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Precipitation, salt separation and zero discharge method and system for high-salinity industrial wastewater

A technology for industrial wastewater with high salt content, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve the problem of high investment cost of zero discharge system equipment, increased concentration of saline wastewater, Problems such as high operating pressure, to achieve the effect of improving the economic benefits of by-products, increasing the economic benefits of by-products, and reducing equipment investment costs

Pending Publication Date: 2019-07-23
INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist in the actual implementation process: 1. The concentration of sulfate radicals on the nanofiltration concentrated water side is high, and the concentration of saline wastewater continues to increase, resulting in high operating pressure and low recovery rate of the deep concentration membrane system on the nanofiltration concentrated water side. The water quality of the produced water fluctuates greatly, and the quality of the crystalline salt is unstable; 2. The sodium sulfate crystalline salt obtained from the treatment, due to its rich natural minerals, has a low value, coupled with the impact of transportation costs and customer acceptance, the crystallization of sodium sulfate The market for salt is not well sold, and most of the sodium sulfate crystalline salt is treated by free delivery; 3. It is necessary to invest in an evaporation crystallization system and an advanced oxidation system to meet the needs of zero-discharge treatment of wastewater, and the overall zero-discharge system equipment investment High cost, high energy consumption, high operating cost, and the evaporation crystallization system is a high-temperature and high-pressure equipment, and the operation risk is relatively high

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  • Precipitation, salt separation and zero discharge method and system for high-salinity industrial wastewater
  • Precipitation, salt separation and zero discharge method and system for high-salinity industrial wastewater
  • Precipitation, salt separation and zero discharge method and system for high-salinity industrial wastewater

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Experimental program
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Effect test

Embodiment 1

[0039] Such as Figure 2-4 As shown, the high-salt industrial wastewater sedimentation and salt zero discharge system includes a regulating tank 1, a pretreatment system 2, a sedimentation system 5 and a dehydration drying system 7. The outlet of the regulating pond 1 is connected to the inlet of the pretreatment system 2, and the high Salt-containing industrial waste water is regulated by the regulating tank 1 for water quality and quantity, and then enters the pretreatment system 2;

[0040] Pretreatment system 2 includes high-density sedimentation tank 2-1, submerged ultrafiltration system 2-2, reverse osmosis system 2-3, ion exchange resin equipment 2-4 and carbon remover 2-8, and the outlet of regulating tank 1 It is connected to the inlet of the pretreatment system 2, that is, the outlet of the regulating tank 1 is connected to the inlet of the high-density sedimentation tank 2-1; the outlet of the high-density sedimentation tank 2-1 is connected to the inlet of the subm...

Embodiment 2

[0046] Such as Figure 5 Shown, utilize the high-salt industrial waste water economical salinization method that embodiment 1 carries out, after high-salt industrial waste water is through homogeneous equalization, pretreatment, obtains total alkalinity (as CaCO 3 Low-alkalinity wastewater <50mg / L; low-alkalinity wastewater reacts with barium chloride, and after dehydration and drying, industrial precipitated barium sulfate is obtained.

[0047] The specific operation of homogenization and equalization is as follows: transport the high-salt industrial wastewater to the adjustment tank 1 to adjust the water quality and water quantity, and obtain the wastewater to be treated; Adjust the return water in the system to ensure the stability of the water quality and quantity of the high-salt industrial wastewater entering the pretreatment step.

[0048] The specific operation of pretreatment is: after the completion of homogenization and equalization, the wastewater to be treated is...

Embodiment 3

[0052] Such as Figure 5 Shown, utilize the high-salt industrial waste water economical salinization method that embodiment 1 carries out, after high-salt industrial waste water is through homogeneous equalization, pretreatment, obtains total alkalinity (as CaCO 3 Low-alkalinity wastewater <50mg / L; low-alkalinity wastewater reacts with barium chloride, and after dehydration and drying, industrial precipitated barium sulfate is obtained.

[0053] The specific operation of homogenization and equalization is as follows: transport the high-salt industrial wastewater to the adjustment tank 1 to adjust the water quality and water quantity, and obtain the wastewater to be treated; Adjust the return water in the system to ensure the stability of the water quality and quantity of the high-salt industrial wastewater entering the pretreatment step.

[0054] The specific operation of pretreatment is: after the completion of homogenization and equalization, the wastewater to be treated is...

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Abstract

The invention discloses a precipitation, salt separation and zero discharge method and system for high-salinity industrial wastewater. According to the method, after the high-salinity industrial wastewater is subjected to homogeneous and average pretreatment, low-alkalinity wastewater with the total alkalinity (in terms of CaCO3) smaller than 50 mg / L is obtained, the low-alkalinity wastewater andbarium chloride or calcium chloride are subjected to a reaction, and industrial precipitated barium sulfate or industrial byproduct gypsum is obtained after dewatering and drying. The system comprisesan adjusting tank, a pretreatment system, a settling system and a dewatering and drying system. The method and the system have the advantages as follows: a conventional evaporative crystallization process is replaced with chemical precipitation reaction under the conditions of normal temperatures and normal pressure, and zero discharge of the high-salinity industrial wastewater is realized; besides, high-quality sodium chloride, calcium sulfate OR barium sulfate is produced, and advantages of high-salinity wastewater and chemical reactions are combined; the quality of industrial products is guaranteed to the greatest extent through a chemical reaction, the purity is high, and the stability is good; the product is turned from sodium sulfate crystallized salt with lower economic value intoindustrially precipitating barium sulfate or industrial byproduct gypsum with high economic value.

Description

[0001] Technical field: [0002] The invention relates to the field of industrial wastewater treatment, in particular to a zero-discharge method and system for precipitation and salt separation of high-salt industrial wastewater. [0003] Background technique: [0004] The development of the coal chemical industry is the only way for China's energy strategic transformation, which is determined by the current situation of my country's energy resource endowment and the background of the energy revolution. my country's coal resources and water resources are negatively correlated. Taking the four provinces of Shanxi, Shaanxi, Ningxia, and Inner Mongolia in the middle and upper reaches of the Yellow River as examples, the coal resources here account for 67% of the national total, but the water resources here only account for the national water resources. 3.85% of resources, so water resources have become a key factor limiting the development of the coal chemical industry. [0005] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/06C02F9/10C01F11/46
CPCC02F9/00C01F11/462C01F11/46C02F1/52C02F1/444C02F1/441C02F1/42C02F1/58C02F1/44C02F1/4693C02F1/445C02F1/041C02F1/04C02F2209/08C02F2209/055C02F2209/07C02F11/12C02F11/121C01P2006/80C01P2006/60C01P2006/19C01P2004/61
Inventor 赛世杰张娜王巧玲贺蓉党平李买军许磊李乐
Owner INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH