Microbial approaches for remediation of pollutants: Innovations, future outlook, and challenges

2020 ◽  
pp. 0958305X1989678 ◽  
Author(s):  
Bishwambhar Mishra ◽  
Sunita Varjani ◽  
Gopalakrishnan Kumar ◽  
Mukesh Kumar Awasthi ◽  
Sanjeev Kumar Awasthi ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Scientific Knowledge ◽  
Scientific Literature ◽  
Microbial Interactions ◽  
Future Outlook ◽  
The Past ◽  
Treatment Technologies ◽  
Polluted Sites ◽  
Environmentally Sound

Environmental contamination with persistent organic pollutants has emerged as a serious threat of pollution. Bioremediation is a key to eliminate these harmful pollutants from the environment and has gained the interest of researchers during the past few decades. Scientific knowledge upon microbial interactions with individual pollutants over the past decades has helped to abate environmental pollution. Traditional bioremediation approaches have limitations for their applications; hence, it is essential to discover new bioremediation approaches with biotechnological interventions for best results. The developments in various methodologies are expected to increase the efficiency of bioremediation techniques and provide environmentally sound strategies. This paper deals with the profiling of microorganisms present in polluted sites using various techniques such as culture-based approaches and omics-based approaches. Besides this, it also provides up-to-date scientific literature on the microbial electrochemical technologies which are nowadays considered as the best approach for remediation of pollutants. Detailed information about future outlook and challenges to evaluate the effect of various treatment technologies for remediation of pollutants has been discussed.

Type, Sources, Methods and Treatment of Organic Pollutants in Wastewater

2021 ◽  
Author(s):  
Poslet Shumbula ◽  
Collet Maswanganyi ◽  
Ndivhuwo Shumbula
Keyword(s):  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Environmental Concern ◽  
Low Cost ◽  
Electrochemical Techniques ◽  
Activated Carbon Adsorption ◽  
Carbon Adsorption ◽  
Synthetic Organic Chemical ◽  
Treatment Technologies ◽  
Living Organisms

Persistent organic pollutants (POPs), which are synthetic organic chemical compounds, either intentionally or unintentionally produced, have widely aroused public concern in recent years. These chemicals are toxic and major environmental concern due to their persistence, long range transportability, bioaccumulation and potentially adverse effects on living organisms. Uncontrolled inputs combined with poor environmental management often result in elevated levels of persistent organic pollutants in affected estuaries. Since the Stockholm Convention on POPs was adopted, different techniques have been extensively developed. A major focus revealed the need for low cost methods that can be implemented easily in developing countries such as electrochemical techniques. Persistent organic pollutants are known to be resistant to conventional treatment methods such as flocculation, coagulation, filtration and oxidant chemical treatment. However, various advanced wastewater treatment technologies such as, activated carbon adsorption, biodegradation using membrane bioreactor and advanced oxidation processes (AOPs) have been applied in the treatment of POPs.

Fate of POPs and its Laboratorial Technics under Combined Plants Cultivation

2014 ◽  
Vol 1065-1069 ◽  
pp. 3146-3150
Author(s):  
Zhi Hua Lei
Keyword(s):  
Medicago Sativa ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Brassica Campestris ◽  
Single Species ◽  
Microbial Interactions ◽  
Mixed Cropping

The removal of persistent organic pollutants (POPs) in soils at initial concentrations ranging from 20.00 to 321.05 mg·kg-1 was investigated under different planting patterns, and enhancement mechanisms were analyzed. Results showed that the dissipation of POPs in soils growing Brassica campestris and Medicago sativa significantly exceeded those vegetating single species. During 70-day experiment, about 75.06% of Pyr and 68.22% of BaP was removed from the soils under mixed cropping; while only 31.8% and 64.03% of Pyr and 27.84% and 51.93 of BaP were removed under single rape and alfalfa cropping, respectively. Of all pathways enforcing POPs removal, plant-microbial interactions is the most predominant. These results suggested a feasibility of the establishment of multi-species phytoremediation for improvement of the remediation efficiencies of POPs, which may decrease accumulations of POPs in crops and thus reduce their risks.

