Construction of oligotrophic compound microbial inoculants and their combined effect with functional carriers for remediation of micro-polluted source water

CAO Kai; LEI Yu; PENG Yuhong; XIE Yifei; SONG Leyou; DENG Yue; GAO Yuan; ZHANG Dan

doi:10.13205/j.hjgc.202507014

Volume 43 Issue 7

Jul. 2025

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CAO Kai, LEI Yu, PENG Yuhong, XIE Yifei, SONG Leyou, DENG Yue, GAO Yuan, ZHANG Dan. Construction of oligotrophic compound microbial inoculants and their combined effect with functional carriers for remediation of micro-polluted source water[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 125-133. doi: 10.13205/j.hjgc.202507014

Citation:

CAO Kai, LEI Yu, PENG Yuhong, XIE Yifei, SONG Leyou, DENG Yue, GAO Yuan, ZHANG Dan. Construction of oligotrophic compound microbial inoculants and their combined effect with functional carriers for remediation of micro-polluted source water[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 125-133. doi: 10.13205/j.hjgc.202507014

Citation:

CAO Kai, LEI Yu, PENG Yuhong, XIE Yifei, SONG Leyou, DENG Yue, GAO Yuan, ZHANG Dan. Construction of oligotrophic compound microbial inoculants and their combined effect with functional carriers for remediation of micro-polluted source water[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(7): 125-133. doi: 10.13205/j.hjgc.202507014

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Construction of oligotrophic compound microbial inoculants and their combined effect with functional carriers for remediation of micro-polluted source water

doi: 10.13205/j.hjgc.202507014

1. Chengdu Tuojiang River Investment and Development Group Co., Ltd., Chengdu 610041, China;
2. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610200, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2024-08-26
Accepted Date: 2024-10-16
Rev Recd Date: 2024-09-10

Available Online: 2025-09-11

Abstract

Abstract

The remediation and quality improvement of micro-polluted source water plays a crucial role in ensuring the safety of drinking water in rural areas. Microbial remediation offers several benefits， including low investment， eco-friendly practices， and minimal carbon emissions. However， microbial inoculants face challenges such as slow growth and susceptibility to loss in low-concentration sewage， presenting a significant obstacle to their effectiveness. As a result， there is a press need for innovative solutions to address these issues and optimize the performance of microbial remediation methods. Additionally， it is essential to develop strategies that can enhance the resilience and longevity of microbial inoculants in order to maximize their impact on water quality improvement. By addressing these challenges，the effectiveness of microbial remediation can be bolstered， ultimately improving the safety and reliability of drinking water in rural communities. Safeguarding the quality of drinking water is paramount， and leveraging microbial remediation techniques can significantly contribute to achieving this goal. To address the issue of micro-polluted source water， in this paper，the focus was on screening and developing oligotrophic indigenous microbial inoculants and creating microbial enrichment carriers to degrade low-concentration organic matter and ammonia nitrogen. Twenty strains of oligotrophic indigenous microorganisms were successfully screened from the micro-polluted source water. Subsequently， the oligotrophic compound microbial inoculant FY was constructed through combination， and its characteristics were further studied. The findings revealed that at 30℃， the removal efficiency of COD and ammonia nitrogen in micro-polluted water reached 50.96% and 79.42%， respectively. Additionally， a microbial enrichment carrier made of polycaprolactone， zeolite， ceramsite， and activated carbon was developed through hot melt blending and extrusion. This carrier demonstrated sustained nutrient release， adsorption of nitrogen and phosphorus， and a porous surface. When the dosage of the carrier and FY microbial inoculant was 0.1%， the removal efficiency of ammonia nitrogen in the micro-polluted source water reached an impressive 93% under batch water exchange. Furthermore， a biofilm was observed to form on the surface of the carrier， indicating its capacity to stably retain the FY microbial inoculant and promote the growth of functional bacteria. The study contributes technical support for the remediation of micro-polluted source water， ultimately ensuring the safety of drinking water in rural areas.
- oligotrophic compound microbial inoculants,
- microbial enrichment carrier,
- micro-polluted source water,
- drinking water safety

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References(27)

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