Hebei Messi Biology Co., Ltd. stated that in the application of magnesium hydroxide as a neutralizing agent to treat acidic wastewater, foreign countries have entered the stage of large-scwasteale production. There is no problem with its basic technology. In terms of state, the magnesium hydroxide with the largest production volume is slurry, which is characterized by lower cost than other neutralizing agents (such as sodium hydroxide, etc.). In the production process, the main problem is to solve the stability of slurry magnesium hydroxide. A variety of suitable surfactants have been developed abroad to continuously improve the stability time of slurry magnesium hydroxide. Therefore, the length of stability time has become one of the quality standards of slurry magnesium hydroxide.
It can be seen from this that how to improve the stability of slurry magnesium hydroxide in the process of producing it, that is, selecting an efficient surfactant, has become a key issue for the rapid development of slurry magnesium hydroxide. Although its application has been expanded abroad, efficient surfactants are still being studied to obtain conditions for surface modification with better stability.
Since foreign countries have mature experience in this area, our country should learn from this experience as soon as possible, apply magnesium hydroxide to the field of treating acidic wastewater as soon as possible, and develop slurry magnesium hydroxide with higher stability than foreign countries, so as to Increase innovation in the production process of slurry magnesium hydroxide.
The application of magnesium hydroxide in treating industrial wastewater (non-acidic industrial wastewater and wastewater containing heavy metals, etc.) is determined by its good adsorption performance. However, due to the small specific gravity of magnesium hydroxide, the sedimentation rate is slow after adding wastewater, and peptization will occur. Therefore, magnesium hydroxide must be modified. In order to obtain magnesium hydroxide with better adsorption performance, faster sedimentation speed, and easy filtration, a composite magnesium hydroxide water treatment agent can be prepared (the added composite agent also has adsorption capacity, which plays a role in synergistic adsorption and easy sedimentation) dual role), can solve the above existing problems.
Hebei Messi Biology Co., Ltd. stated that by using magnesium hydroxide composite water treatment agent to treat printing and dyeing wastewater, the decolorization rate can reach ≥99%, and the COD can meet the national emission standards. From a technological perspective, if COD is above 1000 mg/L, it can meet the emission standards through secondary treatment. If COD is ≤100 mg/L, it only needs one treatment to meet the emission requirements. In terms of cost, when compared under the same equipment and other conditions, it is lower than the cost of currently used coagulants such as iron and aluminum to treat printing and dyeing wastewater.
