喷雾干燥法在高盐有机废水中无机盐回收和有机质分解的应用研究

doi:10.19964/j.issn.1006-4990.2023-0551

Abstract

Abstract:

In this study，the spray⁃drying process was used to treat dissolved organic pollutants and inorganic salts in high⁃salt organic wastewater.The recovery of inorganic salts and the decomposition properties of organic matter at each temperature of the process were revealed.The analysis results of the product powder by SEM，FT-IR and 3D-EEMs showed that during the heating and evaporation process in the atomization chamber，macromolecular refractory substances such as humic acid containing hydrophilic groups（hydroxyl and dcarbonyl groups） combined with inorganic salts such as NaCl and Na₂SO₄ to form open hollow spherical shell structure particles.The particle size of the powder was distributed between 1.25 and 3.85 µm.After spray⁃drying and cyclone separation，white powders were obtained from wastewater，which was burned at 600 ℃，all the refractory organic matter in it could be completely removed，and the burning loss rate was 6.23%.AAs and XRD analysis of the burned mixed salt showed that most of the metal elements such as Na⁺ and K⁺ in the original wastewater were reserved for further recycling after salt separation.Under the optimal process conditions（0.2 MPa+140 ℃），the decomposition and transformation efficiency of organic matter was as high as 93.1%，and the degradation rate of eutrophication pollutants such as dissolved organic carbon，ammonia nitrogen，total nitrogen and total phosphorus in water was over 64.7%，the total recovery rate of inorganic salt was 87.2%，which provided a new idea for the comprehensive disposal and clean utilization of high⁃salt wastewater.

Key words: spray?drying process, high?salt organic wastewater, organic matter decomposition, inorganic salt recovery

CLC Number:

X703

YUAN Yaosen, LI Enze, LÜ Hongzhou, SONG Yipeng, YANG Chengli, LI Juanjuan. Study on application of spray⁃drying method in inorganic salt recovery and organic matter decomposition in high salt organic wastewater[J]. Inorganic Chemicals Industry, 2024, 56(8): 83-91.

Figures/Tables 11

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浊度/NTU	pH	COD_Cr/（g·L^-1）	DOC/（g·L^-1）	TDS/（g·L^-1）	NH₃-N/（g·L^-1）
124	6.7	26.0	4.3	100.3	2.1
TN/（g·L^-1）	TP/（g·L^-1）	ρ（Na）/（g·L^-1）	ρ（K）/（g·L^-1）	ρ（Cu）/（mg·L^-1）	UV₂₅₄/cm^-1
9.8	61.4	28.9	1.2	14.6	1.1

温度/℃	收率/（g·L^-1）	温度/℃	收率/（g·L^-1）
80	41.31	170	33.95
110	29.22	200	49.38
140	43.83	230	32.82

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Study on application of spray⁃drying method in inorganic salt recovery and organic matter decomposition in high salt organic wastewater

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