Enhanced Dissipation of POPs in Soils by Combined Plants Cultivation

2014 ◽  
Vol 675-677 ◽  
pp. 416-421
Author(s):  
Jing Hong Luo ◽  
Zhi Hua Lei
Keyword(s):  
Medicago Sativa ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Brassica Campestris ◽  
Single Species ◽  
Microbial Interactions ◽  
Mixed Cropping

The removal of persistent organic pollutants (POPs) in soils at initial concentrations ranging from 20.00 to 321.05 mg·kg-1 was investigated under different planting patterns, and enhancement mechanisms were analyzed. Results showed that the dissipation of POPs in soils growing Brassica campestris and Medicago sativa significantly exceeded those vegetating single species. During 70-day experiment, about 75.06% of Pyr and 68.22% of BaP was removed from the soils under mixed cropping; while only 31.8% and 64.03% of Pyr and 27.84% and 51.93 of BaP were removed under single rape and alfalfa cropping, respectively. Of all pathways enforcing POPs removal, plant-microbial interactions is the most predominant. These results suggested a feasibility of the establishment of multi-species phytoremediation for improvement of the remediation efficiencies of POPs, which may decrease accumulations of POPs in crops and thus reduce their risks.

scholarly journals The Pollution Spectrum of Old Pesticides Storages in Moldova

2012 ◽  
Vol 7 (1) ◽  
pp. 124-128
Author(s):  
Gh. Duca ◽  
O. Bogdevich ◽  
O. Cadocinicov ◽  
D. Porubin
Keyword(s):  
World Bank ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Environmental Problems ◽  
Hazardous Wastes ◽  
Industrial Chemicals ◽  
Polluted Sites

The inventory of old pesticide storages in Moldova executed by Ministry of Environment and World Bank showed a large quantity of polluted sites (near 1500) remains after the repacking and evacuation project. This work was made first of all for Persistent Organic Pollutants (POPs). More that 15 % sites were determined as extra high polluted territory with the POPs concentration in soil more 50,0 mg/kg. They include some of the world's most harmful chemicals including highly toxic pesticides such as HCH, DDT; industrial chemicals such as PCBs. The management of domestic and hazardous wastes is considered as one of the most urgent environmental problems in Moldova.

scholarly journals Interactions of Microplastics with Persistent Organic Pollutants and the Ecotoxicological Effects: A Review

2021 ◽  
Vol 1 (1) ◽  
pp. 24-34
Author(s):  
Kuok Ho Daniel Tang
Keyword(s):  
Environmental Factors ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Environmental Pollutants ◽  
High Accumulation ◽  
The Past ◽  
Holistic Understanding ◽  
Two Factors ◽  
Natural Organic Matters ◽  
Multiple Conditions

With the increasing presence of microplastics and persistent organic pollutants (POPs), it is crucial to understand the interactions between the two emerging environmental pollutants and their ecotoxicological risks. This paper reviews more than 50 relevant scholarly papers published mainly in the past 10 years. It shows that the sorption of POPs to microplastics is affected by environmental factors and the properties of microplastics. The environmental factors comprise salinity, pH, natural organic matters and temperature. The properties of microplastics include degree of aging, molecular weight, size, shape, density, crystallinity, polymer type and color. The two factors are interconnected through weathering and weatherability of microplastics, where properties of microplastics, hence their interactions with POPs would be modified by environmental factors. Microplastics are potential vectors of POPs due to their ability to sorb and concentrate POPs. However, the studies reviewed showed the impacts to be low or insignificant and the sorbed POPs do not demonstrate significantly high accumulation, bioavailability and toxicity. In some literature, it has been reported that microplastics might reduce POPs in an organism. Due to limited studies and opposing views, there is a need to conduct more studies involving diverse POPs and microplastics under multiple conditions to provide a more holistic understanding on this subject.

Blast from the Past: Melting Glaciers as a Relevant Source for Persistent Organic Pollutants

2009 ◽  
Vol 43 (21) ◽  
pp. 8173-8177 ◽  
Author(s):  
Christian Bogdal ◽  
Peter Schmid ◽  
Markus Zennegg ◽  
Flavio S. Anselmetti ◽  
Martin Scheringer ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
The Past

A 200-Year History of the Study of Childhood Language Disorders of Unknown Origin: Changes in Terminology

2020 ◽  
Vol 5 (1) ◽  
pp. 6-11 ◽  
Author(s):  
Laurence B. Leonard
Keyword(s):  
Language Impairment ◽  
Specific Language Impairment ◽  
Scientific Literature ◽  
Language Disorder ◽  
Language Disorders ◽  
Unknown Origin ◽  
Developmental Language Disorder ◽  
The Past ◽  
History Of ◽  
The Many

Purpose The current “specific language impairment” and “developmental language disorder” discussion might lead to important changes in how we refer to children with language disorders of unknown origin. The field has seen other changes in terminology. This article reviews many of these changes. Method A literature review of previous clinical labels was conducted, and possible reasons for the changes in labels were identified. Results References to children with significant yet unexplained deficits in language ability have been part of the scientific literature since, at least, the early 1800s. Terms have changed from those with a neurological emphasis to those that do not imply a cause for the language disorder. Diagnostic criteria have become more explicit but have become, at certain points, too narrow to represent the wider range of children with language disorders of unknown origin. Conclusions The field was not well served by the many changes in terminology that have transpired in the past. A new label at this point must be accompanied by strong efforts to recruit its adoption by clinical speech-language pathologists and the general public.

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