High-sulfate wastewater treatment method

A treatment method, high sulfate technology, applied in the field of wastewater treatment and purification, can solve the problems of high treatment cost, high cost, high cost, etc., and achieve the effect of reducing treatment cost and low treatment cost

Inactive Publication Date: 2018-10-16
戴安娜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing technology, some high-concentration sulfate wastewater (referring to the sulfate content greater than 100,000 mg / L) cannot be treated by biological methods, and the cost of using physical and chemical methods is too high. If the process is treated by evaporation first and then biochemical , not only the cost of evaporation is high, but also the evaporated sulfate is hazardous solid waste, which needs to be entrusted to relevant units for secondary treatment, which also requires higher treatment costs

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  • High-sulfate wastewater treatment method

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Embodiment 1

[0023] A certain pigment production wastewater: COD is 26000mg / L, ammonia nitrogen is 1100mg / L, sodium sulfate content is 150g / L.

[0024] Adopt the processing method provided by the present invention to process: the waste water to be treated first passes through the low-temperature desalination system, utilizes the characteristic that the solubility of sulfate reduces at low temperature to separate out part of the sulfate, and the sodium sulfate content in the effluent is 28g / L, and then enters the anoxic biological pool, Therefore, when the system is started, fresh industrial water twice the amount of water is added for dilution to ensure that the salt content of the biochemical system is 9.5g / L. System sludge concentration, the sludge in the MBR pool returns to the front end of the anoxic biological pool, and the reflux ratio is 200%; the COD of the effluent from the MBR membrane pool is 120mg / L, enters the membrane concentration system, and the sulphate content of the efflu...

Embodiment 2

[0027] A flue gas desulfurization wastewater: COD is 8000mg / L, sodium sulfate content is 110g / L.

[0028] Adopt the processing method provided by the present invention to process: the waste water to be treated first passes through the low-temperature desalination system, utilizes the characteristic that the solubility of sulfate reduces at low temperature to separate out part of the sulfate, and the sodium sulfate content in the effluent is 30g / L, and then enters the anoxic biological pool, Therefore, when the system is started, fresh industrial water twice the amount of water is added for dilution to ensure that the salt content of the biochemical system is 10g / L. Sludge concentration, the sludge in the MBR pool returns to the front of the anoxic biological pool, and the reflux ratio is 200%; the COD of the effluent from the MBR membrane pool is 90mg / L, enters the membrane concentration system, and the sulfate content of the effluent is 0.5% after being concentrated for 3 time...

Embodiment 3

[0031] A pesticide production wastewater: COD is 11200mg / L, sodium sulfate content is 90g / L.

[0032] Adopt the processing method provided by the present invention to process: the waste water to be treated first passes through the low-temperature desalination system, utilizes the characteristic that the solubility of sulfate reduces at low temperature to separate out part of the sulfate, and the sodium sulfate content in the effluent is 29g / L, and then enters the anoxic biological pool, Therefore, when the system is started, fresh industrial water twice the amount of water is added for dilution to ensure that the salt content of the biochemical system is 10g / L. Sludge concentration: the sludge in the MBR pool flows back to the front of the anoxic biological pool, and the reflux ratio is 200%; the COD of the effluent from the MBR membrane pool is 180mg / L, and it enters the membrane concentration system. The COD is 4mg / L, and it is returned to the front of the anaerobic biologic...

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Abstract

The invention relates to a high-sulfate wastewater treatment method. The method comprises the following steps: (1) low-temperature desalination: to-be-treated wastewater is desalinated under low temperature, so that part of sulfate is separated out; (2) biochemical treatment: microbes are utilized to degrade organic matters and ammonia nitrogen in the wastewater; (3) salt membrane separation treatment: the inorganic salt of biochemical effluent water is concentrated, and fresh water flows back for biochemical treatment in step (2); (4) electrocatalytic oxidation treatment: the concentrated inorganic salt water treated by step (3) is deeply oxidized; (5) resin adsorption treatment: the electrocatalytically oxidized effluent water of step (4) undergoes adsorption treatment by resin, and an alkali liquor regeneration or solvent regeneration method is adopted by a resin regeneration system. According to the invention, by secondary salt separation and dilution effects, high-sulfate wastewater can be treated by adopting a highly economical biochemical method, and thereby the treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment and purification, in particular to a treatment method for treating high-sulfate wastewater by using a combined physical, chemical and biochemical process. Background technique [0002] Wastewater with high sulfate content can be divided into two categories according to its discharge source: one is mining wastewater containing sulfate. Most of my country’s mine resources are coal mines, pyrite and polymetallic sulfide ores. During the mining process, the ore The sulfur and sulfide contained are oxidized to form sulfate, so the SO4 in the resulting mining wastewater 2- The concentration is generally greater than 1000mg / L, but due to the low content of organic matter in the wastewater, it is not suitable for biochemical treatment. The second is the drainage of some fermentation, pharmaceutical, and light industries. The common ones are: monosodium glutamate wastewater, petroleum refining...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/10
CPCC02F1/285C02F1/441C02F1/442C02F1/4672C02F3/30C02F3/34C02F9/00C02F2101/101C02F2301/08
Inventor 戴安娜
Owner 戴安娜
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