钛盐混凝剂深度去除乳化油的性能及机理研究

doi:10.19964/j.issn.1006-4990.2024-0162

摘要/Abstract

摘要：

含油废水中乳化油因其粒径小、稳定性高等特点较难去除，使得废水处理难度加大。混凝法在乳化油处理中应用广泛，但传统的铁、铝盐混凝剂存在产生的絮体小、生成速度慢、难以实现油水快速分离的问题，导致深度除油效果不佳。新型钛盐混凝剂因混凝性能突出有望解决铁铝盐混凝剂应用问题。以润滑油、大豆油、石油醚和柴油4种模拟乳化油水为处理对象，选用聚合硫酸铁（PFS）和聚氯化铝（PAC）为对照，评价钛凝胶混凝剂（TXC）处理含油废水的可行性。结果表明，TXC对乳化油废水具有优于PFS和PAC的混凝效果。以润滑油模拟废水为例，在初始pH范围为3~11、投加量为1~60 mg/L和含油量为500~2 000 mg/L条件下，TXC的除油率最高可达91.526%，优于PFS和PAC。经TXC混凝后出水浊度均小于1 NTU，且油的粒径最小，表明TXC具有深度除油的应用潜力。絮体表征结果表明，TXC主要通过网捕卷扫作用除油，得益于其大尺寸的网状水解物，TXC絮体更易于去除小粒径油滴。该研究结果为含油特别是乳化油废水的处理提供新的思路。

关键词: 乳化油, 混凝, 除油, 粒径, 钛混凝剂

Abstract:

Emulsified oil is more difficult to be removed because of its small particle size and difficult to be agglomerated.Coagulation is widely used in the treatment of emulsified oil.However，the traditional iron and aluminum salt coagulants produce small flocs and have slow generation rate，which make it difficult to realize the rapid separation of oil and water，resulting in poor deep oil removal effect.The new titanium salt coagulant is expected to solve the application problem of iron aluminum salt coagulant due to its outstanding coagulation performance.In this paper，a new type of titanium gel coagulant（TXC） for the treatment of oily wastewater was evaluated by using four kinds of simulated emulsified oil water，such as lubricating oil，soybean oil，petroleum ether and diesel oil，and choosing polyferric sulfate（PFS） and polyaluminum chloride（PAC） as the control.The results showed that TXC had better coagulation effect on emulsified oil wastewater than PFS and PAC.Taking lubricating oil as an example，in the initial pH range of 3~11，dosage of 1~60 mg/L and oil content of 500~2 000 mg/L，the oil removal rate of TXC was up to 91.526%.It was better than PFS and PAC.The turbidity of the oil-bearing wastewater after TXC coagulation was less than 1 NTU，and the particle size of the oil was the smallest，which indicated that TXC had the application potential of deep oil removal.The results of floc characterization showed that TXC mainly removed oil by net sweeping，and because of its large floc size，it was easier to remove small particle size oil droplets.The research results provided new ideas for the treatment of oily wastewater，especially emulsified oil wastewater.

Key words: emulsified oil, coagulation, oil removal, particle size, titanium coagulant

中图分类号:

X703

黄天寅, 孙凌, 赵勤政, 陈新, 宋孝杰, 吴兵党. 钛盐混凝剂深度去除乳化油的性能及机理研究[J]. 无机盐工业, 2025, 57(2): 68-75.

HUANG Tianyin, SUN Ling, ZHAO Qinzheng, CHEN Xin, SONG Xiaojie, WU Bingdang. Study on performance and mechanism of titanium salt coagulant for treatment of oily wastewater[J]. Inorganic Chemicals Industry, 2025, 57(2): 68-75.

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	初始含油量/（mg·L^-1）	初始浊度/NTU	初始pH
润滑油	500	20.9	6.76
	1 000	36.2	6.64
	2 000	79.5	5.84
大豆油	500	23.9	7.49
	1 000	34.8	7.19
	2 000	55.4	6.64
石油醚	500	25.1	7.81
	1 000	58.4	7.46
	2 000	112.3	7.24
柴油	500	38.2	8.06
	1 000	70.6	7.62
	2 000	142.8	7.12

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