Advanced treatment method for beta-naphthol wastewater

A technology for advanced treatment of waste water, applied in the field of chemical treatment, can solve the problems of low concentration of suspended solids, high operating costs, high cost of chemicals, etc., achieve strong corrosion resistance, good treatment effect, and increase the effect of surface-to-body ratio

Inactive Publication Date: 2012-06-20
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the treatment rate and treatment qualification rate of β-naphthol production wastewater are very low, so the treatment task is very arduous
Especially after biochemical-physicochemical treatment, the biodegradability of the tail water is poor, the concentration of suspended solids is low, and the main refractory biodegradable substances in the wastewater
The use of traditional physicochemical or biochemical treatment processes has little effect on the reduction of tail water COD
How

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Two 2×5cm DSA electrodes are used as anodes, a stainless steel sheet of the same size is used as cathodes, and the distance between electrodes is 1cm. Electrochemical oxidation is used to treat β-naphthol wastewater with a COD of 1051.9mg L -1 , pH is 10 (original water sample pH), adding 1.0wt.% Na 2 SO 4 Supporting electrolyte with a current density of 25mA cm -2 , The reaction lasted 3h. Samples were taken from the reactor every 0.5h to analyze the UV-Vis and COD values. The experimental results are shown in Table 1. It can be seen from the results that when the reaction lasted for 2 hours, the gradient of the absorption peak in the ultraviolet spectrum decreased not obviously, and the removal rate of COD did not change much, so the reaction time was selected as 2 hours.

[0026] Table 1 Changes in COD of electrochemical advanced treatment of β-naphthol wastewater at different times

[0027]

Embodiment 2

[0029] Two 2×5cm DSA electrodes are used as anodes, a stainless steel sheet of the same size is used as cathodes, and the distance between electrodes is 1cm. Electrochemical oxidation is used to treat β-naphthol wastewater with a COD of 1051.9mg L -1 , pH is 9, adding 1.0wt.% Na 2 SO 4 supporting electrolyte with a current density of 20mA cm -2 、25mA cm -2 、30mA cm -2 、35mA cm -2 and 40mA cm -2 , The reaction lasted 2h. In the experimental results, we found that their corresponding COD values ​​are 256.9mg L -1 , 220.2 mg L -1 , 177.3mg L -1 , 156.5mg L -1 and 139.8 mg L -1 . When the current is 30mA cm -2 , the COD removal rate has little change trend, so the current density is selected as 30mA cm -2 .

Embodiment 3

[0031] Two 2×5cm DSA electrodes are used as anodes, a stainless steel sheet of the same size is used as cathodes, and the distance between electrodes is 1cm. The electrochemical oxidation advanced treatment of β-naphthol wastewater, COD is 1124.4mg L -1 , pH were 3, 5, 7, 9 and 11 respectively, adding 1.0wt.% Na 2 SO 4 Supporting electrolyte with a current density of 30mA cm -2 , The reaction lasted 2h. In the experimental results, we found that their corresponding COD values ​​are 230.3mg L -1 , 171.7mg L -1 , 191.5mg L -1 , 139.3 mg L -1 and 189.8mgL -1 . When pH=9, the COD removal rate is the highest under other conditions unchanged, so the optimum pH is chosen as 9.

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Abstract

The invention discloses a chemical treatment method, and in particular relates to an advanced treatment or recycling method for naphthalene series dye intermediate production wastewater. The method is suitable for the advanced treatment or recycling of beta-naphthol wastewater subjected to biochemical-physicochemical treatment. In a single-chamber reactor in which a dimensionally stable anode (DSA) electrode is taken as a cathode material, a stainless steel sheet with the same size as the DSA electrode is taken as a cathode and a distance between electrodes is 1cm, 1.0 to 5.0 weight percent of particle electrode material is added and the wastewater is treated for less than 1 hour under the conditions that current density is 20 to 50mA cm<-2> and pH is 3 to 11. The method has the advantages that: the oxidation capacity and corrosion resistance are high, the treatment effect is good, treatment time is short, pollution is avoided, and the like. The method can be widely applied to dye production enterprises.

Description

technical field [0001] The invention relates to a chemical treatment method, in particular to a method for advanced treatment or reuse of waste water produced by naphthalene dye intermediates, which is suitable for advanced treatment or recycling of β-naphthol tail water after biochemical-physicochemical treatment. use. technical background [0002] β-naphthol, also known as 2-naphthol and ethyl naphthol, is an important organic chemical raw material and dye intermediate, mainly used in dyes, organic pigments, rubber antioxidants, and pharmaceutical and pesticide industries. At present, refined naphthalene is mostly used as raw material in China, and β-naphthol is produced by the traditional sulfonated alkali fusion method, and a large amount of waste water is discharged during the production process. Wastewater has high concentration, high toxicity, deep color, strong acid-base buffering ability, and is difficult to biochemically degrade, causing great harm to human body a...

Claims

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Application Information

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IPC IPC(8): C02F1/46
Inventor 陈锋涛
Owner ZHEJIANG SCI-TECH UNIV
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