A mine water evaporation project in Yulin, Shanxi (pilot test)
Sodium sulfate MVR Evaporation Crystallization Project
The organic matter of high salinity organic wastewater varies greatly according to the production process, and the types and chemical properties of the organic matter are quite different.The salt substances are mostly Cl-, SO42-, Na+, Ca2+ ,etc. If it is directly discharged, it has a great impact on the environment; and it is difficult to handle in the biochemical treatment process. These ions are essential nutrients for microbial growth, which can promote enzyme reaction and maintain membrane balance and regulate osmotic pressure.However,if these ion concentrations are too high, it will inhibit and toxic the microorganisms. High salt concentration, high osmotic pressure will cause dehydration of microbial cells and protoplast separation; salting out reduces dehydrogenase activity; high chloride ion has toxic effect on bacteria; High salt concentration and increased density of wastewater will let the the active mud to float and drain, which seriously affects the purification effect of the biological treatment system.
For high salt water, it mainly comes from the following aspects:
1. High-salt wastewater from chemical production processes;
2. From chemical wastewater treatment;
3. High-salt wastewater from freshwater recycling process.
For Sodium sulfate high salt water, the solubility of the material is low, and the boiling point is lower in the case of saturated solubility.The boiling point under atmospheric pressure is low, which is suitable for MVR evaporation. The physical properties of the data are as follows:
Sodium sulfate solubility
|
Item |
Maximum dissolved mass / g in 100g water at the following temperatures |
|||||||||||
|
0 |
10 |
20 |
25 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
|
|
Sodium sulfate |
4.5 |
9.6 |
10.2 |
27.9 |
40.8 |
48.4 |
46.7 |
45.3 |
44.1 |
43.7 |
43.9 |
42.3 |
Sodium sulfate boiling point
|
Item |
Boiling point / ℃ of the solution at the following concentrations (g / 100g water) |
||||||
|
10 |
25 |
40.7 |
50 |
75 |
100 |
222 |
|
|
Sodium sulfate |
100.6 |
101.6 |
|
|
|
|
|
Project
|
No |
Item |
Introduction |
|
1 |
Name |
A mine water evaporation project in Yulin, Shanxi (pilot test) |
|
2 |
Address |
SHANXI YULIN |
|
3 |
Treatment of wastewater industry |
Coal mine water |
|
4 |
Capacity |
400Ton/hour |
|
5 |
Process Technology |
Mine water - ultrafiltration - reverse osmosis - DTRO - evaporation (sodium sulfate salt) |
|
6 |
Process introduction |
The project is a pilot test of coal mine water zero-discharge. After concentrated by membrane,the mine water is treated by evaporation crystallization.Fine and mixed crystalline sodium sulfate is the products and they can meet the first-class product standard.With two-effect MVR evaporation crystallization,the mine water is treated comprehensively and the the treated water can meet the discharge standard.The success of pilot test provides practical treatment experience and process demonstration for the enterprise to reduce the mine water pollution problem. The project treatment process has been audited by the Tianjin University of Science and Technology.This project get high attention from all sectors of society and coal mining companies in the surrounding area. |
