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Carbon-nitrogen separated nitrogen removal process

A separation type, denitrification technology, applied in aerobic process treatment, special treatment targets, water/sludge/sewage treatment, etc., can solve problems such as different optimal conditions, unsatisfactory denitrification process, etc., to achieve improved treatment efficiency effect

Inactive Publication Date: 2017-11-24
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These three processes have different microorganisms and require different optimal conditions, so the existing denitrification process is not satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] This example is a municipal sewage treatment plant, which implements the first-level A standard (COD3 -N, the biochemistry of the effluent is poor and the C / N ratio is out of balance. Due to the requirement of emission reduction, the plant was required to raise the discharge standard, and the sewage should be treated to the surface water category V before discharge (COD<40, BOD<10, TN<2). From the perspective of indicators, COD and BOD are not a big problem, and the main difficulty is TN. The plant has selected a carbon and nitrogen separation type denitrification process, and its operation steps are as follows:

[0015] Step 1, inlet water adsorption: pump water into the zeolite pool for adsorption; since the concentration of ammonia nitrogen (i.e. total nitrogen) in the inlet water is low, the removal rate of zeolite adsorption is only about 70%, so this embodiment arranges secondary adsorption . After two-stage adsorption, the TN index is about 2. In this way, it n...

Embodiment 2

[0022] This example is feces and urine sewage (COD about 3800, BOD about 1600, TN about 900), the BOD / TN of this water is 1.7, the carbon-nitrogen ratio is out of balance, and an additional carbon source is required. However, the cost of external carbon source is high. Considering that COD / TN is 4.2, in order to make full use of its own carbon source, a carbon separation type denitrification process is selected. Before entering the system, the sewage undergoes anaerobic ammonification to ammonify all the total nitrogen into ammonia nitrogen. Subsequent steps to run are:

[0023] Step 1, inlet water adsorption: inject sewage into the zeolite pool for adsorption; due to the high concentration of ammonia nitrogen in the inlet water, the removal rate of zeolite adsorption is also very high, up to 89%, but because the concentration is too high, so this implementation For example, a secondary adsorption is arranged. After two adsorptions, the ammonia nitrogen is about 15, basicall...

Embodiment 3

[0030] This example is the filtrate after thermal hydrolysis of sludge (COD is about 50000, BOD is about 18500. TN is about 4000), the BOD / TN of this water is 4.6, and the carbon source is sufficient. However, due to the high nitrogen content, the anaerobic reaction is inhibited. However, such a high COD can only be removed by anaerobic method. In order to make the reaction go smoothly, a carbon and nitrogen separation type denitrification process is selected. Its operation steps are:

[0031] Step 1, inlet water adsorption: inject sewage into the zeolite pool for adsorption; due to the high concentration of ammonia nitrogen in the inlet water, the removal rate of zeolite adsorption is >90%, but considering the demand for ammonia nitrogen in subsequent biochemical reactions, the adsorption here Nitrogen is not intended for removal, but for the purpose of not inhibiting the anaerobic reaction. Through the control of the amount of zeolite, only half of the total nitrogen is ad...

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PUM

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Abstract

The invention discloses a carbon-nitrogen separated nitrogen removal process. The system is composed of a zeolite pool, a carbon pool, a nitrate pool and a purified water buffer pool. The process comprises the following steps: performing appropriate pretreatment on nitrogen-containing sewage, feeding the sewage into the zeolite pool to adsorb ammonia nitrogen in the sewage, and discharging the sewage in which carbon and nitrogen are separated into a carbon pool; performing aerated nitrification on zeolite for oxidizing ammonia nitrogen to be separated from the zeolite, thereby regenerating the zeolite, and discharging water containing nitrate nitrogen into the nitrate pool; then the sewage in the carbon pool and the nitrate pool is treated independently or in a combined manner by setting an appropriate treatment procedure outside the system, thereby removing nitrogen completely.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to a sewage denitrification treatment process. Background technique [0002] There are three main ways of sewage denitrification process: nitrification-denitrification (ie, aerobic nitrification-anoxic denitrification); aerobic nitrification-aerobic denitrification; anaerobic ammonium oxidation. Nitrification-denitrification is the easiest and most used denitrification process. [0003] In the existing nitrification-denitrification process, carbonaceous substances (COD) are treated first, and nitrogenous substances (NH 3 -N), and finally denitrification. These three processes have different microorganisms and require different optimal conditions. Therefore, the existing denitrification process is not satisfactory. If ammonia nitrogen and carbon-containing substances can be separated, three processes of carbon removal, nitrification, and denitrification can be carried out separately. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16
CPCC02F1/281C02F3/02C02F3/28C02F9/00C02F2101/16C02F2303/16
Inventor 张建中
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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