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Method for separating salt from high-sulfur low-chlorine salt-containing wastewater

A technology of salt-containing wastewater and separation method, which is applied in alkali metal sulfite/sulfate purification, water softening, chemical instruments and methods, etc., can solve the problems of unfavorable large-scale application, uneconomical, and high process energy consumption, Achieve the effect of ensuring long-term stable operation, improving tolerance and high separation efficiency

Inactive Publication Date: 2020-06-30
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the existing technologies for treating saline wastewater all use evaporation to recover sodium sulfate in wastewater. This setting leads to low tolerance to organic matter in the crystallization process, large circulation volume, low efficiency, and poor process controllability. Moreover, the process consumes high energy, is uneconomical, and is not conducive to large-scale application, especially not suitable for the separation and recovery of salt in high-sulfur and low-chlorine saline wastewater.

Method used

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  • Method for separating salt from high-sulfur low-chlorine salt-containing wastewater
  • Method for separating salt from high-sulfur low-chlorine salt-containing wastewater
  • Method for separating salt from high-sulfur low-chlorine salt-containing wastewater

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Embodiment 1

[0047] This embodiment provides a method for separating salt in high-sulfur and low-chlorine saline wastewater. The high-sulfur and low-chlorine saline wastewater to be treated is the reverse osmosis concentrated water of a refining and chemical enterprise; the process flow diagram is as follows figure 1 shown. Specific steps are as follows:

[0048] (1) pretreatment: get 15L high-sulfur and low-chlorine type saline waste water, the molar concentration ratio of sodium sulfate and sodium chloride contained in this saline waste water is 1:0.2, and total salinity is about 1.2wt%; Add 0.85g of calcium oxide and 2.65g of sodium carbonate successively in the salty wastewater to reduce the total content of calcium and magnesium to 45ppm, and then obtain the softened saline wastewater I after filtering and separating to remove the sediment; add 4.6 g to the softened saline wastewater I After adjusting the pH to 7.2 with mL concentrated hydrochloric acid, add 0.05 g of sodium hexameta...

Embodiment 2

[0067] This embodiment provides a method for separating salt in high-sulfur and low-chlorine saline wastewater. The high-sulfur and low-chlorine saline wastewater to be treated is reverse osmosis wastewater from a coal chemical enterprise; the process flow diagram is as follows figure 1 shown. Specific steps are as follows:

[0068](1) pretreatment: get 4L high-sulfur and low-chlorine type saline wastewater, the molar concentration ratio of sodium sulfate and sodium chloride contained in this saline wastewater is 1:5, and the total salinity is about 5wt%; Add 0.45g of calcium oxide and 1.6g of sodium carbonate in turn to the wastewater to reduce the total content of calcium and magnesium to 30ppm, and then filter and separate to remove the sediment to obtain softened saline wastewater I; add 1mL concentrated Adjust the pH to 8.5 with sulfuric acid and then add 0.03g of phosphine-based polyacrylic acid scale inhibitor to obtain softened saline wastewater II; 2 o 2 Removal of...

Embodiment 3

[0073] This embodiment provides a method for separating salt in high-sulfur and low-chlorine saline wastewater. The high-sulfur and low-chloride saline wastewater to be treated is high-pressure reverse osmosis concentrated water from a petrochemical enterprise; the process flow diagram is as follows figure 1 shown. Specific steps are as follows:

[0074] (1) pretreatment: get 1.5L high-sulfur low-chlorine type saline waste water, the molar concentration ratio of the sodium sulfate and sodium chloride contained in this saline waste water is 1:12, and total salinity is about 9wt%; Add 0.7g of calcium oxide and 2.2g of sodium carbonate in sequence to the salty wastewater to reduce the total content of calcium and magnesium to 42ppm, and then filter and separate to remove the precipitate to obtain softened saline wastewater I; The concentration is 10% hydrochloric acid to adjust the pH to 5.5, and then add 0.01g of amino trimethylene phosphonic acid scale inhibitor to obtain soft...

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Abstract

The invention provides a method for separating salt from high-sulfur low-chlorine salt-containing wastewater. According to the method, sodium sulfate and sodium chloride in the salt-containing wastewater are sequentially separated and enriched through cooling crystallization and membrane separation on the basis of a phase diagram principle, and meanwhile, sodium sulfate and sodium chloride products available for sale and reuse water are obtained by combining the procedures of pretreatment, concentration, sodium chloride evaporative crystallization, sodium sulfate recrystallization, filtrationdrying and the like. According to the method provided by the invention, sodium sulfate and sodium chloride in the high-sulfur low-chlorine salt-containing wastewater are completely recycled in the form of a single product, the separation effect is good, the purity of the obtained product is high, meanwhile, water is completely recycled, near-zero emission is realized, and the method is a real, efficient and environment-friendly recycling process; moreover, the separation method is low in energy consumption, high in efficiency, simple to operate, capable of treating high-sulfur low-chlorine salt-containing wastewater from different sources, high in universality and suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to a method for separating salt in high-sulfur and low-chlorine saline waste water, belonging to the field of waste water treatment and resource utilization. Background technique [0002] At present, the sewage treatment problems of domestic refining and chemical enterprises are prominent, the pressure of environmental protection is great, and the situation of upgrading to meet the standards is urgent. The wastewater generated in the petroleum refining process is mainly composed of oily wastewater, sulfur-containing wastewater, saline wastewater and high-concentration ammonia-nitrogen wastewater, among which saline wastewater is one of the more difficult wastewater to treat. Reverse osmosis (RO), as an efficient desalination technology, can be used to produce high-quality water, and has been widely used in advanced treatment and reuse projects of saline wastewater in refining and chemical enterprises. However, during the operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/16C01D3/14C02F101/10C02F101/12C02F101/30
CPCC01D3/14C01D5/16C01P2006/80C02F1/04C02F1/441C02F1/4672C02F1/66C02F1/722C02F1/76C02F1/78C02F5/02C02F5/06C02F5/086C02F5/14C02F9/00C02F2101/101C02F2101/12C02F2101/30
Inventor 张锁江王道广王均凤王毅霖张晓飞李亚辉史佳腾崔朋蕾
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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