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A method for efficient adsorption treatment of wastewater containing low concentration roxarsone

An adsorption treatment, low-concentration technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Large problems, such as simple preparation method, easy-to-obtain raw materials, and low-consumption treatment.

Inactive Publication Date: 2015-08-05
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • A method for efficient adsorption treatment of wastewater containing low concentration roxarsone

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Embodiment 1

[0028] combine figure 1 , a method of efficient adsorption treatment of the present embodiment containing low-concentration roxarsone wastewater, the steps are:

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

[0030] In the 0.2mol / L iron nitrate (Ⅲ) solution, add dropwise a sodium polyacrylate solution with a mass percentage concentration of 1% while stirring, where the average relative molecular mass of the sodium polyacrylate contained in the sodium polyacrylate solution is greater than 10,000 , because sodium polyacrylate with small molecular mass is easy to dissolve, the present embodiment uses sodium polyacrylate with an average relative molecular mass greater than 10,000, which is beneficial to the formation of large particle flocs. The dropping rate of the sodium polyacrylate solution in this embodiment is 10 drops per minute, and the stirring speed is 300 rpm. At 50°C, after the complexation reaction for 8 hours, let it stand sti...

Embodiment 2

[0036] A kind of efficient adsorption treatment method of the present embodiment contains low-concentration roxarsone waste water, and its steps are:

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

[0038] In the 0.05mol / L iron sulfate (Ⅲ) solution, add dropwise a sodium polyacrylate solution with a mass percentage concentration of 1% while stirring, where the average relative molecular weight of the sodium polyacrylate contained in the sodium polyacrylate solution is greater than 10,000 , because sodium polyacrylate with small molecular weight is easy to dissolve, the present embodiment uses sodium polyacrylate with an average relative molecular weight greater than 10,000, which is beneficial to the formation of large particle flocs. The dropping speed of the sodium polyacrylate solution in this embodiment is 15 drops per minute, and the stirring speed is 320 rpm. At 70°C, after the complexation reaction for 6 hours, let it stand, discard...

Embodiment 3

[0044] A kind of efficient adsorption treatment method of the present embodiment contains low-concentration roxarsone waste water, and its steps are:

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

[0046] In the 0.1mol / L ferric (Ⅲ) chloride solution, add dropwise a sodium polyacrylate solution with a mass percent concentration of 1% while stirring, where the average relative molecular weight of the sodium polyacrylate contained in the sodium polyacrylate solution is greater than 10000, because sodium polyacrylate with a small molecular weight is easy to dissolve, this embodiment uses sodium polyacrylate with an average relative molecular weight greater than 10000, which is beneficial to the formation of large particle flocs. In this embodiment, the dropping speed of the sodium polyacrylate solution is 20 drops per minute, and the stirring speed is 330 rpm. At 80°C, after the complexation reaction for 4 hours, let it stand still, discard t...

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Abstract

The invention discloses a method for efficiently adsorbing waste water containing low-concentration roxarsone, which belongs to the technical field of sewage treatment. The steps of the present invention are: Step 1, preparing polyacrylic acid iron (Ⅲ) complex suspension adsorbent; Step 2, pretreating waste water containing low-concentration roxarsone to remove suspended solids in waste water; Step 3, adding to the step 2. Add polyacrylic acid iron (Ⅲ) complex suspension adsorbent to the wastewater obtained from pretreatment, and the content of the added polyacrylate iron (Ⅲ) complex suspension adsorbent in the pretreated wastewater is 0.5~ 3.0g / L; step 4, adjust the pH range of the adsorption system obtained in step 3 to be 6~9, stir and adsorb for 60~120min, let stand for 30~60min for precipitation, and then separate the solid from the liquid. The invention can treat waste water containing low-concentration roxarsone with high efficiency and low consumption, is convenient to operate and easy to control, and is almost not affected 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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Patent Type & Authority Patents(China)
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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