Unlock instant, AI-driven research and patent intelligence for your innovation.

Plasma flue gas treatment for separation of so in high concentration brine 4 2- make caso 4 method and system

A technology of flue gas treatment and plasma, which is applied in the direction of gaseous effluent wastewater treatment, water softening, water/sewage treatment, etc., can solve the problems of high operating cost, difficulty in salt separation, large dosage of chemicals, etc., and achieve improvement Concentration effect, the effect of increasing the concentration ratio

Active Publication Date: 2020-10-16
JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to theoretical analysis, in the process of evaporation and salt separation, high concentration SO 4 2- will cause Na 2 SO 4 , NaCl and K 2 SO 4 , The allowable range of separation of KCl is very small, and what is often obtained is a mixed salt of chloride salt and sulfate, and with the circulation of the concentration process, the content of sulfate is getting higher and higher, and it is more difficult to separate the salt
[0004] In the chlor-alkali industry, for high SO 4 2- SO removal from high brine 4 2- It is often removed by adding barium salt or calcium salt, but this method will cause secondary pollution, there is a risk of chemical poisoning, and the amount of chemical dosing is large, the operating cost is high, and the SO in the chlor-alkali industry 4 2- The concentration is generally ≤ 5 g / L to meet the requirements, but this concentration still cannot meet the requirements in the field of industrial wastewater treatment, especially in the industrial salt separation system, and further removal with chemicals will require greater costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Plasma flue gas treatment for separation of so in high concentration brine <sub>4</sub> <sup>2-</sup> make caso <sub>4</sub> method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Contains Na + 、K + , Cl - , SO 4 2- The industrial wastewater enters the water inlet tank, and the NaCl and KCl contents in the wastewater are 15% to 20%, and the SO 4 2- It is 11 ~ 12 g / L. Wastewater enters NF-1 through a lift pump and a high-pressure pump, and the inflow flow rate is 4.0 m 3 / h or so, the operating pressure is 3.0~3.5MPa, and the temperature is 20~25℃.

[0033] NF-1 produced water about 3.6 m 3 / h, SO 4 2- About 3.2 ~ 3.5 g / L, product water enters NF-2. The concentrated water after NF-1 treatment is about 0.4 m 3 / h; SO 4 2- About 90 g / L, the concentration factor is about 8 times, and the concentrated water enters the sulfate radical remover.

[0034] NF-2 produces about 3.1 m of water 3 / h, SO 4 2- 3 / h, SO 4 2- About 15g / L, concentrated water is returned to the water inlet tank.

[0035] SO of the whole nanofiltration (NF) process system 4 2- The removal rate is about 93%.

[0036] Calcium chloride is added to the sulfate remo...

Embodiment 2

[0038] Contains Na + 、K + , Cl - , SO 4 2- The industrial waste water enters the water inlet tank; the NaCl and KCl contents in the waste water are 15-17%, and the SO 4 2- About 10 g / L. Wastewater enters NF-1 through a lift pump and a high-pressure pump, and the inflow flow rate is 20 m 3 / h, the operating pressure is 3.0 ~ 3.5MPa, and the temperature is around 25°C.

[0039] NF-1 produces about 18 m of water 3 / h, SO 4 2- 2.7 ~ 3.1 g / L, NF-1 product water enters NF-2. SO in concentrated water after NF-1 treatment 4 2- It is about 75g / L, the concentration ratio is 7-8 times, and the concentrated water enters the sulfate radical remover.

[0040] NF-2 production water is 15.3 m 3 / h, SO 4 2- 3 / h, SO 4 2- It is 13 g / L, and the concentrated water is returned to the water inlet tank.

[0041] SO of the whole nanofiltration (NF) process system 4 2- The removal rate is about 92%.

[0042] Calcium chloride is added to the sulfate remover to ensure that SO 4 2...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method and system for preparing CaSO4 by separating SO4<2-> from high-concentration salt water during plasma flue gas treatment. The system comprises a nanofiltration processsystem and a CaSO4 producing process system, wherein the NF process system is used for separating the divalent SO4<2-> and monovalent salt ions, and is divided into NF-1 and NF-2; the CaSO4 producingprocess system is used for removing the SO4<2-> which is highly concentrated in NF-1 concentrated water to obtain the CaSO4 with high purity, softening a supernatant and then enabling the supernatantto reflow into a water inlet tank. Through the method and the system, the SO4<2-> can be separated from high-salt wastewater with the concentration of the 15-20% without secondary pollution to obtainthe CaSO4 with the high purity, so that the recycling of the SO4<2-> and near-zero discharge of the wastewater in the process systems are achieved.

Description

technical field [0001] The invention relates to the field of industrial high-salt wastewater treatment, in particular to a plasma flue gas treatment for separating SO from high-concentration brine 4 2- CaSO 4 methods and systems. Background technique [0002] Chloride and sulfate in industrial high-salt wastewater have actual use value, and direct concentration and discharge cause resource waste and environmental pollution. Therefore, the salt in high-salt wastewater can be recycled; and high-salt wastewater Many kinds of ions often coexist in wastewater, and in many cases, different salts need to be treated separately and recovered for utilization. Current technologies, such as conventional flocculation, sedimentation, filtration, etc., can remove impurities such as heavy metals and SS in brine very well, and obtain + 、K + , Cl - , SO 4 2- industrial salt water. [0003] At present, in the field of industrial wastewater treatment in my country, especially in the pr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01B9/02C02F9/04C02F103/18
CPCC01B9/02C01F11/46C02F1/442C02F5/02C02F2101/101C02F2103/18
Inventor 沈烁江中央孙钟华田君国
Owner JIANGSU TIANYING ENVIRONMENTAL PROTECTION ENERGY COMPLETE EQUIP CO LTD