Sludge compound biocide

Abstract

The invention relates to a sludge compound biocide, in particular to a biocide which is mainly applied to oily sludge generated after the effluent treatment of oil refineries. Components of the sludge compound biocide have a total weight percentage of 100 percent and comprise: 40 percent to 75 percent of glutaraldehyde which is a main agent, 20 percent to 40 percent of dialkyl biquaternary ammonium salt biocide which is an adjuvant, and 5 percent to 30 percent of C8-C18 alkyl and/or dialkyl quaternary ammonium salt biocide which is an assistant. The compound biocide has the advantages of broad spectrum, high efficiency, fast result, long-lasting effect, small dosage, wide application range and the like, gives a good sterilizing performance with a pH value ranging from 6.0 to 9.5, has good penetrability, can kill phycomycetes in the sludge, is beneficial to the demulsification of sludge and realizes the separation of oil phase, water phase and solid phase.

Description

technical field [0001] The invention relates to a composite biocide, in particular to a composite biocide mainly used in treated sludge and oily sludge in oil refinery wastewater. Background technique [0002] Refining and chemical enterprises produce a large amount of oily sludge in the process of petroleum refining, petroleum extraction and refinery wastewater treatment. They mainly come from grease traps, flotation tanks, biologically activated sludge, crude oil dehydration tanks, oil storage tanks and waste oil tanks, etc. The high content of bacteria and algae in the sludge seriously affects the next step of sludge demulsification. The commonly used bactericides and algicides are easy to react with oil pollution and reduce the bactericidal ability of biocides. The ability is difficult to penetrate into the sludge, which affects the bactericidal and algae killing effect of the chemical, and reduces the demulsification effect of the sludge, resulting in insufficient thre...

AI Technical Summary

Problems solved by technology

They have played a certain role in controlling the bacteria and algae in circulating water. However, when glutaraldehyde single agent is used as a biocide, due to its poor penetration ability, the dosage of the agent is relatively large; common quaternary ammonium salts (including After the combination of dialkyl quaternary ammonium salt) and glutaraldehyde, the penetration ability of the agent is strengthened, but to achieve the same bactericidal effect, the dosage of the agent is still relatively large

Other patents related to glutaraldehyde such as CN03139646.1, CN98112806.8, CN97107140.3, CN98113676.1, CN98114208.7, CN97191642.X, CN97191671.3, CN98106772.7, CN01145564.0, CN00144203 .7, CN97111762.4, CN97122763.2, CN96122359.6, CN96100827.X, etc. aim to provide a liquid disinfectant with low irritating odor, low toxicity, weak irritation to skin and eyes, and good stability, This medicine should not be used in refinery oily sludge, wherein, CN03139646.1 introduces a kind of high-efficiency liquid disinfectant, though there are glutaraldehyde and quaternary ammonium salt in its composition, but the quaternary ammonium salt it refers to is chloride alkyl A mixture of dimethyl benzyl ammonium and alkyl dimethyl ammonium chloride; a large number of patents on glutaraldehyde introduce the application of glutaraldehyde in human and animal disinfection. After they are applied to oily sludge, the bactericidal effect None significant

[0004] There is no patent literature report on the compound biocide compounded by glutaraldehyde and dialkylbisquaternary ammonium salt biocide at home and abroad

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