TEBAOLUO

Organic Wastewater Treatment Solution Customization Expert

   04.02

Evaporation and crystallization of a flame retardant sodium chloride wastewater 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

Evaporation and crystallization of a flame retardant sodium chloride wastewater in Weifang

2

Address

Shandong Weifang

3

Treatment of wastewater industry

Brominated flame retardant wastewater

4

Capacity

5t/h sodium chloride MVR evaporation treatment

5

Process Technology

Raw water - preheating system - MVR evaporation concentration - crystallization system

6

Process introduction

The bromine-based flame retardant wastewater has a large amount of flocculent precipitate after acid and alkali adjustment.Flocculation and sedimentation are required before evaporation, preventing scale formation during evaporation, which will result the low evaporation efficiency.MVR evaporation process is adopted for this project,together with two-stage piston centrifuge fan which has a higher degree of automation. The organic matter is in high concentration in the water and the CODcr is 18000-22000mg/l after testing. The boiling point will rise at the later stage of evaporation, and the evaporation will attenuat. According to these conditons,we decide to adopt single-effect MVR system to ensure stable operation. MVR system.

7

Project Photo

Inlet water

Evaporation water

salt discharge


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