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High-efficiency flocculation-adsorption treatment method for waste water containing low-concentration organic arsine preparations

An adsorption treatment, organic arsine technology, applied in adsorption water/sewage treatment, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. The preparation method is simple, the water quality of the effluent is stable, and the raw materials are easily available.

Inactive Publication Date: 2015-02-18
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0014] Aiming at the low-concentration organic arsine preparation in the water body, the conventional coagulation method needs to consume a large amount of coagulant, the alum flowers are few, the removal rate is low, and the conventional adsorbent (such as activated carbon, etc.) lacks selectivity, the invention provides A method for high-efficiency flocculation-adsorption treatment of wastewater containing low-concentration organic arsine preparations

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  • High-efficiency flocculation-adsorption treatment method for waste water containing low-concentration organic arsine preparations

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Effect test

Embodiment 1

[0036] combine figure 1 , a kind of high-efficiency flocculation-adsorption method of the present embodiment containing low-concentration roxarsone waste water, its steps are:

[0037] Step 1. Preparation of humic acid-iron (Ⅲ) composite suspension flocculation-adsorbent:

[0038] In 0.2mol / L, 50mL iron (III) nitrate solution, add 50mL of 1g / L sodium humate solution (HA-Na) dropwise while stirring, the dropping speed is 10 drops per minute, and the stirring speed is 200rpm. After reacting at a temperature of 50-100° C. for 4-8 hours, let it stand for cooling to form a certain concentration of humic acid-iron (Ⅲ) composite suspension flocculation-adsorbent, and shake well before use.

[0039] Step 2: Use a common reactor with a stirring system, which is connected to a dosing system for the suspended adsorbent. The low-concentration roxarsone wastewater containing roxarsone concentration of 10mg / L is pretreated to remove most of the suspended solids in the wastewater and contr...

Embodiment 2

[0043] A kind of flocculation-adsorption treatment of the present embodiment contains the method for low-concentration arkanic acid (para-aminophenylarsine acid) waste water, and its steps are:

[0044] Step 1. Preparation of humic acid-iron (Ⅲ) composite suspension flocculation-adsorbent:

[0045] In 0.1mol / L, 50mL iron sulfate (III) solution, add dropwise 50mL of 3g / L potassium humate solution while stirring, the dropping speed is 5 drops per minute, and the stirring speed is 200rpm. After reacting at a temperature of 80-90°C for 4-8 hours, let it stand for cooling to form a certain concentration of humic acid-iron (Ⅲ) composite suspension flocculation-adsorbent, and shake well before use.

[0046] Step 2: Use a common reactor with a stirring system, which is connected to a dosing system for the suspended adsorbent. The low-concentration arsanic acid wastewater containing arsanic acid concentration of 50mg / L is pretreated to remove most of the suspended solids in the wastew...

Embodiment 3

[0050] A kind of flocculation-adsorption method of the present embodiment contains low concentration roxarsone waste water, and its steps are:

[0051] Step 1. Preparation of humic acid-iron (Ⅲ) composite suspension flocculation-adsorbent:

[0052] In 0.2mol / L, 50mL iron (III) nitrate solution, add 50mL of 5g / L humic acid solution dropwise while stirring, the dropping rate is 10 drops per minute, and the stirring speed is 200rpm. After reacting at a temperature of 50-100° C. for 4-8 hours, let it stand for cooling to form a certain concentration of humic acid-iron (Ⅲ) composite suspension flocculation-adsorbent, and shake well before use.

[0053] Step 2: Use a common reactor with a stirring system, which is connected to a dosing system for the suspended adsorbent. The low-concentration roxarsone wastewater containing 80mg / L roxarsone is pretreated to remove most of the suspended solids in the wastewater and control the suspended solids concentration to less than 50mg / L.

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Abstract

The invention discloses a high-efficiency flocculation-adsorption treatment method for waste water containing low-concentration organic arsine preparations, and belongs to the technical field of sewage treatment. The method disclosed by the invention comprises the following steps: step 1, preparing a suspended flocculation-adsorption agent of humic acid-iron (III) composite substance; step 2, adjusting the pH of the low-concentration organic arsine waste water of pretreated solid suspended substance (SS), controlling the range of the pH during 5-9, and according to the content of organic arsine in the waste water, putting and adding the suspended flocculation-adsorption agent of the humic acid-iron (III) composite substance, which is obtained in the step 1; step 3, quickly stirring a flocculation-adsorption reaction system in the step 2 for 10 minutes at the rotating speed of 300 rpm, slowly stirring and adsorbing the flocculation-adsorption reaction system at a slow speed for 60-120 minutes at the rotating speed of 100 rpm, standing and precipitating the flocculation-adsorption reaction system which is stirred and adsorbed for 30-60 minutes, and then performing solid-liquid separation. Through adoption of the method disclosed by the invention, waste water containing the low-concentration organic arsine preparations (the content of the organic arsine preparations is not larger than 100mg / L) can be treated in the manners of high efficiency and low consumption, and the method is convenient to operate and easy to control.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and more specifically relates to a method for highly efficient flocculation-adsorption treatment of waste water containing low-concentration organic arsine preparations. Background technique [0002] Arsenic pollution mainly comes from the mining of arsenic-containing ores, metal smelting, and industrial and agricultural production and application processes. In ore mining and metal smelting, arsenic mainly exists in the form of inorganic arsenic such as sulfide and arsenic trioxide. In agriculture and animal husbandry, organic arsine preparations have been widely used as herbicides, insecticides, soil disinfectants, and feed additives. [0003] In the 1960s and 1970s, my country used organic arsine pesticides, such as Daojiaoqing, Daoning, Tianan, methylsulfurarsenic, thiram, etc., to prevent crop pests and diseases. Organic arsine pesticides have been widely used, but also cause large-scale pol...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/28C02F101/30
CPCC02F1/281C02F1/286C02F1/5236C02F1/5263C02F2101/30
Inventor 李时银梅婷彭云葛思怡王国祥倪利晓
Owner NANJING NORMAL UNIVERSITY
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