Separation of ammonium salts from coking wastewater with nanofiltration combined with diafiltration

Na Yin; Gang Yang; Zhaoxiang Zhong; Weihong Xing

doi:10.1016/j.desal.2010.10.034

Separation of ammonium salts from coking wastewater with nanofiltration combined with diafiltration

Na Yin, Gang Yang, Zhaoxiang Zhong, Weihong Xing

College of Chemical Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

It is rather difficult to separate high concentration of ammonium thiosulfate from ammonium thiocyanate in coking wastewater which results in resources waste and environment pollution. In this work, a membrane process of nanofiltration (NF) was applied to solve the problem. The experimental results showed that the NF membrane selectively retained (NH₄)₂S₂O₃ with a rejection of 95.0% at a concentration of more than 60gL^-1. Meanwhile, the permeation of NH₄SCN was 120.0% at a concentration of nearly 120gL^-1. Diafiltration was optimized to ensure a high average salt rejection of 93.4% for (NH₄)₂S₂O₃. In addition, salt concentrations and yields can be predicted by theoretical calculation. The results reveal that the NF membranes are successful in separating high concentration of bi-component ammonium salt solutions into mono-component ones.

Original language	English
Pages (from-to)	233-237
Number of pages	5
Journal	Desalination
Volume	268
Issue number	1-3
DOIs	https://doi.org/10.1016/j.desal.2010.10.034
State	Published - 1 Mar 2011

Keywords

Ammonium salt
Coking wastewater
Diafiltration
Nanofiltration

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10.1016/j.desal.2010.10.034

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title = "Separation of ammonium salts from coking wastewater with nanofiltration combined with diafiltration",

abstract = "It is rather difficult to separate high concentration of ammonium thiosulfate from ammonium thiocyanate in coking wastewater which results in resources waste and environment pollution. In this work, a membrane process of nanofiltration (NF) was applied to solve the problem. The experimental results showed that the NF membrane selectively retained (NH4)2S2O3 with a rejection of 95.0% at a concentration of more than 60gL-1. Meanwhile, the permeation of NH4SCN was 120.0% at a concentration of nearly 120gL-1. Diafiltration was optimized to ensure a high average salt rejection of 93.4% for (NH4)2S2O3. In addition, salt concentrations and yields can be predicted by theoretical calculation. The results reveal that the NF membranes are successful in separating high concentration of bi-component ammonium salt solutions into mono-component ones.",

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AU - Yin, Na

AU - Yang, Gang

AU - Zhong, Zhaoxiang

AU - Xing, Weihong

PY - 2011/3/1

Y1 - 2011/3/1

N2 - It is rather difficult to separate high concentration of ammonium thiosulfate from ammonium thiocyanate in coking wastewater which results in resources waste and environment pollution. In this work, a membrane process of nanofiltration (NF) was applied to solve the problem. The experimental results showed that the NF membrane selectively retained (NH4)2S2O3 with a rejection of 95.0% at a concentration of more than 60gL-1. Meanwhile, the permeation of NH4SCN was 120.0% at a concentration of nearly 120gL-1. Diafiltration was optimized to ensure a high average salt rejection of 93.4% for (NH4)2S2O3. In addition, salt concentrations and yields can be predicted by theoretical calculation. The results reveal that the NF membranes are successful in separating high concentration of bi-component ammonium salt solutions into mono-component ones.

AB - It is rather difficult to separate high concentration of ammonium thiosulfate from ammonium thiocyanate in coking wastewater which results in resources waste and environment pollution. In this work, a membrane process of nanofiltration (NF) was applied to solve the problem. The experimental results showed that the NF membrane selectively retained (NH4)2S2O3 with a rejection of 95.0% at a concentration of more than 60gL-1. Meanwhile, the permeation of NH4SCN was 120.0% at a concentration of nearly 120gL-1. Diafiltration was optimized to ensure a high average salt rejection of 93.4% for (NH4)2S2O3. In addition, salt concentrations and yields can be predicted by theoretical calculation. The results reveal that the NF membranes are successful in separating high concentration of bi-component ammonium salt solutions into mono-component ones.

KW - Ammonium salt

KW - Coking wastewater

KW - Diafiltration

KW - Nanofiltration

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Separation of ammonium salts from coking wastewater with nanofiltration combined with diafiltration

Abstract

Keywords

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