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Method for preparing sewage flocculating agent capable of adsorbing heavy metal ions

A technology for adsorbing heavy metals and flocculants, which is used in adsorption water/sewage treatment, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc. long and other problems, to achieve the effect of low price and convenient use

Inactive Publication Date: 2012-05-30
TIANJIN SANNONGJIN TECH
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Problems solved by technology

At present, the flocculants used in sewage treatment plants to treat the above sewage pollutants take a long time to flocculate and settle, and the production process is complicated, the cost of the product is high, and the biological inhibitors, organic pollutants, nitrogen, phosphorus, etc. The removal effect is better, but the removal effect of heavy metal pollutants in sewage is poor

Method used

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Embodiment Construction

[0007] A preparation method of a sewage flocculant capable of adsorbing heavy metal ions is completed according to the following steps:

[0008] 1. Preparation of cross-linked starch: according to the above formula, put 400g of starch, 32ml of epichlorohydrin, and 600ml of 1% sodium chloride aqueous solution into the reaction vessel, stir to form a slurry, then slowly add 160ml of 15% sodium hydroxide and mix. , stirred for 6 hours, then adjusted the pH to 6.5 with 2% hydrochloric acid, filtered with suction, and dried to obtain cross-linked starch.

[0009] 2. Add 40g of the above-mentioned cross-linked starch into the reactor, then add 180ml of water and stir to form a slurry, pass nitrogen gas for 10 minutes, add initiator and ammonium cerium nitrate and stir for 5 minutes, add 50g of acrylonitrile to react for 1 hour, add 1% hydroxide Sodium 250ml, adjust the temperature to 70°C, stir for 2 hours, cool to room temperature, adjust the pH to 6.5 with 2%-4% hydrochloric acid,...

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Abstract

The invention relates to a method for preparing a sewage flocculating agent capable of adsorbing heavy metal ions. The method comprises the following steps of: preparing cross-linked starch from starch, epoxy chloropropane, a 1% sodium chloride water solution and 15% sodium hydroxide; and adding the cross-linked starch into a reactor, adding water into the cross-linked starch and stirring to form slurry, introducing nitrogen for 8-12 min, adding an initiator and ammonium cerium nitrate to be stirred, then, adding acrylonitrile to react for 1-1.5 h, adding 1% of sodium hydroxide, adjusting the temperature to 55-70 DEG C, stirring for 1-2 h, cooling to room temperature, finally, adjusting pH to be 6.5 by using 2-4% hydrochloric acid, filtering, and washing and drying to obtain a finished product. The method disclosed by the invention is low in cost and convenient to use. The sewage flocculating agent is capable of rapidly adsorbing and flocculating impurities and pollutants in sewage, in particular heavy metal ions, so that formed large flocculates rapidly sink, thus, the sewage is purified.

Description

Technical field: [0001] The invention belongs to a sewage treatment flocculant, in particular to a preparation method of a sewage flocculant capable of absorbing heavy metal ions. Background technique: [0002] The discharge of urban domestic sewage has caused serious environmental pollution. Due to the complexity of the wastewater components of various industrial and mining enterprises, the wastewater will contain a large number of biological inhibitors, organic pollutants, heavy metals, nitrogen, phosphorus and other substances. At present, the flocculants used in sewage treatment plants to treat the above sewage pollutants take a long time to flocculate and settle, and the production process is complicated, the cost of the product is high, and the biological inhibitors, organic pollutants, nitrogen, phosphorus, etc. The removal effect is better, but the removal effect of heavy metal pollutants in sewage is poor. Invention content: [0003] The purpose of the present i...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08B31/00C02F1/56C02F1/28B01J20/26B01J20/30
Inventor 韩文彬王辰王木兰张克森
Owner TIANJIN SANNONGJIN TECH
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