Treatment of chemical cleaning wastewater and cost optimization by response surface methodology coupled nonlinear programming.
The real alkaline cleaning wastewater (ACW) was treated by a process consisting of neutralization, NaClO oxidation and aluminum sulfate (AS) coagulation, and a novel response surface methodology coupled nonlinear programming (RSM-NLP) approach was developed and used to optimize the oxidation-coagula...
| Published in: | Journal of Environmental Management Vol. 198; pp. 12 - 21 |
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| Main Authors: | , , , , , , |
| Format: | Article |
| Published: |
Academic Press Inc.
Aug2017 Part 2
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=123269196&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 123269196 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 03014797 EMJ jtl: Journal of Environmental Management issn: 03014797 maglogo: N pubinfo: dt: Aug2017 Part 2 vid: 198 pid: 735 pub: Academic Press Inc. artinfo: ui: 123269196 10.1016/j.jenvman.2017.05.009 ppf: 12 ppct: 9 formats: tig: atl: Treatment of chemical cleaning wastewater and cost optimization by response surface methodology coupled nonlinear programming. aug: au: Yang, Yang Zhou, Zhen Lu, Chenjie Chen, Yunke Ge, Honghua Wang, Libing Cheng, Cheng affil: College of Environmental and Chemical Engineering, Shanghai University of Electric Power, 2588 Changyang Road, Shanghai, 200090, China Shanghai Ahill Chemical Products Co., Ltd, 1038 Guoshun Road, Shanghai, 200090, China su: Wastewater treatment Chemical cleaning Coagulation (Sewage purification) Aluminum sulfate Nonlinear programming Response surfaces (Statistics) sug: subj: Other Basic Inorganic Chemical Manufacturing All other basic inorganic chemical manufacturing Sewage Treatment Facilities Wastewater treatment Chemical cleaning Coagulation (Sewage purification) Aluminum sulfate Nonlinear programming Response surfaces (Statistics) keyword: Cleaning wastewater Coagulation NaClO oxidation Neutralization Response surface methodology Cleaning wastewater Coagulation NaClO oxidation Neutralization Response surface methodology ab: The real alkaline cleaning wastewater (ACW) was treated by a process consisting of neutralization, NaClO oxidation and aluminum sulfate (AS) coagulation, and a novel response surface methodology coupled nonlinear programming (RSM-NLP) approach was developed and used to optimize the oxidation-coagulation process under constraints of relevant discharge standards. Sulfuric acid neutralization effectively removed chemical oxygen demand (COD), surfactant alkylphenol ethoxylates (OP-10) and silicate at the optimum pH of 7.0, with efficiencies of 62.3%, >82.7% and 94.2%, respectively. Coagulation and adsorption by colloidal hydrated silica formed during neutralization were the major removal mechanisms. NaClO oxidation achieved almost complete removal of COD, but was ineffective for the removal of surfactant OP-10. AS coagulation followed by oxidation can efficiently remove OP-10 with the formation of Si-O-Al compounds. The optimum conditions for COD ≤100 mg/L were obtained at hypochlorite to COD molar ratio of 2.25, pH of 10.0 and AS dosage of 0.65 g Al/L, with minimum cost of 9.58 $/m 3 ACW. This study shows that the integrative RSM-NLP approach could effectively optimize the oxidation-coagulation process, and is attractive for techno-economic optimization of systems with multiple factors and threshold requirements for response variables. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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