Life cycle assessment on methods for polyhydroxyalkanoate extraction from aerobic granules

IF 3.1 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Rong Er Lim, Syahirah Faraheen Kabir Ahmad, Gobi Kanadasan and Vel Murugan Vadivelu
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Abstract

Aerobic granules were cultivated to accumulate polyhydroxyalkanoate (PHA) using palm oil mill effluent (POME) in a sequencing batch reactor (SBR). Five PHA extraction methods using different cell digestion chemicals, namely, sodium hypochlorite, acetone, sodium chloride, and sodium hydroxide, and without chemicals (control), were studied to identify the most environmentally friendly method and the most contributing factor within the methods. Method 1 (sodium hypochlorite) and method 2 (acetone) provided PHA yields of approximately 85% cell dry weight (CDW). The PHA that was recovered was a P3(HB-co-HV) co-polymer. SimaPro software version 8.5, developed by PRé Sustainability, was used to analyze the impact of the extraction methods on seven selected impact categories. Life cycle impact assessment of each of the methods for the production of 1 kg of dried PHA indicated that methods 1 (sodium hypochlorite) and 2 (acetone) had the lowest impact on all impact categories studied. It was found that the cultivation process of aerobic granules, electricity consumption, and usage of trichloromethane during PHA extraction were major contributors to all the impact categories.

Abstract Image

好氧颗粒中聚羟基烷酸酯提取方法的生命周期评价
在序批式反应器(SBR)中,利用棕榈油厂废水(POME)培养好氧颗粒以积累聚羟基烷酸酯(PHA)。研究了使用次氯酸钠、丙酮、氯化钠和氢氧化钠等不同细胞消化化学物质和不使用化学物质(对照)的5种PHA提取方法,以确定最环保的方法和方法中最大的影响因素。方法1(次氯酸钠)和方法2(丙酮)提供的PHA产量约为细胞干重(CDW)的85%。回收的PHA为P3(HB-co-HV)共聚物。采用pr Sustainability公司开发的SimaPro软件8.5版本,分析了提取方法对选定的七个影响类别的影响。对生产1 kg干PHA的每种方法进行的生命周期影响评估表明,方法1(次氯酸钠)和方法2(丙酮)对所研究的所有影响类别的影响最低。结果表明,好氧颗粒的培养过程、电力消耗和PHA提取过程中三氯甲烷的使用是影响各影响类别的主要因素。
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来源期刊
Environmental Science: Water Research & Technology
Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES
CiteScore
8.60
自引率
4.00%
发文量
206
期刊介绍: Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.
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