Isolation and Identification of Bacteria from Wastewater Collected in Nakhon Pathom Province, Thailand, and Evaluation of Amylase, Protease, and Lipase Production
Maytiya Konkit, Yanika Wacharatewinkul, Wasana Naiumsawang, Wanatchaporn Boontham, Kanya Sornsanit, Kroekkai Janngam, Thongchai Srimuang and Wasu Pathom-aree* Author for corresponding; e-mail address: wasu.p@cmu.ac.th
Volume: Vol.52 No.4 (July 2025)
Research Article
DOI: https://doi.org/10.12982/CMJS.2025.051
Received: 16 January 2025, Revised: 13 May 2025, Accepted: 21 May 2025, Published: 4 July 2025
Citation: Konkit M., Wacharatewinkul Y., Naiumsawang W., Boontham W., Sornsanit K., Janngam K., et al., Isolation and identification of bacteria from wastewater collected in Nakhon Pathom province, Thailand, and evaluation ofamylase, protease, and lipase production. Chiang Mai Journal of Science, 2025; 52(4): e2025051. DOI 10.12982/CMJS.2025.051.
Graphical Abstract
Abstract
The large volume of wastewater produced by food factories in western Thailand has increasingly impacted the ecosystem. This study aimed to isolate lipid-degrading bacteria from household and industrial wastewater in Nakhon Pathom Province, Thailand, and to treat oil-contaminated wastewater from a vitamin E manufacturing plant under aerobic conditions. Out of 120 isolates, two strains (1W51 and 1W52) were selected for their strong ability to degrade lipids, as demonstrated on tributyrin media. 16S rRNA sequencing identified strains 1W51 and 1W52 as closely related to Bacillus nitratireducens and Bacillus paranthracis, respectively. Both strains produced hydrolytic enzymes including amylase, protease, and lipase on selective media. They also demonstrated beta-hemolysis, positive drop collapse results, and clear halo zones in oil displacement tests. The emulsification index (E24) of both strains exceeded 50%. After treatment with these strains, the chemical parameters in wastewater showed notable improvement: total suspended solids (TSS) and chemical oxygen demand (COD) decreased by 50% and 75%, respectively, while dissolved oxygen (DO) and biological oxygen demand (BOD) increased by 67% and 73%, respectively. The addition of B. nitratireducens 1W51 and B. paranthracis 1W52 significantly improved wastewater quality, indicating their potential for use in environmentally friendly biological wastewater treatment.
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Somkid Deejing* [a,b], Mitsuaki Moriguchi [c], Naiyatat Poosaran [d], Griangsak Chairote [e] and Sa
Vol.32 No.2 (MAY 2005)Research Article View: 1,536 Download: 262
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Jeerapun Jaiinphon, Kreuawan Thonglem and Wasu Pathom-aree*
Vol.29 No.3 (DECEMBER 2002)Research Article View: 1,071 Download: 265
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Yuwadee Peerapornpisal*, Wanchai Sonthichai, Morakot Sukchotiratana, Suwiwek Lipigorngoson, Werawan Ruangyuttikarn, Komson Ruangrit, Jeeraporn Pekkoh, Rattapoom Prommana, Nopparut Panuvanitchakorn, Neti Ngearnpat, Siripong Kiatpradab, Sakorn Promkutkaew
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Atchara Lapmak [a], Sumana Kumpai [b] and Abhinya Plikomol*[b]
Vol.28 No.2 (DECEMBER 2001)Opinion View: 1,118 Download: 278