印染反渗透浓水中碳酸钠的资源化回用技术研究

doi:10.19964/j.issn.1006-4990.2024-0611

Abstract

Abstract:

The concentrated water from the reverse osmosis（RO） process in the dyeing and printing industry is characterized by high organic content，high alkalinity，and complex salt composition.The main inorganic salts in it are a complex system of sodium sulfate（Na₂SO₄），sodium carbonate（Na₂CO₃），and sodium bicarbonate（NaHCO₃）.In response to the current situation where the technology for recovering sodium sulfate was mature but the resource utilization of high⁃value sodium carbonate was insufficient，an integrated process of "ultrafiltration（UF）+advanced oxidation process（AOP） with ozone+nanofiltration（NF）" was innovatively used to focus on the separation and recovery of sodium carbonate from the complex system.The results showed that the "UF+AOP" pretreatment stage achieved a color removal rate of 98.87% and a COD removal rate of 88.91%，effectively ensuring the stable operation of the NF system.After adjusting the pH by adding acid to convert CO₃^2- to HCO₃^-，the NF system，operating at 1.6 MPa，it reached a rejection rate of 93.42% for SO₄^2- and 16.78% for HCO₃^-.By adjusting the pH with alkali to convert HCO₃^- back to CO₃^2-，the separation of Na₂SO₄ and NaHCO₃ was achieved.The process verification indicated that the entire system operated stably and reliably.This study had established a new method for the selective recovery of valuable inorganic salts from dyeing and printing RO concentrated water，providing a solution with engineering application value for the textile and dyeing industry to achieve zero wastewater discharge and resource recycling，with significant environmental and economic benefits.

Key words: reverse osmosis concentrated water, high alkalinity, advanced oxidation of ozone, nanofiltration, sodium carbonate

CLC Number:

X791

WANG Xihui, WANG Haitao, XU Yinong, CHEN Donggen, LIU Peng, CHEN Dongmei, REN Qicheng, LI Zhonghua, CHANG Na. Study on resourceful reuse technology of sodium carbonate in concentrated water of reverse osmosis for textile dyeing and printing[J]. Inorganic Chemicals Industry, 2026, 58(1): 84-91.

Figures/Tables 12

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项目	加酸速率/ （mL∙min^-1）	投加量/ mL	ρ（CO₃^2-）/ （mg∙L^-1）	ρ（HCO₃^-）/ （mg∙L^-1）	总碱度/ （mg∙L^-1）
原水			1 431.25	1 325.83	2 757.08
实验1	0.84	4.2	47.86	2 679.74	2 727.60
实验2	3.25	4.3	50.15	2 464.56	2 514.61
实验3	6.68	4.3	49.34	2 459.63	2 508.97
实验4	9.79	4.2	49.96	2 392.85	2 442.81

项目	加碱速率/ （mL∙min^-1）	投加量/ mL	ρ（CO₃^2-）/ （mg∙L^-1）	ρ（HCO₃^-）/ （mg∙L^-1）
原水			12.41	2 048.52
实验1	3.6	22.1	1 996.21	68.32
实验2	8.4	21.8	1 986.56	72.15
实验3	10.8	22.2	1 981.53	75.31
实验4	17.9	22.1	1 988.65	73.83

项目	色度/ 度	COD/ （mg∙L^-1）	pH	ρ（SO₄^2-）/ （mg∙L^-1）	ρ（CO₃^2-）/ （mg∙L^-1）	ρ（HCO₃^-）/ （mg∙L^-1）
RO浓水	1 678.41	516.02	9.2	12 335.13	1 501.34	1 315.82
卷式超滤	61.51	79.31	8.6	12 287.81	1 426.52	1 313.81
臭氧曝气	18.92	57.21	9.4	12 160.61	1 434.12	1 326.33
加酸调节pH	18.91	55.13	8.2	12 189.71	49.85	2 459.71
纳滤淡水	7.92	19.31	8.8	802.09	12.39	2 046.97
加碱回调pH	7.91	17.82	10.2	802.31	1 996.23	68.32

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on resourceful reuse technology of sodium carbonate in concentrated water of reverse osmosis for textile dyeing and printing

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