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Recovery of Waste Acid and Alkali by Membrane Process

Waste acid and alkali are common names, but they are complicated to be born. Because they come from different industries, the composition is complex, and many of them are hazardous wastes.
Waste acid and alkali have the problems of wide sources and scattered industries. More than 90% of the waste acid is sulfuric acid, and the waste alkali is mostly sodium hydroxide. Take waste acid as an example. Waste acid is produced in a wide range of industries and enterprises, with large amount, wide distribution, strong toxicity and difficult management.

Characteristics of waste acid and alkali:
(1) The impact is great. In recent years, there have been frequent incidents of waste acid and alkali pollution.
(2) There are many problems, because it is difficult to handle and the cost is high, many companies illegally  discharge, transfer and dump.
(3) Wide range
(4) The hazard is great, and the ecosystems such as soil and river will be affected.
In view of the characteristics of waste acid and alkali, JIUWU HI-TECH has realized the recovery of waste acid and alkali by relying on the mature and perfect membrane integration technology in titanium dioxide industry, printing and dyeing desizing, viscose fiber industry.
Process flow of waste acid recovery from titanium dioxide secondary washing:
Flow chart of waste acid recovery from titanium dioxide secondary washing
Fig1. Flow chart of waste acid recovery from titanium dioxide secondary washing
water sample recovered from waste acid of titanium dioxide secondary
Fig 2. water sample recovered from waste acid of titanium dioxide secondary
washing
Process flow chart of waste alkali recovery from viscose & desizing
Flow chart of waste alkali recovery
Fig 3. Flow chart of waste alkali recovery
Desizing Waste alkali
Ceramic membrane device
Recovered alkali solution

Desizing Waste alkali

Ceramic membrane device

Recovered alkali solution


Fig4. Comparison photos before and after desizing wastewater treatment

JIUWU HI-TECH is one of professional ceramic membrane manufacturers of inorganic ceramic membrane elements and complete sets of equipment with the largest domestic production scale, the most variety and specifications, and the strongest research and development capabilities. Ceramic membrane has the characteristics of acid and alkali resistance, good chemical stability and good thermal stability.

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