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A method for combined treatment of nitrogen-containing organic wastewater and pickling waste liquid

A technology for organic wastewater and pickling waste liquid, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., to achieve the effects of recycling, improving removal efficiency, and promoting conversion efficiency

Active Publication Date: 2017-01-11
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to use supercritical water oxidation method to treat nitrogen-containing organic wastewater, pickling waste liquid / water mixture, synergistically remove ammonia nitrogen, nitrate nitrogen and organic pollutants in mixed wastewater, and realize the recovery of heavy metals

Method used

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  • A method for combined treatment of nitrogen-containing organic wastewater and pickling waste liquid

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Embodiment 1

[0030] Such as figure 1 As shown, the corresponding labels of the components in the present invention are as follows: 1 lye pool, 2 pickling waste pool, 3 nitrogen-containing organic waste water pool, 4 homogeneous pool, 5 high-pressure pump, 6 temperature control system, 7 preheating device, 8 first heat exchanger, 9 supercritical water oxidation reactor, 10 second heat exchanger, 11 high temperature and pressure control system, 12 buffer vessel, 13 desalination system, 14 air separation system, 15 brine drying system, 16 Gas-liquid separation device, 17 gas-water heat exchange system, 18 heavy metal recovery device, 19 hot water reuse device.

[0031] The supercritical water oxidation reaction device in the present invention comprises: a heating and temperature control system 6, a preheater 7, a first heat exchanger 8, a supercritical water oxidation reactor 9, a second heat exchanger 10, and a high-temperature pressure control system 11 , buffer container 12, desalination ...

Embodiment 2

[0041] The operation of each component is the same as in Example 1. The reaction conditions in the supercritical water oxidation reactor are: temperature 400°C, pressure 23MPa, reaction time 90 seconds, oxygen partial pressure 3MPa, and supercritical water oxidation technology is used to treat chlorpyrifos production wastewater.

[0042] Influent TOC 4500mg / L, ammonia nitrogen 220mg / L, adding stainless steel pickling and rinsing wastewater, NO 3 - The concentration is 5880mg / L, the total chromium is 156mg / L, the total nickel is 2.6mg / L, the ratio of the dosage of stainless steel pickling and rinsing wastewater to the dosage of chlorpyrifos production wastewater is 0.9, and the pH of the mixed wastewater is adjusted to 6.2. Water oxidation system, TOC removal rate reaches 98.3%, ammonia nitrogen removal rate reaches 90.5%.

Embodiment 3

[0044] The temperature is 400°C, the pressure is 23MPa, the reaction time is 90 seconds, and the partial pressure of oxygen is 3MPa. Supercritical water oxidation technology is used to treat chlorpyrifos production wastewater. Influent TOC 4500mg / L, ammonia nitrogen 220mg / L, adding stainless steel pickling and rinsing wastewater, NO 3 - The concentration is 5880mg / L, the total chromium is 156mg / L, the total nickel is 2.6mg / L, the ratio of the dosage of stainless steel pickling and rinsing wastewater to the dosage of chlorpyrifos production wastewater is 2.4, mix evenly, adjust the pH to 6.2, and pass through supercritical water Oxidation system, TOC removal rate reaches 99.9%, ammonia nitrogen removal rate reaches 99.8%.

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Abstract

The invention discloses a combined treatment method of nitrogen-containing organic waste water and acid pickling waste liquid. The method comprises the steps of uniformly mixing the nitrogen-containing organic waste water and the acid pickling waste liquid, so that mixed waste water is obtained; and treating by utilizing a supercritical water oxidization reaction system to remove ammonia nitrogen, nitrate nitrogen and organic pollutants in the mixed waste water are eliminated and realize recovery of heavy metal. According to the combined treatment method, by adding high-concentration NO<3->waste water, the characteristic that NO<3-> is more easily subjected to oxidization-reduction reaction with ammonia nitrogen and organic pollutants is utilized so that reaction of NH3+NO<3->+reductive organic C+O2->N2+H2O+CO2 can be greatly promoted; NO<3-> is reduced into nitrogen; ammonia nitrogen is oxidized into nitrogen; and the organic pollutants are oxidized into carbon dioxide and water.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and specifically relates to the use of supercritical water oxidation technology to treat a mixture of nitrogen-containing organic waste water and pickling waste liquid, to synergistically remove ammonia nitrogen, nitrate nitrogen and organic pollutants in the mixed waste water, and to realize the recovery of heavy metals method. Background technique [0002] There are a wide range of sources of nitrogen-containing organic wastewater in my country. For example, the chemical industry (pesticides, medicines, dyes, organic synthesis intermediates, etc.) produces a large amount of nitrogen-containing organic wastewater. This type of wastewater contains a large number of nitrogen-containing pollutants. The resulting environmental problems and The existing environmental risks are prominent. On the one hand, many nitrogen-containing organic pollutants (such as pyridine, tricyclazole and oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72
Inventor 周海云吴海锁姜伟立程伟喻学敏王媛周灵君范亚民于晓宁
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI