At present, industrial wastewater and urban domestic wastewater are one of the sources of water pollution in China, especially with the continuous expansion of production scale and the rapid development of industrial technology, the sources of organic wastewater containing heavy metals are increasing.
Adsorption technology of coconut shell activated carbon in various industrial wastewater treatment plants:
The activated carbon method can effectively adsorb mercury from various industrial wastewater. Some factories in China have adopted this method to treat mercury containing wastewater, but it is only suitable for treating low concentration mercury containing wastewater. When the mercury concentration in wastewater is high, it can be treated first to reduce the mercury concentration in the wastewater, and then adsorbed by activated carbon.
By passing wastewater with a mercury content of 1-2mg/L or less through an activated carbon filter tower, the mercury content in the discharged water can be reduced to 0.01-0.05mg/L. After recycling mercury, activated carbon can be regenerated and reused. The mercury content in the wastewater of a certain anthraquinone dye factory in Japan is 50-60mg/L. Lime water is first added for stirring and precipitation reaction, and separated into precipitate and clear liquid in the settling tank. 96% of mercury can be removed by lime precipitation method, and the mercury content in the clear liquid can be reduced to 1-3mg/L. Then, the clear liquid is sent to a granular activated carbon tank, and the mercury content in the wastewater can be reduced to 0.1-0.01mg/L after adsorption. The wastewater finally flows into the wastewater treatment plant, and is diluted 10-20 times before being discharged.
The treatment effect of activated carbon is related to many factors, including the initial form and concentration of mercury, the amount and type of activated carbon, pH control value, and the contact time between activated carbon and mercury containing wastewater. Increasing the amount of activated carbon and increasing the contact time can improve the removal rate of mercury.
https://www.naturecarbon.com/wood-based-activated-carbon/granular-activated-carbon.html
