Treatment of sodium chloride wastewater from a pharmaceutical and chemical enterprise in Weifang
Sodium Chloride 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 chloride 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 108 ° C, which is suitable for MVR evaporation. The physical properties of the data are as follows:
Sodium chloride solubility
|
Item |
Maximum dissolved mass in 100g water at the following temperatures / g |
|||||||||||
|
0 |
10 |
20 |
25 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
|
|
Sodium chloride |
35.7 |
35.8 |
36 |
|
36.3 |
36.6 |
37 |
37.3 |
37.8 |
38.4 |
39 |
39.8 |
Sodium chloride boiling point
|
Item |
Boiling point /℃of the solution at the following concentrations (g / 100g water) |
||||||
|
10 |
25 |
40.7 |
50 |
75 |
100 |
222 |
|
|
Sodium chloride |
101.6 |
104.6 |
108.8 |
|
|
|
|
Project
|
No |
Item |
Introduction |
|
1 |
Name |
Treatment of sodium chloride wastewater from a pharmaceutical and chemical enterprise in Weifang |
|
2 |
Address |
Shandong Weifang |
|
3 |
Treatment of wastewater industry |
Pharmaceutical intermediate wastewater |
|
4 |
Capacity |
3t/h sodium chloride MVR evaporation treatment |
|
5 |
Process Technology |
Raw water - preheating system - MVR evaporation concentration - crystallization system |
|
6 |
Process introduction |
The sodium chloride wastewater of this project has low boiling point and is suitable for MVR evaporation crystallization. The raw water quality of the project is better, the organic matter is lowerIt can be go through MVR evaporative crystallization process directly. After evaporation, the condensate water effluent water conductivity is below 50us/cm.the material of the heat exchange tube of the heat exchanger is made of TA2, and the other part is 2205. |
