Membrane Concentrated water treatment of a pharmaceutical company in Hohhot, Inner Mongolia
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 |
Membrane Concentrated water treatment of a pharmaceutical company in Hohhot, Inner Mongolia |
|
2 |
Address |
Hohhot, Inner Mongolia |
|
3 |
Treatment of wastewater industry |
Concentrated water after membrane concentration of pharmaceutical wastewater membrane |
|
4 |
Capacity |
3Ton/hour |
|
5 |
Process Technology |
Raw water-oxidation system-softening flocculation sedimentation-preheating system-three-effect evaporation concentration-crystallization system |
|
6 |
Process introduction |
The project is a sodium chloride wastewater evaporation treatment project. The front section adopts reverse osmosis and high pressure reverse osmosis treatment, and the DTRO concentrated water is used for evaporation treatment. Considering the high hardness of the concentrated water and the scale inhibitor for the complexation of calcium and magnesium hardness, it needs oxidation pretreatment before evaporation.Decomplexation and softening will be carried out to prevent scaling which will affect evaporation efficiency during evaporation. Three-effect evaporation is selected.Durign this process,sodium chloride is concentrated to supersaturation, and separated by thermal crystallization. |
