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A combined process coupling aerobic biochemical treatment, ozone catalytic oxidation and biological denitrogenation for acrylonitrile wastewater

An ozone catalytic oxidation, aerobic biochemical technology, applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Nitrogen ratio imbalance and other problems, to achieve the effect of reducing chemical consumption, large amount of activated sludge, and reducing dosing

Inactive Publication Date: 2016-06-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] 1. The CODcr of acrylonitrile sewage is relatively high. As the service life of the acrylonitrile catalyst increases, the CODcr value of the discharged sewage will increase year by year. After three years of catalyst replacement, the average COD is above 2000mg / L. It is very difficult to pass the general treatment process. It is difficult to meet the first-level emission standard
[0020] 2. Poor biodegradability, generally B / C<0.3, and because the influent COD is too high, the water contains some refractory organic matter and cyanide (cyanide ≤ 3mg / L), biochemical treatment alone cannot treat refractory organic matter is degraded
[0021] 3. The total nitrogen content is high, and the carbon-nitrogen ratio is seriously unbalanced
[0023] To sum up the above four points, the treatment of acrylonitrile sewage is carried out through biochemical treatment alone, advanced oxidation or a combination of the two processes, which can achieve partial treatment effects on CODcr and ammonia nitrogen. In engineering practice, only 9 companies in the country have acrylonitrile equipment Among the chemical enterprises in the world, none of the treated effluent can reach the first-level standard of CODcr≤60mg / L and ammonia nitrogen≤15mg / L "Integrated Wastewater Discharge Standard" (GB8978-1996)

Method used

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  • A combined process coupling aerobic biochemical treatment, ozone catalytic oxidation and biological denitrogenation for acrylonitrile wastewater
  • A combined process coupling aerobic biochemical treatment, ozone catalytic oxidation and biological denitrogenation for acrylonitrile wastewater
  • A combined process coupling aerobic biochemical treatment, ozone catalytic oxidation and biological denitrogenation for acrylonitrile wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1: Acrylonitrile incoming water (COD: 1014mg / l, ammonia nitrogen: 108mg / l) is upgraded to the aerobic biochemical system by the 1# regulating tank lifting pump. The aerobic biochemical system adopts low dissolved oxygen and high ratio of reflux. In the oxygen biochemical process, the dissolved oxygen is controlled at 1.5mg / l, the sludge concentration is controlled at 2g / l, the reflux ratio is controlled at 75%, and the aerobic biochemical system effluent (COD: 284mg / l, ammonia nitrogen: 141mg / l) flows to Intermediate pool, the effluent of the intermediate pool is pumped to the multi-media filter, the effluent of the multi-media filter flows to the ozone catalytic oxidation tower by itself, the effluent from the oxidation tower (COD: 149mg / l) flows to the stabilization pool by itself, and the effluent of the stabilization pool is pumped to denitrification In the denitrification tank, the dissolved oxygen in the anoxic section is controlled at 0.2mg / l, and the efflu...

Embodiment 2

[0077] Example 2: Acrylonitrile incoming water (COD: 1514mg / l, ammonia nitrogen: 167mg / l) is upgraded to the aerobic biochemical system by the 1# regulating tank lifting pump. The aerobic biochemical system adopts low dissolved oxygen and high ratio of reflux. Oxygen biochemical process, the dissolved oxygen is controlled at 2.5mg / l, the sludge concentration is controlled at 3.5g / l, the reflux ratio is controlled at 80%, and the aerobic biochemical system effluent (COD: 241mg / l, ammonia nitrogen: 36.2mg / l) The effluent from the intermediate pool is pumped to the multi-media filter. The effluent from the multi-media filter flows to the ozone catalytic oxidation tower. The effluent from the oxidation tower (COD: 144mg / l) flows to the stabilization pool. The effluent of the stabilization pool is raised to Denitrification tank, the oxygen in the anoxic section of the denitrification tank is controlled at 0.35mg / l, the effluent from the denitrification tank (COD: 53mg / l, ammonia nitr...

Embodiment 3

[0078] Example 3: Acrylonitrile incoming water (COD: 1602mg / l, ammonia nitrogen: 212mg / l) is upgraded to the aerobic biochemical system by the 1# regulating tank lifting pump. The aerobic biochemical system adopts low dissolved oxygen and high ratio of reflux. Oxygen biochemical process, the dissolved oxygen is controlled at 3.5mg / l, the sludge concentration is controlled at 5g / l, the reflux ratio is controlled at 85%, the aerobic biochemical system effluent (COD: 226mg / l, ammonia nitrogen: 6.38mg / l) is self-flowing To the intermediate pool, the effluent of the intermediate pool is lifted to the multi-media filter with a pump, the effluent from the multi-media filter flows to the ozone catalytic oxidation tower by itself, the effluent from the oxidation tower (COD: 142mg / l) flows to the stabilization pool, and the effluent from the stabilization pool is lifted to the dewatering Nitrogen tank and denitrification tank control the dissolved oxygen in the anoxic section at 0.6mg / l, ...

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PUM

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Abstract

A combined process coupling aerobic biochemical treatment, ozone catalytic oxidation and biological denitrogenation for acrylonitrile wastewater is disclosed. The combined process comprises an aerobic biochemical process, an ozone catalytic oxidation process and a biological denitrogenation process. Discharged water subjected to aerobic biochemical process treatment in an aerobic biochemical unit is led into an ozone catalytic oxidation unit. Ozone catalytic oxidation process treatment is performed in the ozone catalytic oxidation unit, and discharged water after the ozone catalytic oxidation process treatment is led into a biological denitrogenation system and subjected to biological denitrogenation process treatment.

Description

Technical field [0001] The invention relates to a combined treatment process of high-concentration sewage containing acrylonitrile and its by-products (hereinafter referred to as acrylonitrile sewage) discharged during the production of acrylonitrile. Background technique [0002] Acrylonitrile is the main raw material in the production of chemical products such as acrylamide and acrylic fiber. Acrylonitrile wastewater has high pollutant concentration and complex water quality components, which are the main sources of water pollutants in chemical companies. At present, domestic acrylonitrile plants are generally equipped with acrylonitrile, acrylamide and other equipment, and the supporting sewage treatment plant treats the mixed water of acrylonitrile and its downstream sewage. With the continuous improvement of water-saving and emission-reduction requirements in recent years, downstream devices such as acrylic fiber and acrylamide have successively adopted recovery measures su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
Inventor 万志强杨清华姜国骅徐波苏庆峰陈忠英马济美张中武
Owner PETROCHINA CO LTD
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