电化学法处理香料工业氯化钠有机废盐的研究

doi:10.19964/j.issn.1006-4990.2023-0268

Abstract

Abstract:

In order to achieve the resource utilization of sodium chloride organic waste salt，the sodium chloride organic waste salt from a spice enterprise was took as the research object，and a two-chamber electrolysis process for resource treatment of sodium chloride organic waste was proposed based on the single chamber electrochemical oxidation，which could obtain sodium hydroxide while degrading the organic matter in the waste salt.The electrochemical oxidation degradation conditions and pathways of organic compounds in waste salt were investigated in a single chamber electrolytic cell.The research results showed that under the optimal electrolysis conditions of current density of 600 A/m²，reaction temperature of 35 ℃，and initial pH of 6，after 8 h of electrolysis，the chemical oxygen demand（COD） removal rate of wastewater was 92.3%，the chroma removal rate was 100%，the current efficiency was 32.3%，respectively.The degradation pathways of organic pollutants were mainly through the indirect oxidation of active chlorine and hydroxyl radicals generated on the anode.By adjusting the pH of the anolyte and the feeding method，under the same electrolysis conditions，after 8 h of electrolysis，the COD removal rate of anode wastewater in the two-chamber process could reach 87.2%，and the total output of cathode sodium hydroxide could reach 11.33 g.This process had the characteristics of mild reaction conditions，simple process flow，and no secondary pollution.This study could provide reference for the resource utilization of sodium chloride organic waste salts.

Key words: electrochemistry, sodium chloride organic waste salt, degradation pathway of the organic matter, resource utilization

CLC Number:

TQ131.12

YAO Jiankang, HU Shuozhen, NIU Dongfang, WU Jianping, ZHANG Xinsheng. Study on electrochemical treatment of sodium chloride organic waste salt in spice industry[J]. Inorganic Chemicals Industry, 2024, 56(3): 105-115.

Figures/Tables 23

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电流密度/（A·m^-2）	电流效率/%	电流密度/（A·m^-2）	电流效率/%
300	49.2	600	32.3
400	39.4	700	28.0
500	35.4

反应温度/℃	活性氯含量/（mg/L）	反应温度/℃	活性氯含量/（mg/L）
25	3 300	45	1 700
35	2 160	55	1 300

pH₀	2 h的COD去除率/%	8 h的COD去除率/%
3	45.3	92.5
6	44.7	92.3
9	35.9	90.0
12	13.9	87.1

pH₀	R²	pH₀	R²
3	0.998	9	0.995
6	0.999	12	0.954

电解时间/h	c（NaOH）/（mol/L）	电解时间/h	c（NaOH）/（mol/L）
0	1.24	6	1.95
2	1.50	8	2.21
4	1.72

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on electrochemical treatment of sodium chloride organic waste salt in spice industry

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电解时间/h	pH
电解时间/h	电解一段时间后	添加NaOH时
0.5	3.0	6.2
2	4.1	6.2
4	4.2	6.1
6	4.0	6.0
8	4.1	6.0

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