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A high-efficiency treatment method for high-concentration sewage from crushed coal pressurized gasification

A technology for pressurized gasification of crushed coal and sewage treatment method, which is applied in the directions of oxidized water/sewage treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. Meet the requirements of high-concentration sewage treatment and reuse of crushed coal pressurized gasification, and achieve the effects of improving COD removal rate, improving biodegradability, and shortening the process.

Active Publication Date: 2018-06-15
NJTECH ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, conventional wastewater treatment methods are difficult to meet the requirements of crushed coal pressurized gasification high-concentration wastewater treatment and reuse in terms of pertinence, treatment effect, and operation stability, and cannot meet the country's increasingly stringent environmental protection requirements. The prominent pollution problem has become a key constraint for the development of the industry, and it is urgent to develop a stable, efficient, and low-consumption crushed coal pressurized gasification high-concentration sewage treatment method

Method used

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  • A high-efficiency treatment method for high-concentration sewage from crushed coal pressurized gasification
  • A high-efficiency treatment method for high-concentration sewage from crushed coal pressurized gasification
  • A high-efficiency treatment method for high-concentration sewage from crushed coal pressurized gasification

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Effect test

Embodiment 1

[0035] The method of the present invention is applied to high-concentration sewage from coal gasification of a crushed coal pressurized gasifier in Inner Mongolia. The specific influent water quality is shown in Table 1. The implementation process of sewage treatment is carried out according to the following steps.

[0036] Step 1. After homogeneous adjustment, the high-concentration sewage enters the pretreatment unit for oil removal and turbidity removal, and a polymerization-promoting initiator is added to precipitate and remove slick oil, emulsified oil and heavy oil.

[0037] Step 2. Pretreat the effluent for oil and turbidity removal for enhanced oxidation, and selectively oxidize and remove toxic and refractory organic substances such as phenols, petroleum, and aromatic hydrocarbons in the sewage, reduce toxicity and improve biodegradability; specific methods can use existing technologies, For example, in ZL 200710131116.9, an enhanced oxidation process for organic toxi...

Embodiment 2

[0045] The high-concentration sewage of Henan crushed coal pressurized gasifier coal gasification, the specific influent water quality is shown in Table 2. The reaction steps are the same as in Example 1, and the specific reaction parameters are as follows.

[0046] In step 1, a polymerization-promoting initiator is added to realize the polymerization and sedimentation of the oily substance containing unsaturated bonds and the suspended matter in the wastewater. The concentration of the initiator is 0.2g / ton of wastewater, and the reaction time is 0.6h. The pretreated effluent flows into the split-flow two-stage anoxic / aerobic system, and the oxidized effluent flows into the two-stage A pools in different proportions. In step A, the operating pressure in the catalytic draft tube is 0.22Mpa, and the hydraulic retention time is 0.4h. In step B, the waste water flowing to the bottom of the catalytic oxidation tower is drawn out, and the reflux ratio is controlled to 300%. The s...

Embodiment 3

[0050] Xinjiang crushed coal pressurized gasifier coal gasification high-concentration sewage, see Table 3 for specific influent water quality. The reaction steps are the same as in Example 1, and the specific reaction parameters are as follows.

[0051] In step 1, a polymerization-promoting initiator is added to realize the polymerization and sedimentation of the oily substance containing unsaturated bonds and the suspended matter in the wastewater. The concentration of the initiator is 0.4g / ton of wastewater, and the reaction time is 1h. The pretreated effluent flows into the split-flow two-stage anoxic / aerobic system, and the oxidized effluent flows continuously into the two-stage A pools in different proportions. The ratio of the first-stage A pool to the second-stage A pool is 20:1. In step A, the operating pressure in the catalytic draft tube is 0.35Mpa, and the hydraulic retention time is 0.5h. In step B, the waste water flowing to the bottom of the catalytic oxidation...

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Abstract

The invention relates to a coal chemical industry sewage disposal method, and particularly relates to a high-efficient conny pressure gasification high-concentration sewage disposal method. Specific to the difficulty of treating the conny pressure gasification high-concentration sewage of a coal chemical industry, the invention aims to overcome the shortcomings existed in a traditional technique and provides a conny pressure gasification high-concentration sewage disposal method for triggering polymerization-promoting oil removal and turbidity removal, intensified oxidization, shunting type two-grade oxygen deficit / aerobiotic system, high-efficient low-consumption catalyst ozone oxidizing treatment coupling, and compact type biochemistry technical coupling with multiple novel high-efficient units. The method fully combines inherent characteristics of every unit, realizes the high-efficient removal of phenolic substance, oily substance, and heterocyclic ring type substance in waste water, fully displays the handling ability of the biochemical system, and stabilizes and promotes the effluent quality of the biochemical system. The whole method is featured by strong impact resistance, simple flow, low handling cost, and others; indexes of effluent COD, ammonia nitrogen, total nitrogen and specific pollutant are significantly better than the like waste water disposal level of the industry, and the method also has good popularization and application prospects.

Description

technical field [0001] The invention relates to a treatment method for coal chemical sewage, in particular to an efficient treatment method for high-concentration sewage by pressurized gasification of crushed coal. Background technique [0002] my country's energy endowment status of "rich in coal, poor in oil, and low in gas" and the objective needs of the national energy security strategy make the development of coal chemical industry a major change and an inevitable choice for the development of my country's chemical industry. Due to severe water shortage and fragile ecology in coal producing areas, "water shortage" and "water pollution" have become the "main bottleneck" restricting the development of the coal chemical industry. The most prominent problem facing the development of the industry. Among all kinds of coal chemical wastewater, the treatment of the refractory and high-concentration sewage of the crushed coal pressurized gasification furnace coal gasification i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/52C02F1/72C02F1/725C02F1/78C02F3/30C02F9/00
Inventor 徐炎华陆曦孙文全吕进朱明新沈丽娜
Owner NJTECH ENVIRONMENT TECH CO LTD
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