铝盐混凝剂对地表水的混凝性能及残留铝形态研究

doi:10.19964/j.issn.1006-4990.2024-0145

Abstract

Abstract:

In order to deeply analyze the relationship between residual aluminum forms and coagulant types and water quality，the coagulation performance and residual aluminum forms of aluminum chloride（AlCl₃），aluminum sulfate［Al₂（SO₄）₃］，and polyaluminum chloride（PAC） on Yangcheng Lake water in Suzhou in summer and autumn，winter and spring were studied.Under the same dosage，the coagulation effect on surface water in summer and autumn from large to small was AlCl₃，Al₂（SO₄）₃，PAC，while in winter and spring，it from large to small was PAC，AlCl₃，Al₂（SO₄）₃.The analysis results of residual aluminum forms showed that the main form of residual aluminum in the three coagulants in summer，autumn，and winter and spring was total dissolved aluminum.The residual dissolved aluminum in the effluent accounted for about 40% to 80% of the total aluminum，and in winter and spring it accounted for about 30% to 90%.The proportion of soluble organic aluminum in total soluble aluminum was relatively large（about 80%~90% in summer and autumn，and about 50%~70% in winter and spring），while the content of soluble organic monomer aluminum was less than 10 μg/L，which could be ignored.Through correlation analysis，it was found that the total soluble aluminum in the residual aluminum component was greatly affected by the type of aluminum salt（correlation coefficient+0.996），and it had a strong correlation with turbidity，temperature，and organic matter in water quality.Based on the analysis of coagulation performance and residual aluminum forms，it was recommended to use AlCl₃ as a coagulant for the Yangcheng Lake water source in summer and autumn，with a dosage of 1.50~2.00 mg/L.It was recommended to use PAC in winter and spring，with a dosage of 1.00~1.50 mg/L and an optimal pH of 7.The relevant results provided technical support for the adaptability of aluminum salts in surface water of different water qualities.

Key words: aluminum salt coagulant, coagulation performance, residual aluminum, morphological distribution

CLC Number:

WU Wei, XU Cuiping, ZHAO Qinzheng, YANG Jingjing, XU Xiaoyi, HUANG Tianyin, WU Bingdang. Study on coagulation performance and residual aluminum forms of aluminum salt coagulants for surface water[J]. Inorganic Chemicals Industry, 2025, 57(1): 42-50.

Figures/Tables 10

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季节	时间	水温/ ℃	pH	浊度/ NTU	碱度/ （mg·L^-1）
夏秋季	2022-07	27.8~31.9	7.55~7.8	13~35	89~101
	2022-08	28.4~33.9	7.59~7.8	11~32	70~90
	2022-09	22.4~27.2	7.58~7.8	32~76	80~102
	2022-10	18.2~25.9	7.6~8	18~59	92~104
冬春季	2022-11	11.3~20	7.7~7.85	8.9~27	98~115
	2022-12	6.4~12.3	7.72~7.9	9.5~30	109~128
	2023-01	5.6~10.4	7.8~8	6.5~10.4	112~121
	2023-02	5.3~9	7.82~8	5.7~10	112~117

季节	混凝剂	ρ（总铝）/ （mg·L^-1）	ρ（总溶解性铝）/ （mg·L^-1）	ρ（溶解性单体铝）/ （mg·L^-1）	ρ（溶解性有机铝）/ （mg·L^-1）	ρ（溶解性有机单体铝）/（mg·L^-1）
夏秋季	PAC	0.234	0.159	0.048	0.128	0.001 3
	AlCl₃	0.222	0.129	0.053	0.120	0.025 0
	Al₂（SO₄）₃	0.307	0.129	0.074	0.118	0.006 9
冬春季	PAC	0.427	0.146	0.029	0.103	0.000 7
	AlCl₃	0.603	0.565	0.158	0.284	0.016 0
	Al₂（SO₄）₃	0.472	0.411	0.022	0.259	0.002 2

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Study on coagulation performance and residual aluminum forms of aluminum salt coagulants for surface water

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