Challenges and opportunities in bioremediation of micro-nano plastics: A review

Zhou, Yuwen; Kumar, Manish; Sarsaiya, Surendra; Sirohi, Ranjna; Awasthi, Sanjeev Kumar; Sindhu, Raveendran; Binod, Parameswaran; Pandey, Ashok; Bolan, Nanthi; Zhang, Zengqiang; Singh, Lal; Kumar, Sunil; Awasthi, Mukesh Kumar

doi:10.1016/j.scitotenv.2021.149823

Cited by 148 publications

(45 citation statements)

References 155 publications

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“…We focus our discussion on how to identify and characterize novel enzymes, especially for the important aforementioned upstream approaches, and how to assess the suitability and efficiency of enzymatic degradation processes, providing a comprehensive workflow which so far is lacking in literature. Thus, our review is substantially different from other recent reviews in the field of microbial plastic degradation ( Wang et al, 2021 ; Sarkar et al, 2022 ; Zhou et al, 2022 ). We refer to other recent reviews in the field of microbial plastic degradation reviewing other topics within this rapidly evolving field ( Wang et al, 2021 ; Sarkar et al, 2022 ; Zhou et al, 2022 ).…”

Section: Introduction—the World Of Plasticsmentioning

confidence: 85%

“…Thus, our review is substantially different from other recent reviews in the field of microbial plastic degradation ( Wang et al, 2021 ; Sarkar et al, 2022 ; Zhou et al, 2022 ). We refer to other recent reviews in the field of microbial plastic degradation reviewing other topics within this rapidly evolving field ( Wang et al, 2021 ; Sarkar et al, 2022 ; Zhou et al, 2022 ).…”

Section: Introduction—the World Of Plasticsmentioning

confidence: 85%

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Toward Microbial Recycling and Upcycling of Plastics: Prospects and Challenges

2022

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Annually, 400 Mt of plastics are produced of which roughly 40% is discarded within a year. Current plastic waste management approaches focus on applying physical, thermal, and chemical treatments of plastic polymers. However, these methods have severe limitations leading to the loss of valuable materials and resources. Another major drawback is the rapid accumulation of plastics into the environment causing one of the biggest environmental threats of the twenty-first century. Therefore, to complement current plastic management approaches novel routes toward plastic degradation and upcycling need to be developed. Enzymatic degradation and conversion of plastics present a promising approach toward sustainable recycling of plastics and plastics building blocks. However, the quest for novel enzymes that efficiently operate in cost-effective, large-scale plastics degradation poses many challenges. To date, a wide range of experimental set-ups has been reported, in many cases lacking a detailed investigation of microbial species exhibiting plastics degrading properties as well as of their corresponding plastics degrading enzymes. The apparent lack of consistent approaches compromises the necessary discovery of a wide range of novel enzymes. In this review, we discuss prospects and possibilities for efficient enzymatic degradation, recycling, and upcycling of plastics, in correlation with their wide diversity and broad utilization. Current methods for the identification and optimization of plastics degrading enzymes are compared and discussed. We present a framework for a standardized workflow, allowing transparent discovery and optimization of novel enzymes for efficient and sustainable plastics degradation in the future.

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Section: Introduction—the World Of Plasticsmentioning

confidence: 85%

Section: Introduction—the World Of Plasticsmentioning

confidence: 85%

Toward Microbial Recycling and Upcycling of Plastics: Prospects and Challenges

2022

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“…While engineering organisms for environmental deployment is a new frontier, we note that it is not without precedent, as there are many such research efforts underway (Coleman and Goold, 2019;Jaiswal and Shukla, 2020;Janssen and Stucki, 2020;Rylott and Bruce, 2020;Zhou et al, 2022), including field trials (Carvalho et al, 2015). Advances in biocontainment may provide options for restricting the spread of engineered microbes outside the intended environment (Lee et al, 2018).…”

