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A comprehensive treatment and zero-discharge treatment method and system for refractory organic wastewater

An organic wastewater, comprehensive treatment technology, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as failure to meet national discharge standards, outdated process technology, refractory residues, etc., to improve fresh water. Productivity, pollution reduction, and low consumption of chemicals

Active Publication Date: 2019-01-22
徐州赛科康仑智能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the particularity of the wastewater, it is difficult to effectively remove it by using "conventional" methods such as biological methods or physical and chemical methods alone. From the current actual operation situation, although many factories have built sewage treatment facilities, due to the outdated and limited technology , Refractory organic matter often remains in the effluent, which makes it unable to meet the national discharge standards, let alone achieve zero discharge

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  • A comprehensive treatment and zero-discharge treatment method and system for refractory organic wastewater

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Embodiment 1

[0034] Take the wastewater treatment of a coal chemical plant as an example.

[0035] Coal chemical industry wastewater contains high concentrations of refractory organic pollutants and ammonia nitrogen. The main organic components are volatile phenols, benzenes, nitrogen-containing heterocyclic compounds, biphenyls, petroleum, etc. COD is 4000mg / L, volatile phenol is 800mg / L, ammonia nitrogen is 100mg / L, and conductivity is 4000µs / cm.

[0036] The pretreated coal chemical wastewater enters the biochemical treatment system, usually using a pre-denitrification biological denitrification process, such as anoxic-aerobic (A / O) process. The denitrifying bacteria in the anoxic reactor use the organic pollutants in the coal chemical industry wastewater as the carbon source, and the nitrosonitrogen or nitronitrogen in the reflux supernatant as the electron acceptor to carry out respiration and life activities and reduce them into nitrogen (N 2 ) escape, to achieve denitrification an...

Embodiment 2

[0040] Take the wastewater treatment of a coal chemical plant as an example.

[0041] Coal chemical industry wastewater contains high concentrations of refractory organic pollutants and ammonia nitrogen. The main organic components are volatile phenols, benzenes, nitrogen-containing heterocyclic compounds, biphenyls, petroleum, etc. COD is 5000mg / L, volatile phenol is 1000mg / L, ammonia nitrogen is 150mg / L, and conductivity is 5000µs / cm.

[0042] The pretreated coal chemical wastewater enters the biochemical treatment system, usually using a pre-denitrification biological denitrification process, such as anoxic-aerobic (A / O) process. The denitrifying bacteria in the anoxic reactor use the organic pollutants in the coal chemical industry wastewater as the carbon source, and the nitrosonitrogen or nitronitrogen in the reflux supernatant as the electron acceptor to carry out respiration and life activities and reduce them into nitrogen (N 2 ) escape, to achieve denitrification a...

Embodiment 3

[0046] Take the wastewater treatment of a coal chemical plant as an example.

[0047] Coal chemical industry wastewater contains high concentrations of refractory organic pollutants and ammonia nitrogen. The main organic components are volatile phenols, benzenes, nitrogen-containing heterocyclic compounds, biphenyls, petroleum, etc. COD is 6000mg / L, volatile phenol is 1500mg / L, ammonia nitrogen is 200mg / L, and conductivity is 5000µs / cm.

[0048] The pretreated coal chemical wastewater enters the biochemical treatment system, usually using a pre-denitrification biological denitrification process, such as anoxic-aerobic (A / O) process. The denitrifying bacteria in the anoxic reactor use the organic pollutants in the coal chemical industry wastewater as the carbon source, and the nitrosonitrogen or nitronitrogen in the reflux supernatant as the electron acceptor to carry out respiration and life activities and reduce them into nitrogen (N 2 ) escape, to achieve denitrification a...

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Abstract

The invention discloses a hardly-degradable organic wastewater comprehensive treatment and zero discharge treatment method and a system thereof. The method comprises the following steps: wastewater goes through a biochemical treatment unit to remove most organic pollutants, obtained wastewater enters a hardness removal unit, carbon dioxide absorption is carried out to generate a carbonate precipitate, the precipitate is separated out to reduce the hardness, discharged water enters an ozone catalytic oxidation unit to carry out advanced degradation of hardly-degradable organic matters in order to obtain salt-containing wastewater, the salt-containing wastewater is filtered by an ultrafiltration unit, and the ultrafiltered wastewater enters an electrodialysis treatment unit to further concentrate and desalinate in order to obtain freshwater and strong brine which can be reused. The biochemical treatment unit, the hardness removal unit, the ozone catalytic oxidation unit, and the ultrafiltration unit and the electrodialysis treatment unit are combined, multiple technologies are combined, so the organic pollutants and inorganic salts in the wastewater are removed step by step, and zero discharge of the wastewater is realized; and tail gas of the ozone catalytic oxidation unit goes through a tail gas treatment and reuse system, and obtained tail gas can be reused in the biochemical treatment unit, so environmental protection-economy dual benefits are reached.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a comprehensive treatment and zero-discharge treatment method and system for refractory organic wastewater. Background technique [0002] With the development of petrochemical, organic chemical and other industries using organic chemical raw materials, there are more and more types of macromolecular organic substances that may exist in wastewater. According to reports, there are more than 100 common organic pollutants, mainly polycyclic aromatic hydrocarbons (PAH), nitrogen-containing organic compounds, halogenated hydrocarbons and other miscellaneous organic compounds. [0003] Up to now, industries such as oil refining, pharmaceuticals, leather, steel, foundry, rubber, non-ferrous metals, papermaking, chemical industry, petrochemical, textile, pesticide, paint and ink will discharge industrial wastewater containing refractory organic matter to varying degrees. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/444C02F1/4693C02F1/78C02F3/00C02F5/02C02F9/00C02F2301/08C02F2303/22
Inventor 李海波盛宇星李玉平刘亚丽魏学勇
Owner 徐州赛科康仑智能装备有限公司
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