Heavy metal trapping agent for sewage treatment and preparation method thereof

Abstract

The invention discloses a heavy metal trapping agent for sewage treatment and a preparation method thereof. The heavy metal trapping agent for sewage treatment comprises, by weight, sodium lignin sulfonate, sodium tripolyphosphate, dichloroethane, soyabean protein, potassium hydroxide, urea, carbon disulfide, a cross-linking agent, montmorillonite, a surface active agent and ethidene diamine. The cross-linking agent is a compound of one, two or more of epoxy chloropropane, epoxy chlorobutane, glyoxal, malondialdehyde, glutaraldehyde, adipaldehyde and phthalic aldehyde. According to the heavy metal trapping agent for sewage treatment, the dual functions of trapping and flocculating can be similarly brought into play on low-concentration heavy metal sewage ion, practical performance of products is greatly promoted, the tripping capacity is high, the treatment effect of heavy metal with various forms is good, secondary pollution is avoided, and cost is low. The technique is simple, the sedimentation velocity is large, and stability is good.

Description

technical field [0001] The invention relates to the technical field of heavy metal treatment, in particular to a heavy metal scavenger for sewage treatment and a preparation method thereof. Background technique [0002] In today's industrial society, heavy metal wastewater comes from a wide range of sources, mainly from wastewater discharged from mining, smelting, electrolysis, electroplating, pesticides, medicines, paints, pigments and other enterprises. However, the heavy metal content and form of heavy metals in wastewater discharged from various industries are different, and the forms of heavy metals in wastewater discharged by a single enterprise may also be different, so it is difficult to use a single agent to remove heavy metals in wastewater. [0003] Among the existing agents for treating heavy metals in water, the most conventional Na2S or ferrous sulfate is generally added to the wastewater containing heavy metals, so that the heavy metals in the water are reduce...

AI Technical Summary

Problems solved by technology

Using these two methods to remove heavy metals in wastewater may cause the color of the water to become darker, causing secondary pollution, and basically has no treatment effect on complexed heavy metal wastewater

Although using some organic sulfur to treat wastewater can achieve a good treatment effect, the cost of raw materials is relatively expensive, and the cost performance is not high. Many enterprises cannot afford this expensive treatment cost.