Section: Toward Further Integration Of Biology Into Geochemical Netsmentioning

confidence: 99%

Geochemical Negative Emissions Technologies: Part I. Review

et al. 2022

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Over the previous two decades, a diverse array of geochemical negative emissions technologies (NETs) have been proposed, which use alkaline minerals for removing and permanently storing atmospheric carbon dioxide (CO2). Geochemical NETs include CO2 mineralization (methods which react alkaline minerals with CO2, producing solid carbonate minerals), enhanced weathering (dispersing alkaline minerals in the environment for CO2 drawdown) and ocean alkalinity enhancement (manipulation of ocean chemistry to remove CO2 from air as dissolved inorganic carbon). CO2 mineralization approaches include in situ (CO2 reacts with alkaline minerals in the Earth's subsurface), surficial (high surface area alkaline minerals found at the Earth's surface are reacted with air or CO2-bearing fluids), and ex situ (high surface area alkaline minerals are transported to sites of concentrated CO2 production). Geochemical NETS may also include an approach to direct air capture (DAC) that harnesses surficial mineralization reactions to remove CO2 from air, and produce concentrated CO2. Overall, these technologies are at an early stage of development with just a few subjected to field trials. In Part I of this work we have reviewed the current state of geochemical NETs, highlighting key features (mineral resources; processes; kinetics; storage durability; synergies with other NETs such as DAC, risks; limitations; co-benefits, environmental impacts and life-cycle assessment). The role of organisms and biological mechanisms in enhancing geochemical NETs is also explored. In Part II, a roadmap is presented to help catalyze the research, development, and deployment of geochemical NETs at the gigaton scale over the coming decades.

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“…Chemically, intact plastic polymers are considered inert and harmless; however, upon degradation, hazardous additives, often added to the plastics during manufacture to afford desired properties, may be released (Bridson et al, 2021). Except for leaching (Rillig et al, 2021;Zhou et al, 2021), MP can also serve as a vector for concentrating and transporting pollutants adsorbed to the particles' surfaces (Tourinho et al, 2019). Thus, many publications on the toxic effects of MP exposure highlight the hazardous nature of MP to soil biota (Kim and An, 2019;Kim et al, 2020;Rillig and Lehmann, 2020), threatening biodiversity (He et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Lolium multiflorum germination and growth affected by virgin, naturally, and artificially aged high-density polyethylene microplastic and leachates

Esterhuizen-Londt

Vikfors

Penttinen

et al. 2022

Front. Environ. Sci.

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With the detection of microplastics in soil, coupled with the various sources continuously contributing to its delivery to and distribution in soils, understanding the effects of microplastics on plants are necessary. Plastics discarded in the environment continually degrade into micro- and nano-sizes, subsequently leaching hazardous chemicals with time. Not only time but also environmental factors related to the climate of the area where the plastic is degrading will contribute to the breakdown process. Thus, this study aimed to understand the phytotoxic effects of microplastic derived from a frequently discarded plastic item, i.e., high-density polyethylene soda bottle caps. The commonly occurring perennial Lolium multiflorum (Italian ryegrass) was exposed to microplastic derived from new and artificially aged bottle caps as well as bottle caps collected from the cities of Lahti, Finland and Gqeberha, South Africa. Additionally, leachates were prepared from these samples and used for exposure. Germination, root and shoot growth, and fresh weight were measured as indicators of adverse effects, and various growth parameters were calculated. Microplastic and leachates from new and Lahti collected bottle caps adversely affected the germination and growth of the plant, indicating that aging and environmental factors affect the phytotoxicity of plastics as environmental pollutants in soil.

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Challenges and opportunities in bioremediation of micro-nano plastics: A review

Cited by 148 publications

References 155 publications

Toward Microbial Recycling and Upcycling of Plastics: Prospects and Challenges

Toward Microbial Recycling and Upcycling of Plastics: Prospects and Challenges

Geochemical Negative Emissions Technologies: Part I. Review

Lolium multiflorum germination and growth affected by virgin, naturally, and artificially aged high-density polyethylene microplastic and leachates

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