Modification of commercial forward osmosis membranes and investigation on treatment of coking wastewater

doi:10.11949/0438-1157.20190670

Abstract

Abstract:

Forward osmosis technology is an emerging membrane separation technology and has broad application prospects in the treatment of organic wastewater. In this paper, the Poten and HTI commercial forward osmosis membranes were modified and used for the rejection of refractory toxic small molecules (indole and pyridine) in coking wastewater. The effects of PIP concentration, membrane orientation and draw solution concentration on the membrane water flux, J_s/J_wratio and organic matter rejection before and after modification, and the changes of the membrane characteristic parameters before and after modification were investigated. The results show that the membrane water flux and the J_s/J_w ratio are reduced to different degrees after the interfacial polymerization modification of the Poten membrane and the HTI membrane. The water permeability coefficient A and the salt permeability coefficient B of the modified two forward osmosis membranes were both reduced. The membrane structure parameter S and the rejection of NaCl and organic matters were improved; the rejection of organic matter by HTI-IP composite membrane (81%) was significantly higher than that of IP-2 composite membrane; compared with FO mode, IP-2 composite membrane had higher water flux and reverse salt flux in PRO mode. In addition, both water flux and reverse salt flux increase with increasing draw solution concentration in different membrane orientations, but in FO mode, membrane flux exhibits a non-linear increase.

Key words: forward osmosis membrane, coking wastewater, modification, interfacial polymerization

摘要：

正渗透技术是一种新兴的膜分离技术，在处理有机废水方面具有广阔的应用前景。分别对Poten以及HTI商业正渗透膜进行改性，并用于对焦化废水中难降解毒性小分子(吲哚和吡啶)的截留测试。探究了水相单体PIP浓度、膜朝向、汲取液浓度对改性前后两种膜水通量、J_s/J_w比值、有机物截留率的影响，以及改性前后两膜特征参数的变化。结果表明：对Poten膜和HTI膜进行界面聚合改性后，膜水通量以及J_s/J_w比值都不同程度地降低；改性后的两正渗透膜水渗透系数A、盐渗透系数B均降低，而膜结构参数S以及对NaCl和有机物的截留率均提高；其中HTI-IP复合膜对有机物的截留率(81%)明显高于IP-2(改性Poten膜)复合膜；与FO模式相比，IP-2复合膜在PRO模式下(汲取液面向活性层)具有更高的水通量及反向盐通量。此外，在两种膜朝向下，水通量及反向盐通量都随汲取液浓度的增大而增大，但是在FO模式下(料液面向活性层)，通量呈现非线性增长。

关键词: 正渗透膜, 焦化废水, 改性, 界面聚合

CLC Number:

TQ 028

Zhiqiang LI, Na LYU, Lanying JIANG. Modification of commercial forward osmosis membranes and investigation on treatment of coking wastewater[J]. CIESC Journal, 2020, 71(S1): 461-470.

李志强, 吕娜, 蒋兰英. 商业正渗透膜的改性及其用于处理焦化废水的研究[J]. 化工学报, 2020, 71(S1): 461-470.

Figures/Tables 17

Table 1 Composition of simulated coking wastewater(pH=7.5)

成分	浓度/(mg/L)
吲哚	50
吡啶	50
NH₃-N	80
COD	146

Fig.1 Self-made frame interface polymerization device

Fig.2 Schematic of interfacial polymerization reaction of Poten membrane

Fig.3 Principle of HTI membrane interfacial polymerization reaction

Fig.4 Schematic of forward osmosis process

Fig.5 Lab-made reverse osmosis equipment

Fig.6 Effect of PIP monomer concentration on FO performance of Poten membrane

Fig.7 SEM images of Poten membrane after modification of different PIP concentrations

Fig.8 AFM results of Poten membrane after modification of different PIP concentrations

Fig.9 Contact angle change of Poten membrane after modification of different PIP concentrations

Fig.10 FO performance(a) and contact angle (b) change of HTI membrane before and after modification

Fig.11 SEM images of HTI membrane before and after modification

Fig.12 AFM results of HTI membrane before and after modification

Table 2 Test results of characteristic parameters of FO membrane before and after modification

样品	A/(kg/(m²·h·bar))	B/(kg/(m²·h))	S/μm	R/%
PIP-0	7.64	0.264	882	87.2
PIP-2	5.43	0.071	1543	94.7
HTI	0.36	0.0035	278	93.0
HTI-IP	0.33	0.0011	581	98.0

Fig.13 Changes in organic matter rejection of two FO membranes before and after modification

Fig.14 PIP-2 membrane flux change with draw solution concentration (FO mode)

Fig.15 PIP-2 membrane flux change with draw solution concentration (PRO mode)

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