Neutralization of Acid Wastewater and Magnesium Hydroxide Slurry from Seawater Electrolytic Pretreatment

Abstract:

Produced in industrial production processes such as electrolysis, electroplate and metal pickling, industrial wastewater, which contains acids, varieties of heavy metal and whose pH value is less than 6, can be very damaging to our daily life and environment and is an urgent issue to be solved. In recent years, with environmental protection becoming an important issue around the world, and environmental regulations becoming more and more complete, the traditional water treatment technology which can cause secondary pollution is gradually restricted, and this leads to the result that environmental scientists and engineers pay more attention on the development and application of "environmentally friendly" water treatment technology ^[1]. Of all acid wastewater neutralizers, magnesium hydroxide, known as "green and safe neutralizer" ^{[2, 3]}, is safe, reliable, non-toxic, harmless, and has high buffer performance, high activity, high adsorption capacity, and no corrosivity compared with traditional strong alkali substances (such as CaO, Ca (OH) ₂ and NaOH, etc.). Therefore magnesium hydroxide has been widely used in the acid wastewater neutralization ^[4].

• Periodical: Advanced Materials Research (Volumes 1073-1076)
• Pages: 949-954
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1073-1076.949
• Online since: December 2014
• Authors: Jing Nie, Shou Zhi Yi*
• Keywords: Acid Wastewater, Electrolysis, Magnesium Hydroxide, Seawater Pretreatment

References

[1] Yubin Tang, Zhu Lu, Qingxiang Zhao. Research and Application Progress of Green Water-treatment Technology[J]. Technology of Water Treatment. 2002, 18(1): 1-5. In Chinese.

[2] Ruxin Guo. The application of magnesium hydroxide to industrial wastewater treatment[J]. Industrial Water Treatment. 2002, 20(2): 1-4. In Chinese.

[3] Yanmei Song, Shouzhi Yi. Progress on the Production and Application of Mg(OH)2[J]. Sea-Lake Salt and Chemical Industry. 2006, 35(2): 15-20. In Chinese.

[4] Higguns，Matthew J Myers，R DEayne，Sprague，Nicolle M Barron，Kevin．Controlling hydrogen sulfide in wastewater using base addition．Proc．-WEFTEC'97．Water Envion．Fed．Annu．Conf．Expo．，70th，1997，(2)：587-594.

[5] Lie Wang. Technology and prospects of natural magnesium hydroxide in industrial wastewater treatment[J]. Non-ferrous Mining and Metallurgy. 2005, 7(21): 105-106. In Chinese.

[6] Zhu Lu, Lankun Cai. Technology of Water Treatment[M]. Chemical Industry Press. 2003(3): 12. In Chinese.