Method for treating low- roxarsone waste water by efficient adsorption treatment

Abstract

The invention discloses a method for treating low-roxarsone waste water by efficient adsorption treatment, belonging to the field of a sewage disposal technology. The method comprises the steps of 1, preparing polyacrylic acid iron (II) complex suspended adsorbent; 2, pretreating the low- roxarsone waste water, and removing the suspended solid out of the waste water; 3, adding the polyacrylic acid iron (II) complex suspended adsorbent into the waste water pretreated in the step 2, wherein the content of the added polyacrylic acid iron (II) complex suspended adsorbent in the waste water obtained by the pretreatment is 0.5-3.0g / L; 4, adjusting the pH range of an adsorption system obtained in the step 3 to be 6-9, stirring for 60-120min for adsorption, standing still for 30-60min for precipitation, and then carrying out solid-liquid separation. The method can be used for efficiently treating the low-roxarsone waste water with low energy consumption, is convenient to operate and easy to control, and is hardly influenced by the salt content in the waste water.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a method for efficiently adsorbing waste water containing low-concentration roxarsone. Background technique [0002] With the acceleration of urbanization and industrialization in my country, the pollution of groundwater, surface water, and domestic water is becoming more and more serious. Water pollution and its prevention and control have become an important topic of widespread concern. On the one hand, people use methods such as environmentally friendly and green chemical synthesis routes to reduce pollution from the source and fundamentally; The new method is also becoming a hot spot at home and abroad. Through the joint efforts and practice of scientists, the treatment technologies for heavy metals, suspended solids (SS), biodegradable organic pollutants (BOD), nitrogen, phosphorus and other pollutants in water are becoming more and more perfect. H...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the low concentration of roxarsone in the treatment of waste water, the conventional coagulation method needs to consume a large amount of coagulant, less alum flowers, and low removal rate; the lack of selectivity of conventional adsorbents (such as activated carbon, etc.) problem, and provides a method for efficient adsorption treatment of low-concentration roxarsone-containing wastewater. The method provided by the invention combines the carboxylic acid group in sodium polyacrylate with Fe(Ⅲ) to form a well-dispersed "alum" "flower" flocs, the iron in the flocs undergoes adsorption and complexation with arsenic acid groups to form larger "alum flowers", which are easy to separate from water, and solve the problem of low cost in the use of Fe(III) coagulation and precipitation When the concentration of Roxarsone wastewater is used, the consumption of Fe(Ⅲ) is large, the particle size of "aluminum flowers" is small, and the amount is small, which makes it difficult to quickly separate from the water. At the same time, it also avoids the problem of secondary pollution caused by excessive iron content in the treated water.

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