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Identification and Screening of Biofilm-Forming Bacteria Isolated from Mangrove Sediment for Plastic Degradation

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Afianti N. F. , Febrianti F. K. , Hatmanti A. , Endrotjahyo E. , Manik H. , Sutiknowati L. I.

Journal of Ecological Engineering

2024

tom Vol. 25, nr 8

357--366

Plastic waste is particularly harmful to human life and the environment since it is difficult to degrade. This plastic waste contributes to seawater pollution, which can disrupt the food chain and harm biodiversity in the environment, particularly the mangrove ecosystem. Mangroves act as a sediment barrier and help to decrease coastal abrasion. In the natural environment, indigenous bacteria are crucial to the bioremediation of environmental pollution, including plastic waste pollution. Bioremediation is considered environmentally friendly and can accelerate the degradation time of waste containing toxic compounds. Biofilm-forming bacteria also play an important role in the biodegradation of plastics. This research was conducted to isolate bacteria from mangrove sediment and characterize their potential as a candidate to degrade polyethylene plastic. We have found that 25 of 53 PEG-degrading bacteria could form biofilms on plastic surfaces. Seven bacterial isolates showed the ability to produce clear zones during the degradation of PEG and biofilm formation. The seven potential bacterial isolates identified using 16s rRNA gene as Bacillus sporotermodurans, Cytobacillus firmus, Rossellomorea vietnamensis, Stutzerimonas stutzeri, Dyadobacter jejuensis, Rhodococcus sp., and Achromobacter sp.

Microbial Biofilm of Plastic in Tropical Marine Environment and their Potential for Bioremediation of Plastic Waste

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Afianti N. F. , Rachman A. , Hatmanti A. , Yogaswara D. , Anggiani M. , Fitriya N. , Darmayati Y.

Journal of Ecological Engineering

2022

tom Vol. 23, nr 4

261--275

Plastic debris has become a global problem due to its widespread distribution and accumulation in the marine environment. Indigenous bacteria in the marine environment are able to quickly contaminate plastic surface and assemble to form successional plastisphere-specific bacterial. The formation of microbial biofilms on the plastic surface can indirectly initiate the degradation of plastic polymers. The environmental conditions of the tropical region make the growth of microbial biofilms become faster. However, the study on the biodiversity of microorganisms in marine plastic debris is limited to the northern hemisphere, which includes subtropical and temperate regions. This review provides current studies of biodiversity and community structure of plastisphere in tropical environments, including bacteria and microalgae, and their potential to degrade the plastic polymer. A systematic literature search has been conducted using Scopus with different combinations of keywords. In addition, Google Scholar databases were also used to find more studies on some specific topics, including plastic degrading organisms. The climate-associated areas have been grouped according to the latitude of the study site into tropical, subtropical, and temperate latitudes. The microorganisms analyzed in this review are only bacteria, actinobacteria, and microalgae.