Natural compound flocculant of chitosan, producing method and uses of the same

A technology of chitosan and flocculant, which is applied in the field of high ammonium nitrogen wastewater treatment, can solve the problems of long hydraulic retention time, difference in flocculation effect, high COD value, etc., and achieve low treatment cost, good pertinence, and good flocculation performance Effect

Inactive Publication Date: 2009-08-26
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) Organic flocculants have a better flocculation effect on monosodium glutamate wastewater, but different types of flocculants have different requirements for operating conditions, and the flocculation effects are also different
[0013] Disadvantages of anaerobic treatment: high COD value after treatment, long hydraulic retention time, and foul odor
However, in MSG wastewater treatment, there is no mature technology launched

Method used

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Examples

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preparation example Construction

[0055] The invention provides a kind of preparation method of chitosan natural composite flocculant, comprising the following steps:

[0056] 1. Select one or several natural materials containing silicates as the main body for mixing;

[0057] 2. Screening, drying, and grinding natural materials containing silicate as the main body into particles with a particle size of 1-300 mesh, and set aside;

[0058] 3. Choose one or several kinds of chitosans with different degrees of polymerization to mix;

[0059] 4. Choose one or several kinds of alkaline substances to mix.

[0060] Instructions:

[0061] 1. First use alkaline substances to adjust the pH value of the monosodium glutamate sewage between 1 and 4;

[0062] 2. Add flocculation aid;

[0063] 3, according to different water quality, will contain silicate class natural material directly add with powder form by the quantity of regulation, and standard addition is based on 5-30% that is equivalent to chemical oxygen demand...

Embodiment 1

[0069] The invention uses meadow soil, chitosan (polymerization degree=90%) and calcium chloride as raw materials. Among them, meadow soil is the main component, particle size: 200-300 mesh, chitosan is the auxiliary flocculant, calcium hydroxide and calcium chloride are the regulator of pH value and flocculation aid respectively. The mass ratio of meadow soil to chitosan was 5:3, and calcium chloride accounted for 2% of the mass of meadow soil.

[0070] Its usage method is:

[0071] (1) Adjust the pH value of monosodium glutamate sewage to about 4.0 with calcium hydroxide.

[0072] (2) Add calcium chloride.

[0073] (3) Add the prepared meadow soil into the sewage based on 30% of the mass number of the chemical oxygen demand (COD) of the sewage, and perform rapid stirring for about 5 minutes (80-100 rpm).

[0074] (4) Add chitosan.

[0075] (5) First stir rapidly (80-100 rpm) for 3 minutes, then stir at medium speed (40-60 rpm) for 10 minutes, then stir slowly (20-30 rpm)...

Embodiment 2

[0079] The invention uses red soil, chitosan (polymerization degree=90%) and calcium chloride as raw materials. Among them, red soil is the main component, particle size: 100-200 mesh, chitosan is the auxiliary flocculant, sodium hydroxide and calcium chloride are the regulator of pH value and flocculation aid respectively. The mass ratio of red soil to chitosan is 1.5:1, and calcium chloride accounts for 0.2% of the mass of red soil.

[0080] Its usage method is:

[0081] (1) Use sodium hydroxide to adjust the pH value of monosodium glutamate sewage to about 2.0.

[0082] (2) Add calcium chloride.

[0083] (3) Add the prepared red soil into the sewage based on 25% of the mass number of the chemical oxygen demand (COD) of the sewage, and perform rapid stirring for about 3 minutes (100-120 rpm).

[0084] (4) Add chitosan.

[0085] (5) First stir rapidly (100-120 rpm) for 5 minutes, then stir at medium speed (40-60 rpm) for 10 minutes, then stir slowly (10-20 rpm) for 30 min...

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Abstract

The invention discloses a naturally built flocculant of ecological safe chitosan and making method and application, which is characterized by the following: adopting cheap natural material with silicate to build with chitosan and adjuvant according to certain proportion and sequence; doing effective flocculation disposal for ammonium nitrogen in the waste water of gourment powder with simple technique, low energy consumption, stable flocculation water outlet effect and cheap cost; making the natural material with silicate selected from urban turfy soil, meadow soil, volcanic slag, red soil and so on as main component as the built flocculant; adding certain proportional natural chitosan as auxiliary component and alkaline material to adjust acid-base; improving the removing rate of the most difficult degradation of ammonium nitrogen over 75%; fitting for other waste water of high ammonium nitrogen in the industry with good spreading applying value.

Description

technical field [0001] The present invention relates to the treatment technology of waste water with high ammonium nitrogen, specifically a new high-efficiency ecologically safe chitosan natural compound flocculant and its preparation method and application in monosodium glutamate waste water, and the present invention can also be applied in industry In the treatment of other wastewater containing high ammonium nitrogen. Background technique [0002] The treatment of high ammonium nitrogen wastewater has always been a major problem that plagues the development of my country's food industry. Among them, the environmental problems of monosodium glutamate wastewater are the most prominent. With the rapid development of the MSG industry in recent years, the annual output of MSG in my country has reached 71.37×10 at the end of the 20th century. 4 tons, due to the large amount of waste water discharged in the production of MSG, and has as high as 10000-80000mgL -1 The direct di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52B01D21/01
Inventor 刘睿周启星张兰英
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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