The harm caused by excessive heavy metals in sewage to the environment and human health is multifaceted. Heavy metal pollution exists widely in various environments such as water, air and soil, and has an impact on the atmospheric ,water and soil environment. In particular, the soil environment is obviously damaged. The accumulation in the soil will lead to an imbalance in the soil ecosystem and a decline in its functions, affect the growth of crops, and consequently affect food security.
Heavy metals cannot be biodegraded, but they are bioaccumulative and can directly threaten higher organisms, including human beings. Heavy metal pollution has become a major problem for the global environment and sustainable development, causing numerous biological and human health issues. The harm caused by excessive heavy metals in sewage is far-reaching and serious, and effective prevention and control measures need to be taken to reduce its impact on the environment and human health.
Heavy metal scavengers are chemical agents specifically used for wastewater treatment. Their main function is to form strong chemical bonds with various heavy metal ions in wastewater, thus achieving the removal of heavy metal ions. They possess strong chelating ability and can effectively react with heavy metals to form insoluble substances, especially for mercury and cadmium. They can adsorb almost all heavy metals. Especially in wastewater treatment, all dissolved residual heavy metals can be removed through simple treatment.
Metal precipitates have good temperature stability, and it is very difficult for heavy metals to be released back into the environment again. It is an environmentally friendly heavy metal scavenger. In addition, it has good toxicological and biological characteristics, with very low toxicity, as well as good storage stability and operational safety. This method is simple to operate and has a relatively low cost, and it is suitable for treating sewage with a relatively high content of heavy metals.
Real-time monitoring of the content of heavy metals in sewage, timely adjustment of the treatment process, and prompt actions in response to excessive levels are important means to ensure that sewage treatment meets the standards and to protect the environment.
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