Method for treating high-salt organic wastewater

A technology for organic wastewater and wastewater, applied in separation methods, multi-stage water treatment, water/sewage treatment, etc., can solve problems such as lack of effective treatment methods, and achieve the effects of less impurities, high purity, and low operating costs.

Active Publication Date: 2017-05-10
自然资源部天津海水淡化与综合利用研究所
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Problems solved by technology

[0007] Aiming at the problems of considerable difficulty and lack of effective treatment methods in the treatment of high-salt organic wastewater, the present invention introduces a method for treating high-salt organic wastewater, which combines concentrated salt extraction with biochemical treatment to remove inorganic salts and organic matter step by step. Realize the discharge of waste water up to the standard

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  • Method for treating high-salt organic wastewater

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Effect test

Embodiment 1

[0044] Embodiment 1: Wastewater treatment method with high content of organic matter and sodium chloride:

[0045] 1 ton of wastewater discharged from casing production contains 80kg of sodium chloride and 100kg of organic matter.

[0046] The first concentrated salt extraction: heat the wastewater to 65°C, add 276kg of sodium carbonate to the water until the wastewater is saturated; cool down to -5°C, and precipitate 680kg of sodium carbonate decahydrate crystals and 72kg of sodium chloride crystals; Centrifuge to obtain 492kg of mixed salt crystals and high-organic concentrated mother liquor (containing 24kg sodium carbonate, 8kg sodium chloride); use 2°C saturated aqueous solution of sodium carbonate as washing liquid to wash the mixed salt crystals, and remove the chloride in the crystals. Sodium is dissolved in the washing mother liquor to obtain sodium carbonate decahydrate crystals and washing mother liquor; the washing mother liquor is heated to 95°C, evaporated and co...

Embodiment 2

[0052] Embodiment 2: Wastewater treatment method with high content of organic matter and magnesium chloride:

[0053] 1.5t of wastewater discharged from dye production contains 60kg of magnesium chloride and 120kg of refractory organic matter.

[0054] Concentration and salt extraction for the first time: heat the wastewater to 60°C, add 543kg of magnesium sulfate monohydrate solid to the water until the wastewater is saturated; cool down to -5°C, and precipitate 964.4kg of magnesium sulfate heptahydrate crystals and 72.5kg of magnesium chloride hexahydrate; The crystallization wastewater is centrifuged to obtain 1016.6 kg of mixed salt crystals and concentrated mother liquor with high organic content (containing 1.74 kg of magnesium sulfate and 26 kg of magnesium chloride); use 3° C. saturated aqueous solution of magnesium sulfate as washing liquid to wash the mixed salt crystals, and the crystals Magnesium chloride in the solution is dissolved in the washing mother liquor to...

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Abstract

The invention discloses a method for treating high-salt organic wastewater. According to the method, concentrated extracted salt is combined with biochemical treatment, and inorganic matters and organic matters are removed step by step, so that up-to-standard emission of the wastewater is realized. The method comprises the specific steps: adding a dehydrating agent into the wastewater which is heated to be 40 DEG C to 80 DEG C until the wastewater is saturated; cooling the saturated wastewater to be -5 DEG C to 5 DEG C; separating out mixed salt crystals; centrifuging and separating crystal separation wastewater to obtain the mixed salt crystals and a concentrated mother solution containing high organic matter content; washing the mixed salt crystals to obtain dehydrating agent hydrate crystals; evaporating a washing mother solution and carrying out concentration and salt extraction; heating the dehydrating agent hydrate crystals to be 95 DEG C to 150 DEG C; carrying out crystal transformation dehydration to obtain a regenerated dehydrating agent and condensed water; carrying out 3 to 5 times of the concentration and salt extraction on the concentrated mother solution containing the high organic matter content to obtain a salt-containing concentrated mother solution containing the high organic matter content; diluting the salt-containing concentrated mother solution containing the high organic matter content with the condensed water and carrying out the biochemical treatment to obtain up-to-standard wastewater. The method disclosed by the invention has moderate process conditions; the dehydrating agent can be circularly utilized; the energy consumption is low, the treatment cost is low and the emission standards of the wastewater are met.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to a treatment method for high-salt organic waste water. Background technique [0002] With the rapid development of the national economy, people's quality of life has been improved, and the discharge of urban domestic sewage, agricultural sewage and industrial wastewater has also risen sharply, resulting in fresh water being polluted to varying degrees. Effective wastewater treatment methods are urgently needed to achieve Discharge. In wastewater treatment, high-salt organic wastewater is the most difficult to treat. High-salt organic wastewater produced by many industries such as chemical industry, metallurgy, coking, dyestuffs, and pesticides has the characteristics of complex components, various organic substances, and high content of inorganic salts. The existing treatment methods for such industrial wastewater mainly include evaporation concentration method, biological trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14B01D1/00C01D3/06C01D7/24C01F5/40C02F101/30C02F1/38C02F1/04C02F101/12
CPCB01D1/00C01D3/06C01D7/24C01F5/40C02F1/00C02F1/04C02F1/38C02F9/00C02F2101/12C02F2101/30C02F2301/08
Inventor 张辉王俐聪高书宝张琦马来波刘伟黄西平
Owner 自然资源部天津海水淡化与综合利用研究所
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