High-efficiency flocculant for rapid removal of heavy metals in water

Abstract

The invention relates to an efficient flocculating agent for rapidly removing heavy metals in water. The efficient flocculating agent comprises a mixture A and a mixture B, wherein the mixture A comprises the following components in parts by mass: 100 parts of No.2 Hangjin soil, 5-10 parts of soil bacteria and 15-25 parts of activated carbon; and the mixture B comprises the following components in parts by mass: 10-20 parts of iron oxide, 10-20 parts of iron chloride, 20-50 parts of poly-aluminum chloride, 2.5-5 parts of an organic flocculating agent, 25-50 parts of cement and 16-32 parts of sodium thiosulfate. The efficient flocculating agent disclosed by the invention can be used for rapidly and effectively removing a variety of heavy metals such as mercury, lead, chromium, cadmium, arsenic and copper in the water, is short in reaction time, cannot cause secondary pollution, can be directly fed without early dissolution, is simple in use method, and can be widely applied to removal of the heavy metals in various industrial wastewater, polluted underground water, lakes, rivers and reservoirs.

Description

Technical field [0001] The invention relates to a high-efficiency water treatment flocculant used for industrial waste water, polluted groundwater, lakes, rivers and reservoirs. Background technique [0002] The problem of heavy metal pollution in China's water is very prominent, with the pollution rate of rivers, lakes and reservoirs as high as 80.1%. The Yellow River, Huaihe River, Songhua River, Liaohe River and other ten major river basins, the pollution degree of heavy metals exceeding the standard section are all Category V; the total Cu, total Pb, and total Cd content in the sediments of Taihu Lake are all at a light pollution level; the main stream of the Huangpu River In surface sediments, Cd exceeded the background value by 2 times and Pb by 1 time; in Suzhou Creek, all Pb exceeded the standard, Cd exceeded the standard by 75%, and Hg exceeded the standard by 62.5%. In 35.11% of urban rivers, the total Hg exceeded the surface water standard of Class III, 18.46% of the ...

AI Technical Summary

Problems solved by technology

[0004] Traditional flocculants mainly include low-molecular flocculants such as aluminum salts and iron salts, which have the disadvantages of slow flocculation and sedimentation, loose and easily broken flocs, and high chemical consumption; high-molecular flocculants such as basic polyaluminum chloride ( PAC), polyaluminum chloride, polyferric sulfate, etc., have high cost, narrow scope of application, and are easily affected by water temperature and pH value; polydimethyldiallylammonium chloride such as polyacrylamide flocculant, etc. It has strong neurotoxicity and certain carcinogenicity. When a large amount of polyacrylamide is used to treat wastewater, it will produce polymer residues, destroy the biological chain of water body, and then affect human health.

At the same time, the sludge produced by traditional flocculants is unstable and easy to dissolve heavy metals. Not only will dioxins be produced during sludge combustion, but it will also cause new pollution to the atmosphere due to the unstable heavy metal fly ash.