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Environment-friendly treatment method of caustic-soda-containing sodium hypochlorite waste liquor

A sodium hypochlorite, environmental protection treatment technology, applied in gaseous discharge wastewater treatment, filtration treatment, water/sewage treatment and other directions, can solve the problems of large acid and reducing agent, increase wastewater treatment investment, treatment operation cost, consumption, etc., achieve considerable Economic benefits, good environmental benefits, and cost reduction effects

Active Publication Date: 2015-04-01
东营市广利临港产业园有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of using sodium hypochlorite waste liquid as waste water treatment both consumes a large amount of acid and reducing agent, increases waste water treatment investment and treatment operating costs, and cannot make sodium hydroxide, sodium chlorate and sodium chloride in waste liquid be used effectively

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The environmental protection treatment method that contains caustic soda sodium hypochlorite waste liquid, comprises the steps:

[0028] (1) 1000kg of sodium hypochlorite waste liquid containing caustic soda (indicator as shown in table 1) before the treatment is heated to boiling, and carries out evaporation and concentration for the first time under normal pressure, and NaClO is decomposed into NaCl and NaClO in the evaporation and concentration process 3 ;

[0029] (2) evaporating and concentrating to 16.91% by weight of NaOH in the waste liquid (see Table 1 for the specific index of the waste liquid), a large amount of NaCl crystallization occurs, and the waste liquid containing NaCl crystallization is squeezed into the underflow filter press filter with a delivery pump while it is hot, Thereby removing NaCl solid;

[0030] (3) the filtered filtrate is heated to boiling again, and continues to be evaporated and concentrated for the second time under normal pressure...

Embodiment 2

[0040] The environmental protection treatment method that contains caustic soda sodium hypochlorite waste liquid, comprises the steps:

[0041] (1) Heat 1000kg of sodium hypochlorite waste liquid containing caustic soda (indicators as shown in Table 2) before treatment to 80°C, and carry out evaporation and concentration for the first time under normal pressure, and NaClO is decomposed into NaCl and NaClO during evaporation and concentration 3 ;

[0042] (2) be concentrated to the NaOH weight percentage in the waste liquid and be 19.67% (the concrete index of waste liquid is shown in Table 2), a large amount of NaCl crystallizations are arranged, and the waste liquid containing NaCl crystallization is squeezed into the underflow filter press filter with delivery pump while it is hot, Thereby removing NaCl solid;

[0043] (3) The filtered filtrate is heated to 80°C again for the second evaporation and concentration, and it is concentrated to 27.89% by weight of NaOH (see Table...

Embodiment 3

[0054] The environmental protection treatment method that contains caustic soda sodium hypochlorite waste liquid, comprises the steps:

[0055] (1) 1000kg of sodium hypochlorite waste liquid containing caustic soda before treatment (indicator as shown in table 3) is heated to boiling, and carries out evaporation and concentration for the first time under -0.1~0MPa vacuum condition, and NaClO is decomposed into NaCl and NaCl in the evaporation and concentration process NaClO 3 ;

[0056] (2) NaOH weight percentage is 15.88% (the specific index of waste liquid is shown in Table 3) in the waste liquid evaporated and concentrated, and a large amount of NaCl crystallizations are arranged, and the waste liquid containing NaCl crystallization is squeezed into the underflow filter press filter with delivery pump while it is hot , thereby removing NaCl solid;

[0057] (3) The filtered filtrate is heated to boiling again, and continues to be evaporated and concentrated for the second ...

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Abstract

The invention discloses an environment-friendly treatment method of caustic-soda-containing sodium hypochlorite waste liquor. A NaOH solution can form caustic-soda-containing sodium hypochlorite waste liquor after absorbing chlorine waste gas. The method comprises the following steps: the waste liquor is concentrated at 80 DEG C above, whereinNaClO is decomposed into NaCl and NaClO3 in the concentration process; the NaCl crystal is precipitated and removed by filtering; the filtered caustic-soda-containing waste liquor flows back and continues absorbing the chlorine waste gas; the obtained waste liquor is subjected to the operation above repeatedly until the NaClO3 concentration is saturated in the waste liquor; the NaClO3 crystal is precipitated and removed by filtering at 20-25 DEG C; and the filtered caustic-soda-containing waste liquor is subjected to cyclic use continuously. The NaCl and NaClO3 obtained in the treatment process can be used as chemical raw materials after being treated. The method has the advantages of low equipment investment and simple technique, and is easy to operate; and the cyclic utilization of the sodium hydroxide can greatly lower the cost for absorbing waste chlorine gas, thereby saving the wastewater treatment cost of the enterprise and lowering the environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an environment-friendly treatment method for waste liquid containing caustic soda and sodium hypochlorite. Background technique [0002] Chlorine gas is a highly toxic gas. In the chlor-alkali industry and chemical companies using chlorine gas, a large amount of chlorine gas waste gas is produced, which causes serious harm to the environment and human body. The currently commonly used method for removing chlorine gas is to absorb chlorine gas into an alkaline solution containing sodium hypochlorite with a NaOH solution of about 15% to 20% by weight, and then treat the sodium hypochlorite waste liquid as waste water and discharge it after reaching the standard. This method of using sodium hypochlorite waste liquid as waste water treatment both consumes a large amount of acid and reducing agent, increases waste water treatment investment and treatment operatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/18
CPCC02F1/001C02F1/04C02F1/5209C02F9/00C02F2001/5218C02F2103/18
Inventor 陈钢
Owner 东营市广利临港产业园有限公司
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