magnetic anion exchange resin treatment unit, a contact filtering unit and a disinfecting unit by pipelines in series. According to the method for treating the sewage with the low ratio of the carbon to the nitrogen, the sewage with the low ratio of the carbon to the nitrogen is highly treated through steps of biochemical treatment, ion exchange, contact filtering, disinfection, discharge and the like. The device and the method for treating the sewage with the low ratio of the carbon to the nitrogen, disclosed by the invention, not only is low in technical cost and good in total nitrogen removing effect, but also remarkably strengthen an effect for removing organic matters and suspended matters so as to fully meet the requirement on water quality.

Description

technical field [0001] The invention relates to a device and method for treating sewage, in particular to a device and method for treating sewage with a low carbon-to-nitrogen ratio. Background technique [0002] There are many technological forms for denitrification and phosphorus removal of sewage at home and abroad, mainly including A / A / O, UCT, VIP, Bardenpho, SBR and oxidation ditch, etc., and the most basic principle is the classic theory of nitrogen and phosphorus removal. According to this theory, the removal of nitrogen and phosphorus depends largely on the available carbon source content in the raw sewage. However, at present, the carbon-to-nitrogen ratio in southern China and urban sewage with a large proportion of industrial wastewater is usually low (generally less than 5, even lower than 3), which is difficult to meet the demand for carbon sources in the process of nitrogen and phosphorus removal. [0003] Adding additional carbon sources is often used in produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 刘成陈卫张谦刘煜
Owner HOHAI UNIV
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