Preparation method of flocculant for removing low-temperature low-turbidity ammonia nitrogen wastewater

A technology of ammonia nitrogen wastewater and low turbidity, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve the problem of unsatisfactory removal rate of ammonia nitrogen treatment, achieve large flocs and good effect , The effect of alum flower formation time is short

Inactive Publication Date: 2012-11-14
株洲江海环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the unsatisfactory removal rate of low-concentration ammonia-nitrogen in low-temperature and low-turbidity wastewater by the existing flocculants above, the present invention provides a preparation method for removing low-temperature and low-turbidity ammonia-nitrogen-containing wastewater flocculants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, take 67g of solid sodium acrylate into a 500mL round-bottom flask, add 40mL of distilled water, and heat until dissolved; then inject 24g of methyl ethylene oxide and 32g of hexadecyltrimethylamine bromide into the flask and stir, and the constant temperature is controlled at 80°C Reaction for 2 hours; polyethylene polyamine was added, and the polymerization reaction occurred at a temperature of 80 ° C; after polymerization for 5.0 hours, 320 g of liquid polyaluminum chloride was added, and the stirring reaction was continued for 30 minutes; 56% ferric sulfate solution, stir well and ripen.

[0020] After diluting the prepared flocculant 10 times with distilled water, add 0.7mL to 200mL of clear and transparent natural water (or secondary sedimentation tank effluent), stir rapidly, and within 2s, flocs can be seen to form, and the flocs gradually change. After precipitation, the ammonia nitrogen content in the supernatant was measured from 9 mg / L to 0.5 mg / L, and...

Embodiment 2

[0022] First, take 63g of solid sodium acrylate into a 500mL round-bottomed flask, add 38mL of distilled water, and heat until dissolved; then inject 24g of methyl ethylene oxide and 30g of hexadecyltrimethylamine bromide into the flask and stir, and the constant temperature is controlled at 78°C It should be 1 hour; polyethylene polyamine was added, and the polymerization reaction occurred at a temperature of 78 ° C; after 4.7 hours of polymerization, 290 g of liquid polyaluminum chloride was added, and the stirring reaction was continued for 30 minutes; 56% ferric sulfate solution, stir well and ripen.

[0023] After diluting the prepared flocculant 10 times with distilled water, add 0.5 mL to 150 mL of clear and transparent natural water body (or secondary sedimentation tank effluent), stir rapidly, within 2s, alum formation can be seen, and the flocs gradually change. After precipitation, the ammonia nitrogen content in the supernatant was measured from 7 mg / L to 0.3 mg / L,...

Embodiment 3

[0025] First, take 65g of solid sodium acrylate into a 500mL round-bottomed flask, add 39mL of distilled water, and heat until dissolved; then inject 23g of methyl ethylene oxide and 29g of hexadecyltrimethylamine bromide into the flask and stir, and the constant temperature is controlled at 79°C Reaction for 2 hours; polyethylene polyamine was added, and polymerization reaction occurred at a temperature of 79 ° C; after polymerization for 4.8 hours, 280 g of liquid polyaluminum chloride was added, and the stirring reaction was continued for 30 minutes; 56% ferric sulfate solution, stir well and ripen.

[0026] After diluting the prepared flocculant 10 times with distilled water, add 0.5 mL to 150 mL of clear and transparent natural water body (or secondary sedimentation tank effluent), stir rapidly, within 2s, alum formation can be seen, and the flocs gradually change. After precipitation, the ammonia nitrogen content in the supernatant was flocculated from 5mg / L to 0.1mg / L, ...

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Abstract

The invention discloses a preparation method of a flocculant for removing low-temperature low-turbidity ammonia nitrogen wastewater. The preparation method comprises the specific steps as follows: firstly, taking 62-68g of acrylic acid, adding 38-40mL of distilled water, and heating to dissolve the mixture; filling methyloxirane and hexadecyl trimethyl ammonium bromide into a flask, stirring, reacting at the constant temperature of 78-80 DEG C, adding polyethylene polyamine with a mass ratio of 1.5%, and performing polymerization reaction; adding 280-320g of liquid polymeric aluminium chloride (PAC), and continuing to stir; and keeping the temperature to be constant, adding a ferric sulfate solution, fully stirring and curing the mixture. According to the PAC polypropylene compound flocculant prepared by the preparation method, the ammonia nitrogen in the low-temperature low-turbidity wastewater is reduced from 5-10mg / L to 0.5mg / L through the flocculant; and the alum floc forming time is short and the flocculated body is large and firm.

Description

technical field [0001] The invention relates to a preparation method of a flocculant for removing low-temperature and low-turbidity ammonia-nitrogen-containing wastewater, belonging to the field of wastewater treatment. Background technique [0002] Flocculation is one of the most commonly used key links in wastewater treatment process. It greatly affects the operating conditions of subsequent processes, and the final effluent quality and cost. Therefore, it has become an important scientific and technological research and development field in environmental engineering. Efficient flocculation technology system is composed of three aspects: excellent flocculant, reactor and automatic control dosing, among which flocculant is the core function. At present, the treatment of low-temperature and low-turbidity ammonia nitrogen-containing wastewater is one of the difficult problems in water supply treatment. Due to the difficulty in hydrolysis of the flocculant under low temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08G73/02C02F101/16
Inventor 雷春生张凤娥麦源珍
Owner 株洲江海环保科技有限公司
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