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Method for removing organic arsenic in cultivation wastewater by anaerobic granular sludge

A technology for anaerobic granular sludge and aquaculture wastewater, applied in water/sludge/sewage treatment, anaerobic digestion treatment, chemical instruments and methods, etc., to achieve solid-liquid separation, many adsorption sites, and investment-free Effect

Active Publication Date: 2012-06-13
合肥庐阳科技创新集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, for organic arsenic in aquaculture wastewater, because aquaculture wastewater contains a large amount of organic matter, and organic arsenic contains complex organic functional groups, the method for treating inorganic arsenic in general wastewater is no longer applicable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: chicken farm wastewater treatment

[0015] 1. Add anaerobic granular sludge into the UASB reactor to 30% of the reactor volume, and wait for domestication.

[0016] 2. Add the sewage retrieved from the chicken farm to the reactor, and add FeSO with a concentration of 5-50mg / L in the influent 4 solution. The reaction zone volume of the reactor was about 1.5 liters. The pH in the reactor was maintained at 6.0-8.0 by sodium hydroxide solution, and the temperature was 30°C. Under these conditions, it was operated for 2 months to obtain enhanced anaerobic granular sludge.

[0017] 3. On the basis of the strengthened anaerobic granular sludge, the feed water in the reactor is changed to aquaculture wastewater containing roxarsarsenic or arsanic acid, in which the content of organic arsenic is 30 mg / L. The operating conditions of the reactor are as follows: the temperature is controlled at 30°C, the hydraulic retention time is 24 hours, and the pH is controll...

Embodiment 2

[0020] Embodiment 2: pig farm wastewater treatment

[0021] 1. Add anaerobic granular sludge into the UASB reactor to 40% of the reactor volume, and wait for domestication.

[0022] 2. Add the sewage retrieved from the pig farm to the reactor, and add FeSO with a concentration of 5-50mg / L in the influent 4 solution. The reaction zone volume of the reactor was about 1.5 liters. Maintain the pH in the reactor at 6.5-7.5 and the temperature at 35°C. After running for 2 months under these conditions, an enhanced anaerobic granular sludge system was obtained.

[0023] 3. On the basis of the strengthened anaerobic granular sludge, the feed water in the reactor is changed to aquaculture wastewater containing roxarsarsenic or arsanic acid, wherein the content of organic arsenic is 20mg / L. The operating conditions of the reactor are as follows: the temperature is controlled at 32°C, the hydraulic retention time is 12-60 hours, and the pH is controlled within the range of 7.0-7.5. ...

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Abstract

The invention discloses a method for removing organic arsenic in cultivation wastewater by anaerobic granular sludge, which comprises the steps of: intensifying the anaerobic granular sludge by FeSO4; feeding roxarsone or arsanilic acid-containing cultivation wastewater into the intensified anaerobic granular sludge; controlling the temperature in an arsenic reactor at 25-35DEG C, the hydraulic retention time for 12-60h, and the PH value of solution in the reactor at 6.0-8.0; and running a rector till that the concentration of roxarsone or arsanilic acid in the water discharged out of the reactor is reduced to be less than 50mug / L so as to obtain the acclimatized anaerobic granular sludge. The organic arsenic-containing cultivation wastewater is treated by the acclimatized anaerobic granular sludge, so that the method is high in organic arsenic removing efficiency, and the arsenic content in the discharged water achieves the discharge standard. The method has the advantages of being wide in raw material sources, simple in preparation, and low in cost.

Description

1. Technical field [0001] The invention relates to a method for removing and recovering organic arsenic in aquaculture wastewater, in particular to a method for removing organic arsenic in aquaculture wastewater by using anaerobic granular sludge. 2. Background technology [0002] Organic arsenic is widely used as a feed additive in broiler and pig farming because of its antibacterial and growth-promoting effects. The organic arsenic additives used in my country mainly include roxarsarsenic and arsanic acid. Organic arsenic is difficult to degrade in the digestive tract of animals, and about 80% is excreted in the form of drug. Raising a broiler chicken consumes about 150 mg of roxars on average, and about 8 billion broilers are slaughtered in my country every year. Therefore, the roxars and its metabolites discharged into the environment by the broiler industry in my country can reach 1,000 tons each year, plus the pig industry , higher emissions. Due to the partial solubi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F101/20
Inventor 胡真虎李柯刘元璐
Owner 合肥庐阳科技创新集团有限公司
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