Investigation of the Efficiency of Dairy Wastewater Treatment Using Lipid-Degrading Bacterial Strains

2018 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2018-05-01 DOI:10.1109/MERCON.2018.8421973

Ayesha Sandaruwani, C. Kumarasinghe, D. Samarakoon, T. Ariyadasa, S. Gunawardena

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引用次数: 3

Abstract

Dairy industry is considered as the largest producer of wastewater in the food industry in many countries. Dairy wastewater contains high concentrations of nutrients, organic and inorganic constituent. Therefore, discharging untreated/partially treated dairy wastewater causes serious environmental problems. Biological treatment methods show the highest efficiency for treating dairy wastewater. Aim of the present study was to identify indigenous bacteria capable of degrading dairy wastewater efficiently. Bacterial isolates were tested individually and in combinations using synthetic wastewater medium, incubated at 30°C, for 2 days and Chemical Oxygen Demand (COD), pH, free fatty acid content, cell growth rate and the lipase activity were obtained at 6 hr time intervals for 36 hours. All the tested bacteria along with the consortium exhibited lipid degradation as well as removal of organic matter. Pseudomonas aeruginosa showed the highest activity in lipid degradation and COD reduction to 250mgO2/ltr at 12 hours.

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脂质降解菌对乳业废水处理效果的研究

在许多国家，乳品工业被认为是食品工业中产生废水最多的行业。乳业废水中含有高浓度的营养物质、有机和无机成分。因此，排放未经处理或部分处理的乳业废水会造成严重的环境问题。生物法处理乳制品废水的效率最高。本研究的目的是鉴定能够有效降解乳制品废水的本地细菌。采用合成废水培养基，在30°C条件下孵育2 d，对分离的细菌进行单独和组合试验，每隔6 h测定化学需氧量(COD)、pH、游离脂肪酸含量、细胞生长速率和脂肪酶活性，连续36 h。所有被测试的细菌以及联合体都表现出脂质降解和有机物的去除。铜绿假单胞菌在12 h时脂质降解活性最高，COD降至250mgO2/ltr。

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2018 Moratuwa Engineering Research Conference (MERCon)

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