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Method for completely denitrifying wastewater with low carbon-nitrogen ratio

A technology with low carbon-to-nitrogen ratio and waste water, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve the problems of high operating costs, achieve the effects of improving processing capacity, occupying less land, and reducing power consumption

Inactive Publication Date: 2021-09-17
广东富成环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the traditional biological denitrification process in the prior art, such as high operating costs, and propose a method for complete denitrification of wastewater with a low carbon-to-nitrogen ratio

Method used

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  • Method for completely denitrifying wastewater with low carbon-nitrogen ratio

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Embodiment 1

[0021] refer to figure 1 , a method for complete denitrification of waste water with a low carbon-to-nitrogen ratio, comprising the steps of:

[0022] S1. Nitrification reaction, transport low carbon nitrogen ratio wastewater to short-range denitrification tank and short-range nitrification tank for reaction, control short-range denitrification DO=0mg / L and BOD=0, control short-range nitrification DO at 0.2mg / L , the short-range denitrification HRT is 30 minutes, the short-range nitrification HRT is 2 hours, and the reflux of short-range denitrification to short-range denitrification is adjusted to 2;

[0023] S2. Sludge-water separation, lift the sewage from short-range nitrification and short-range denitrification to the first mud-water separation system, and wait until the concentration of ammonia nitrogen in the water quality of the first mud-water separation system reaches 5 mg / L, and the concentration of nitrite nitrogen reaches 5 mg / L. And when SS=0mg / L and SDI=0 in th...

Embodiment 2

[0028] refer to figure 1 , a method for complete denitrification of waste water with a low carbon-to-nitrogen ratio, comprising the steps of:

[0029] S1, nitrification reaction, transport low carbon nitrogen ratio wastewater to short-range denitrification tank and short-range nitrification tank for reaction, control short-range denitrification DO=0.1mg / L and BOD=0, control short-range nitrification DO at 0.5mg / L In section L, the short-cut denitrification HRT is 45 minutes, the short-cut nitrification HRT is 37 hours, and the reflux from short-cut nitrification to short-cut denitrification is adjusted to 21 intervals;

[0030] S2. Sludge-water separation, elevating the sewage from short-range nitrification and short-range denitrification to the first mud-water separation system, until the concentration of ammonia nitrogen in the water quality of the first mud-water separation system reaches 547.5mg / L, and the concentration of nitrite nitrogen reaches 647.5mg / L L, when SS=0.5...

Embodiment 3

[0035] refer to figure 1 , a method for complete denitrification of waste water with a low carbon-to-nitrogen ratio, comprising the steps of:

[0036] S1. Nitrification reaction, transport low-carbon-to-nitrogen ratio wastewater to short-range denitrification tanks and react in short-range nitrification tanks, control short-range denitrification DO=0.2mg / L and BOD=0, control short-range nitrification DO at 0.8mg / L In section L, the short-cut denitrification HRT is 60 minutes, the short-cut nitrification HRT is 72 hours, and the reflux from short-cut nitrification to short-cut denitrification is adjusted to 40 intervals;

[0037] S2. Sludge-water separation, elevating the sewage from short-range nitrification and short-range denitrification to the first mud-water separation system, until the concentration of ammonia nitrogen in the water quality of the first mud-water separation system reaches 1100mg / L, and the concentration of nitrite nitrogen reaches 1300mg / L, And when SS=1m...

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Abstract

The invention relates to the technical field of sewage treatment, in particular to a method for completely denitrifying wastewater with a low carbon-nitrogen ratio. The method comprises the following steps: nitration reaction, mud-water separation, anaerobic ammonia oxidation, synergistic denitrification and secondary mud-water separation. BOD5 in the wastewater is comprehensively utilized, and is degraded by short-cut denitrification, so that the aim of first-step denitrification is fulfilled, and the alkalinity balance of the water body is kept, alkali is not needed or little alkali is added, and environmental protection and consumption reduction are achieved. Besides, an environment without BOD is provided for an anaerobic ammonia oxidation reactor, so that a stable condition is provided for ensuring the efficient denitrification of the AAOB; and clear liquid of the short-cut nitrification tank or the short-cut denitrification tank is introduced into the anaerobic ammonia oxidation reactor according to an adjustable proportion through a mud-water separation system, so that the normal denitrification capability of the AAOB is prevented from being interfered by other strains and TSS, it is ensured that the anaerobic ammonia oxidation reaction device effectively retains beneficial sludge, strains are enriched and propagated, and the problems of poor gas guide performance and the like of AAOB can be solved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for completely denitrifying waste water with a low carbon-to-nitrogen ratio. Background technique [0002] The main pollution sources in wastewater are COD (BOD5), ammonia nitrogen (total nitrogen), total phosphorus, and various heavy metals. So far, various traditional biological denitrification processes (such as A / O, A2O2, etc.) have high operating costs, Land occupation and investment costs are large, ammonia nitrogen and total ammonia cannot meet the emission standards, and the emission standards may still be raised. Contents of the invention [0003] The purpose of the present invention is to solve the disadvantages of the traditional biological denitrification process such as high operating cost in the prior art, and propose a method for complete denitrification of wastewater with a low carbon-to-nitrogen ratio. [0004] In order to achieve the above o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16C02F101/38
CPCC02F3/302C02F2101/16C02F2101/38C02F2301/043C02F2301/08
Inventor 杨光兴肖健
Owner 广东富成环境科技有限公司
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