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Process and system for treating high salinity wastewater in coal chemical industry

A technology of high-salt wastewater and treatment process, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Solve problems such as complex crystalline solid components, and achieve the effects of saving water resources, high reliability, and reducing the scale of treatment

Inactive Publication Date: 2016-01-20
BEIJING JINGONG SEAWATER SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-salt water discharge evaporation pool will seep out and cause secondary pollution to the water source, and the crystalline solid has complex components, doped with harmful substances, and is very easy to be decomposed by moisture and enter the environment. The crystalline solid needs to be treated as hazardous solid waste for hazardous waste treatment
For enterprises that generate 30,000 to 50,000 tons of hazardous waste every year, the disposal cost of this treatment method is about 2,000 yuan / ton, accounting for more than 60% of the total cost of evaporation and crystallization, which is difficult for coal chemical enterprises to bear

Method used

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  • Process and system for treating high salinity wastewater in coal chemical industry
  • Process and system for treating high salinity wastewater in coal chemical industry
  • Process and system for treating high salinity wastewater in coal chemical industry

Examples

Experimental program
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Embodiment 1

[0054] see figure 1 , the treatment system of the coal chemical high-salt wastewater of the present embodiment comprises:

[0055] Mechanical filter tank, design the agent dosing point at the wastewater inlet of the mechanical filter tank, and use appropriate amount of flocculant and other chemicals to carry out flocculation, sedimentation and filtration treatment on the high-salt wastewater of the coal chemical industry, and the high-salt wastewater treated by the mechanical filter tank enters Nanofiltration membrane filter;

[0056] Nanofiltration membrane filter; the inlet water of the nanofiltration membrane filter is the high-salt wastewater treated by the mechanical filter tank, and the outlet water is the ED inlet water. The pore diameter of the nanofiltration membrane in this embodiment is 10 nanometers, and the operating pressure is generally 1.0 MPa; the operating pressure of the nanofiltration membrane in the present embodiment is generally 0.5~2.0MPa;

[0057] Io...

Embodiment 2

[0064] Other equipment in this embodiment is the same as in Embodiment 1, except that the ionic membrane reactor in this embodiment includes a primary ionic membrane reactor and a secondary ionic membrane reactor. The first-level ED concentrated brine from the first-level ionic membrane reactor enters the second-level ionic membrane reactor for further processing to obtain the second-level ED light brine and the second-level ED concentrated brine. The first ED light brine and the second ED light brine are mixed to obtain ED light brine, and this mixed ED light brine enters the reverse osmosis filter. In addition, the secondary ED concentrated brine can enter the evaporator to obtain high cleanliness salt.

[0065] The ionic membrane in Example 2 uses a special monovalent ion-selective homogeneous ionic membrane CIMS / AMS to form an ionic membrane device. The four membrane stacks are arranged in two stages, and the concentration difference between the two phases can reach 15 tim...

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Abstract

The invention provides a process and system for treating high salinity wastewater in the coal chemical industry. The process comprises a secure treatment procedure, an ionic membrane concentration procedure and a reverse osmosis (RO) procedure, wherein ED water inflow is obtained after the high salinity wastewater in the coal chemical industry is treated by adopting the secure treatment procedure and has hardness not more than 50mg / L; an ionic membrane is adopted for concentration treatment on the ED water inflow; ED strong brine and ED dilute brine are obtained after the ED water inflow is treated by the ionic membrane concentration procedure; RO desalted water and RO strong brine are obtained by treating the ED dilute brine by adopting an RO membrane; and the RO strong water phase flows back to a water inflow section of the secure treatment procedure. The process has the beneficial effects that total recovery of water resources and salt can be achieved by treating the high salinity wastewater in the coal chemical industry by adopting an electrodialysis and RO coupling process, thus achieving zero discharge treatment of the high salinity wastewater in the coal chemical industry; and the whole process has high stability and reliability.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a process and system for treating high-salt wastewater of coal chemical industry. Background technique [0002] my country's coal chemical industry is mostly produced in the western region, and water resources have become the main constraint factor restricting coal chemical projects. The high-salt wastewater discharged from the coal chemical production process and the harmless treatment of crystalline salt are currently a major bottleneck restricting the development of the new coal chemical industry. The salt TDS in high-salt wastewater of coal chemical industry reaches 10000-50000mg / L, SO 4 2- The concentration is 10,000-20,000 mg / L, and it is a sodium chloride / sodium sulfate mixed salt type, in which the concentration of sodium sulfate is greater than 20%. Another characteristic of concentrated brine from coal chemical industry is its high content of COD, which is refract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 杨昆孙伟哲
Owner BEIJING JINGONG SEAWATER SCI & TECH CO LTD
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