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A method for reuse of glycine production waste water resources

A technology for the production of waste water and glycine, which is applied to chemical instruments and methods, water pollutants, ammonium sulfate, etc., can solve the problems of difficult simultaneous treatment and high pollution concentration, and achieve reduced pollution risk, low construction investment, and improved The effect of removal efficiency

Active Publication Date: 2022-04-22
湖北兴发环保科技有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Glycine, also known as aminoacetic acid, is an important raw material for medicine, pesticide, organic synthesis and biochemical research, and is also a very important organic synthesis intermediate. At present, the production method of glycine in China mainly adopts the traditional ammonolysis method of chloroacetic acid, and its main raw material is chlorine Acetic acid, liquid ammonia, and urotropine. The waste liquid produced by this method contains a large amount of ammonium chloride, urotropine, ammonia nitrogen, formaldehyde and methanol. The secondary steam condenses in the process of evaporating and recovering ammonium chloride. There are still a large amount of ammonia nitrogen, methanol and a certain amount of formaldehyde and hexatropine in the water, among which hexatropine is an important raw material and can be reused. Methanol is an important organic carbon source and can be used as a biochemical nutrient source. The concentration of COD, ammonia nitrogen, total nitrogen and other pollutants in the waste water is high, and it is difficult to deal with it at the same time, which has gradually become an industrial problem.

Method used

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  • A method for reuse of glycine production waste water resources
  • A method for reuse of glycine production waste water resources
  • A method for reuse of glycine production waste water resources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for recycling waste water resources produced by glycine, said method comprising the following steps:

[0032] (1) The raw water in the collection pond enters the ceramic membrane and is filtered to obtain sewage I;

[0033] (2) Sewage I enters the multi-stage nanofiltration system for separation and concentration. The water produced by the upper membrane is the feed water of the next membrane, and the concentrated water of the lower membrane flows back to the feed water of the upper membrane, and finally contains the concentrated water. The concentrated water of urotropine is reused from the effluent of the first stage membrane to the production workshop, and the produced water is sewage II;

[0034] (3) Sewage II enters the deamination membrane system for deep deamination treatment, and the effluent from the deamination membrane is used as a carbon source for biochemical treatment.

[0035] Preferably, in the step (1), the alkali dosing system controls the pH...

Embodiment 2

[0042] A company adopts the method of Example 1 to evaporate condensed water from glycine production wastewater, use special inorganic ultrafiltration membranes to remove impurities such as colloids and suspended solids in the water body, and use special multi-level organic membranes to separate and concentrate resource components such as urotropine. The special deamination membrane removes biochemical toxic components such as ammonia nitrogen and then conducts biochemical treatment:

[0043] Step 1) Use the alkali dosing system to control the raw water inlet pH value to 9-10, and use ceramic ultrafiltration membrane to filter;

[0044] Step 2) Use four-stage organic nanofiltration membranes for separation and concentration treatment. The water produced by the upper stage is the water inflow to the next-stage membrane. After urotropine) is reused from the first-stage membrane effluent to the workshop, and the produced water is subjected to subsequent deamination treatment;

...

Embodiment 3

[0052] Using the method of Example 1, the conditions of ceramic membrane, multi-stage nanofiltration system and deamination were screened.

[0053] One, the screening of step (1) ceramic membrane in the method

[0054] Select the wastewater to pass through three kinds of material membranes to verify the pretreatment and filtration effect. The 1# membrane material is ceramic material, the 2# membrane material is polypropylene; the 3# material is polysulfone material, and the wastewater after the membrane is sampled and analyzed. See Table 2 and Figure 3-5 .

[0055] Table 2 Comparison of effects before and after pretreatment

[0056] water sample Before membrane After passing through 1# membrane After passing through 2# film After passing through 3# membrane Suspended matter (mg / L) 53.5 8 20 17 Tropine content (%) 4.9 4.37 4.65 4.52 Turbidity (NTU) 19.2 0.5 1.5 1.2 Chromaticity (PCU) 33.3 11 22 18 SDI 12 3 5 4 ...

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Abstract

The invention relates to a method for recycling waste water resources from glycine production, which uses ceramic membranes to remove suspended solids, colloids, and impurities in waste water; uses a multi-stage nanofiltration system to separate and concentrate the catalyst urotropine for reuse, and uses a deamination membrane system After deep removal of high-concentration ammonia nitrogen, the effluent is biochemically treated. This treatment method can effectively separate resource components such as tropin, remove biochemical toxic components such as ammonia nitrogen, and carry out back-end biochemical treatment of the treated wastewater containing high carbon sources, so as to economically and reasonably solve this type of high-pollutant wastewater The processing problem, and the technological process is simple, easy to industrialize, and has broad prospects for popularization and application.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to the treatment of pesticide wastewater, that is, a method for recycling wastewater resources from glycine production. Background technique [0002] Glycine, also known as aminoacetic acid, is an important raw material for medicine, pesticide, organic synthesis and biochemical research, and is also a very important organic synthesis intermediate. At present, the production method of glycine in China mainly adopts the traditional ammonolysis method of chloroacetic acid, and its main raw material is chlorine Acetic acid, liquid ammonia, and urotropine. The waste liquid produced by this method contains a large amount of ammonium chloride, urotropine, ammonia nitrogen, formaldehyde and methanol. The secondary steam condenses in the process of evaporating and recovering ammonium chloride. There are still a large amount of ammonia nitrogen, methanol and a certain amoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/44C02F1/66C02F1/20C01C1/24C02F101/16
CPCC02F1/442C02F1/444C02F1/66C02F1/20C01C1/24C02F2101/16C02F2303/14
Inventor 李永刚崔建宇袁木平杨超龙刘超宇屠宏飞张波郑巍刘舜毛智强
Owner 湖北兴发环保科技有限公司
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