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A method of biological treatment and dephosphorization denitriding under the state of anaerobic-hypoxia

A conditional and biological technology is applied in the field of improving the effect of biological treatment under anaerobic-hypoxic conditions while removing phosphorus and nitrogen, achieving the effect of strong shock load resistance and stable operation effect.

Active Publication Date: 2008-04-16
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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So far, this method has not been reported in the literature

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  • A method of biological treatment and dephosphorization denitriding under the state of anaerobic-hypoxia

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Embodiment 1

[0016] Embodiment 1: Taking the tail water treatment of the aerated grit chamber as an example, the technical process is as follows: figure 1 shown. Influent water quality is COD Cr : 260mg / L (propionic acid is not added to the reactor), TN: 44mg / L, TP: 15mg / L. The water filling ratio of the SBR reactor is 0.785, and the influent flow rate is 11m 3 / d, the hydraulic retention time of sewage in the reaction tank is 7.6h, and the dissolved oxygen under low oxygen conditions is controlled at 0.45±0.20mg / L. The suspended solids concentration of the mixed liquor MLSS is 3200mg / L, the sludge age is 20d, the anaerobic time is 2h, and the treatment time under hypoxic conditions is 3h. The effluent results after running: CODcr=48mg / L, TN=20.44mg / L, TP=1.54mg / L, NH 4 + -N=0, the effluent quality does not meet the first-level discharge standard of the sewage treatment plant.

Embodiment 2

[0018] Sewage COD to be treated Cr Be 210mg / L, every liter of sewage propionic acid add-on is 34.2mg, make influent total COD identical with example 1 (being 260mg / L), all the other are with embodiment 1. Running results: CODcr=45mg / L, TN=19.65mg / L, TP=0.95mg / L, NH 4 + -N=0, the effluent quality meets the primary discharge standard of the sewage treatment plant.

Embodiment 3

[0020] Sewage COD to be treated Cr It is 150mg / L, and every liter of sewage propionic acid addition is 71mg, makes influent total COD identical with example 1 (being 260mg / L), all the other are with embodiment 1. Running results: CODcr=33mg / L, TN=16.76mg / L, TP=0.86mg / L, NH 4 + -N=0, the effluent quality meets the primary discharge standard of the sewage treatment plant.

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Abstract

The invention belongs to the novel environmental protection technical field, in particular to a method for improving simultaneously the phosphorus and nitrogen removal effect of microorganisms under anaerobic and hypoxia conditions. The method comprises the following steps that: propionic acid is added into the sewage to be treated, then the sewage is subject to biological treatment under anaerobic and hypoxia conditions (the dissolved oxygen is less than 1mg / L) to improve the phosphorus and nitrogen removal function of the system. When the invention operates with rational process parameter, a SBR reactor can reach the first level discharge standard of sewage treatment plant: CODcr is less than 50mg / L, TN is less than 20mg / L, NH4<+>-N is less than 5mg / L, and TP is less than 1mg / L.

Description

technical field [0001] The invention belongs to the technical field of biological treatment of water, waste water or sewage, and in particular relates to a method for improving the effect of simultaneous removal of phosphorus and nitrogen from biological treatment under anaerobic-hypoxic conditions. Background technique [0002] The removal of nitrogen and phosphorus in sewage is an important measure to prevent water eutrophication. The removal of nitrogen and phosphorus in sewage can be achieved through simultaneous nitrification and denitrification and anaerobic-aerobic enhanced biological phosphorus removal. In most studies, the dissolved oxygen in the aerobic phase was greater than 2mg / L. If the dissolved oxygen in the aerobic section of the anaerobic-aerobic biological phosphorus and nitrogen removal process can be controlled below 1mg / L, the power consumption of aeration in the sewage biological treatment process can be significantly reduced, and the purpose of low-en...

Claims

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Application Information

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IPC IPC(8): C02F3/28
Inventor 陈银广李洪静顾国维
Owner TONGJI UNIV