混凝沉淀法处理冶金含氟废水工艺研究

doi:10.19964/j.issn.1006-4990.2023-0261

Abstract

Abstract:

The excessive fluorine content in water will cause great damage to the environment.At present，coagulant sedimentation method is widely used to treat fluorine-containing wastewater in metallurgical industry.Therefore，in view of the many influencing factors and the lack of comprehensive evaluation of the defluorination effect in coagulant sedimentation process，the fluorine-containing wastewater produced in the production process of a steel company was studied.Orthogonal experiments were designed to investigate the effects of pH，polyaluminum chloride（PAC） dosage，polyacrylamide（PAM） dosage，PAC stirring time and PAM stirring time on the defluorination efficiency of fluorine-containing wastewater.The research results indicated that the primary and secondary factors affecting defluorination efficiency were as follows：pH＞PAC stirring time＞PAC dosage＞PAM stirring time＞PAM dosage.In addition，the influence of the above factors and single factor changes such as temperature on the fluoride removal efficiency was studied.The results showed that defluorination efficiency under experimental conditions in this study was up to 99.3% when pH was 7，PAC dosage was 70 mL，PAM dosage was 2.5 mL，PAC stirring time was 15 min，PAM stirring time was 30 min，temperature was 30 ℃.In practical engineering applications，the total removal rate of fluoride ion by the coagulant sedimentation method was about 80%~90%，and the concentration of fluoride ion was about 7 mg/L.The results illustrated that the coagulant sedimentation method could satisfy the fluoride discharge standard.

Key words: coagulant sedimentation method, fluorine-containing wastewater, PAC, PAM

CLC Number:

X703

ZHU Zuoqiao, SHI Mengyuan, MAO Rui, GUO Haining, SU Yuao. Study on treatment process of metallurgical fluorine-containing wastewater by coagulant sedimentation method[J]. Inorganic Chemicals Industry, 2024, 56(4): 118-124.

Figures/Tables 10

Table 1

Table 2

Table 3

Calculation results of orthogonal experiment and range analysis of each parameter"

序号	pH	5%PAC投加量/mL	0.1%PAM投加量/mL	PAC搅拌时间/min	PAM搅拌时间/min	余氟含量/（mg·L^-1）
1	6	20	0.5	5	5	0.92
2	6	30	1.5	20	25	0.19
3	6	40	2.5	10	20	0.17
4	6	50	1	25	15	0.08
5	6	60	2	15	10	1.9
6	7	20	2.5	20	15	1.35
7	7	30	1	10	10	0.94
8	7	40	2	25	5	0.56
9	7	50	0.5	15	25	0.31
10	7	60	1.5	5	20	0.8
11	8	20	2	10	25	1.9
12	8	30	0.5	25	20	2.9
13	8	40	1.5	15	15	2.8
14	8	50	2.5	5	10	3.5
15	8	60	1	20	5	0.41
16	9	20	1.5	25	10	8.22
17	9	30	2.5	15	5	6.83
18	9	40	1	5	25	5
19	9	50	2	20	20	2.42
20	9	60	0.5	10	15	3.53
21	10	20	1	15	20	12
22	10	30	2	5	15	8.13
23	10	40	0.5	20	10	8.33
24	10	50	1.5	10	5	8.37
25	10	60	2.5	25	25	7.95
K-₁	0.65	4.88	3.20	3.67	3.42
K-₂	0.79	3.80	3.69	2.98	4.58
K-₃	2.30	3.37	4.08	4.77	3.18
K-₄	5.20	2.94	2.98	2.54	3.66
K-₅	8.96	2.92	3.96	3.94	3.07
$R$	8.31	1.96	1.1	2.23	1.51
影响主次：pH、PAC搅拌时间、PAC投加量、PAM搅拌时间、PAM投加量

Table 3

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

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Study on treatment process of metallurgical fluorine-containing wastewater by coagulant sedimentation method

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水平	pH	5%PAC投加量/mL	0.1%PAM 投加量/mL	PAC搅拌时间/min	PAM搅拌时间/min
水平1	6	20	0.5	5	5
水平2	7	30	1	10	10
水平3	8	40	1.5	15	15
水平4	9	50	2	20	20
水平5	10	60	2.5	25	25