Fine processing technology of coal chemical aromatics-containing wastewater
A treatment process and technology of coal chemical industry, which is applied in the field of fine treatment process of aromatic hydrocarbon-containing wastewater in coal chemical industry, can solve the problems of high toxicity, difficult biochemical and high cost of aromatic hydrocarbon wastewater, achieve excellent demulsification effect, reduce load and reduce adsorption cost. Effect
Inactive Publication Date: 2016-06-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0004] The purpose of the present invention is to provide a kind of aromatics-containing coal chemical industry organically combined with air flotation, filtration, adsorption and membrane separation technology in order to solve the problems of high toxicity, difficult biochemical and high cost of existing treatment technology existing in the methanol-to-aromatics wastewater in the prior art. The fine treatment process of wastewater, which can effectively remove the organic matter in this type of wastewater, make the effluent meet the boiler water standard, and realize the recycling of water resources
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[0021] Such as figure 1 Shown, processing step of the present invention is as follows:
[0022] The wastewater advanced treatment process of the methanol-to-aromatics unit is the wastewater separated from the reaction unit. The water quality indicators are as follows: COD is 1549mg / L, SS is 0, hardness is 0, aromatics content (benzene, toluene, xylene) is 123mg / L L. Fatty acid content (acetic acid, propionic acid, butyric acid) is 267mg / L, oil content is 160mg / L.
[0023] In the first step, the wastewater discharged from the methanol-to-aromatics production line is imported into the adjustment tank for mixing. According to the characteristics of the production device, before the sewage is discharged, the oil, water and gas have been separated to remove most of the free oil. Therefore, the discharged wastewater The oil contained in it is emulsified oil, and it is necessary to add an appropriate amount of demulsifier for demulsification, which is beneficial to the subsequent ai...
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The invention relates to a fine processing technology of coal chemical aromatics-containing wastewater. The technical scheme comprises the following technological steps: (1) wastewater firstly enters an adjusting tank to be simply mixed, an inlet of the adjusting tank is provided with a dosing unit, and a demulsifier is added for demulsification, wherein the demulsifier is a p-tert-butyl phenolic polyether demulsifier; (2) sewage enters air floatation equipment through the adjusting tank to undergo air-floatation treatment; (3) an effluent from the air floatation equipment enters a filter unit to be filtered; (4) an effluent from the filter system enters adsorption equipment to be adsorbed; and (5) an effluent from the adsorption equipment undergoes deep treatment by a membrane separation technology, purified water obtained is used as boiler water or circulating cooling water, and a concentrated solution is sent to other equipment to be treated. The invention has the following beneficial effects: advantages of technologies such as air floatation, filtration, adsorption and membrane separation, etc. are combined, produced water from FMTA equipment is greatly treated, the effluent can reach index of boiler water, and the problem that the wastewater is hard to process is solved.
Description
technical field [0001] The invention relates to an advanced treatment process for wastewater from methanol-to-olefins process in coal chemical industry, in particular to a fine treatment process for aromatics-containing wastewater in coal chemical industry. The effluent can be used as boiler water and circulating cooling water. Background technique [0002] Wastewater from methanol to aromatics process is the wastewater produced during the reaction process of methanol, which contains a certain amount of oil, acidic substances and aromatics. Because of its high content of aromatics, it is highly toxic to microorganisms and difficult to biochemically treat. The current conventional sewage treatment process is difficult Effectively degrade the organic matter in it; however, this type of wastewater does not contain suspended matter and various inorganic ions, which reduces the cost of its treatment on the other hand. Using appropriate technology to remove the organic matter and ...
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Login to View More IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/001C02F1/24C02F1/283C02F1/40C02F1/441C02F2101/32C02F2103/36C02F2301/08
Inventor 刘新亮尹海亮蔺爱国郭子棋刘臻赵琳张菅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)