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

An adsorption treatment and low-concentration technology, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of small particle size of "alum flower", difficult to quickly separate, and consumption Large and other problems, to achieve the effect of simple preparation method, easy-to-obtain raw materials, and low-consumption treatment

Inactive Publication Date: 2014-02-05
NANJING NORMAL UNIVERSITY
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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" "flowe

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

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Embodiment 1

[0028] Combine figure 1 In this embodiment, a method for high-efficiency adsorption treatment of low-concentration roxarsone wastewater contains the following steps:

[0029] Step 1. Preparation of polyacrylic acid iron (Ⅲ) complex suspension adsorbent:

[0030] In the 0.2mol / L ferric nitrate (Ⅲ) solution, while stirring, add dropwise a sodium polyacrylate solution with a mass percentage concentration of 1%, where the average relative molecular weight of sodium polyacrylate contained in the sodium polyacrylate solution is greater than 10,000 Since sodium polyacrylate with a small molecular mass is easy to dissolve, this embodiment uses sodium polyacrylate with an average molecular weight greater than 10,000, which is beneficial to the formation of large-particle flocs. In this embodiment, the dropping rate of the sodium polyacrylate solution is 10 drops per minute, and the stirring speed is 300 rpm. After the complexation reaction at a temperature of 50℃ for 8h, let it stand, dis...

Embodiment 2

[0036] In this embodiment, a method for high-efficiency adsorption treatment of low-concentration roxarsone wastewater contains the following steps:

[0037] Step 1. Preparation of polyacrylic acid iron (Ⅲ) complex suspension adsorbent:

[0038] In the 0.05mol / L ferric sulfate (Ⅲ) solution, add 1% sodium polyacrylate solution with mass percentage concentration while stirring, where the average relative molecular weight of sodium polyacrylate contained in the sodium polyacrylate solution is greater than 10,000 Since sodium polyacrylate with a small molecular mass is easy to dissolve, this embodiment uses sodium polyacrylate with an average molecular weight greater than 10,000, which is beneficial to the formation of large-particle flocs. In this embodiment, the dropping rate of the sodium polyacrylate solution is 15 drops per minute, and the stirring speed is 320 rpm. After the complexation reaction at 70℃ for 6h, let it stand, discard the supernatant, wash the precipitate with dei...

Embodiment 3

[0044] In this embodiment, a method for high-efficiency adsorption treatment of low-concentration roxarsone wastewater contains the following steps:

[0045] Step 1. Preparation of polyacrylic acid iron (Ⅲ) complex suspension adsorbent:

[0046] In the 0.1mol / L ferric chloride (Ⅲ) solution, while stirring, add dropwise a sodium polyacrylate solution with a mass percentage concentration of 1%, where the average molecular weight of sodium polyacrylate contained in the sodium polyacrylate solution is greater than 10,000. Since sodium polyacrylate with a small molecular mass is easy to dissolve, this embodiment uses sodium polyacrylate with an average relative molecular mass greater than 10,000, which is conducive to the formation of large-particle flocs. In this embodiment, the dropping rate of the sodium polyacrylate solution is 20 drops per minute, and the stirring speed is 330 rpm. After the complexation reaction at 80℃ for 4 hours, let it stand, discard the supernatant, wash the ...

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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...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 李时银梅婷朱江鹏彭云王国祥倪利晓
Owner NANJING NORMAL UNIVERSITY
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