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A comprehensive recovery and treatment method for H-acid industrial wastewater

A technology for industrial wastewater, recycling and treatment, applied in extraction water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. Excessive lye and other problems, to achieve the effect of up-to-standard discharge, low organic content, and reduced discharge

Active Publication Date: 2016-04-27
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the problems of high COD value of extracted water, large loss of extractant, excessive stripping lye, and direct discharge of high-salt wastewater in the treatment of H-acid industrial wastewater in the prior art, the present invention provides an H-acid industrial wastewater This method can achieve the COD value of the effluent to meet the takeover standard of the sewage treatment plant in the chemical industry park, the loss of the extractant is less than five ten thousandths (extraction of 10,000 tons of waste water loses 5 tons of extractant), and the organic matter in the waste water can be reused. During production, and through the MVR process, the by-product of sodium sulfate decahydrate is to achieve the full discharge of wastewater

Method used

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  • A comprehensive recovery and treatment method for H-acid industrial wastewater
  • A comprehensive recovery and treatment method for H-acid industrial wastewater

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Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As indicated by the middle arrow, the extractant is stored in the solvent tank 1, and the H-acid production wastewater is stored in the wastewater tank. The wastewater tank has a heating function. During operation, the wastewater tank can keep the temperature of the H-acid wastewater at 30-40°C. The pump lifts the waste water and the extractant to the static mixer 1, where the waste water and the extractant are fully mixed and then enters the oil-water separation tank 1. During continuous operation, the extractant flows into the solvent tank 2, and the extracted water enters the membrane separation device, passes through the membrane After the separation, the effluent enters the waste water tank, and the extractant after membrane separation enters the solvent tank 2. The extractant in the solvent tank 2 and the lye in the back extraction liquid tank are lifted to the static mixer 2 by the metering pump, and then mixed fully The liquid enters the oil-wat...

Embodiment 2

[0046] In this example, the H-acid wastewater of a printing and dyeing factory is treated, and the quality of the wastewater is shown in Table 2-1.

[0047] table 2-1

[0048] project

pH

COD (mg / L)

H acid content (mg / L)

Total salt content (mg / L)

H acid wastewater

2～3

20000

4000

330000

[0049] (1) Extraction

[0050] Take 500mL of H-acid wastewater, add 0.5mL of industrial sulfuric acid to adjust the pH to 1.5, heat it in a water bath to 40°C, add 500mL of extraction agent, mix the wastewater and extraction agent evenly, shake and extract for 5 minutes, and then stand for 5 minutes to separate the layers. The temperature of the extracted water was lowered to 34°C, and the extracted water was filtered through an ultrafiltration membrane at 0.5 MPa to intercept and enrich the extractant, and then the extracted water was transferred to a 1000mL distillation flask, and the lower extractant was retained in the separatory funn...

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Abstract

The invention discloses a comprehensive recovery treatment method for H acid industrial waste water, belonging to the field of an industrial waste water recovery treatment method. The comprehensive recovery treatment method comprises the steps of (1) after the pH value of H acid industrial waste water is regulated to 10-1.5, extracting by adopting a complexation extraction method so as to separate organic matters from waste water, filtering extraction water through a membrane so as to reduce the loss of an extractant, carrying out back extraction on the extractant by utilizing a 13% sodium hydroxide solution, wherein the ratio of the back-extraction oil to base is 4:1, and the recycling of the extractant and the enrichment of organic matters in the waste water can be realized; (2) after the back-extraction base liquid is saturated, directly recycling the back-extraction liquid into alkali fusion workshop section in H acid production, and further carrying out H acid production; (3) regulating the pH value of the extraction water to 6-9, concentrating and evaporating the extraction water by using MVR (Mechanical Vapor Recompression) technology, and recycling to obtain sodium sulfate. By combination use of extraction technology, membrane separation technology and MVR technology, the running cost can be saved, and the COD (Chemical Oxygen Demand) value of the evaporation water can achieve the administration standard of a sewage treatment plant in a chemical industrial park.

Description

technical field [0001] The invention belongs to the field of recovery and treatment methods of industrial wastewater, and more specifically relates to a comprehensive recovery and treatment method of H-acid industrial wastewater. Background technique [0002] H acid is one of the important dye intermediates, and a large amount of naphthalenesulfonic acid waste water is produced in its production process. The wastewater has high COD value, deep color, and pH=2. It is an organic wastewater with high concentration, high acidity, high salinity and high color. It is impossible to use traditional biochemical and physicochemical methods to treat it. How to separate the organic matter and inorganic salts has always been a difficult point in the treatment of H acid wastewater. [0003] At present, the treatment methods for such dye intermediate wastewater include adsorption method, concentration method, carbonization and incineration method, membrane separation method, freezing meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D5/00C02F1/66C02F1/26C02F1/44
Inventor 戴建军周腾腾王文文张洋阳
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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