scholarly journals Concepts of bioremediation, bio augmentation and biosensors

2021 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Organic Contaminants ◽  
Bacterial Culture ◽  
Environmental Contaminants ◽  
Waste Materials ◽  
Biological Structure ◽  
Factors Affecting ◽  
Growth And Reproduction

Bioremediation uses microorganisms to destroy or immobilize waste materials. Microorganisms include archaea, bacteria, fungi and actinomycetes. Microorganisms destroy organic contaminants when they are using chemicals for their growth and reproduction. Although it is an old technique, it is still frequently used to remove environmental contaminants which have increased rapidly due to increased population, industrialization, and urbanization. There are various types of bioremediation, and different mechanisms associated with them. The process of bioremediation is enhanced by biostimulation. When bacterial culture is added to the contaminants to increase the rate of biodegradation, it is known as bio augmentation. Biosensors are devices used to detect the presence or concentration of a biological analyse, such as a biomolecule, a biological structure or a microorganism. This paper gives an idea of bioremediation, its scope, factors affecting bioremediation, types, biostimulation, bioaugmentation and biosensors.

Factors affecting bacterial culture positivity in specimens from bronchoscopy in patients with suspected lung cancer

2018 ◽  
Vol 56 (6) ◽  
pp. 457-463 ◽  
Author(s):  
Yoshihisa Hiraishi ◽  
Takehiro Izumo ◽  
Shinji Sasada ◽  
Yuji Matsumoto ◽  
Toshiyuki Nakai ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Bacterial Culture ◽  
Factors Affecting ◽  
Culture Positivity

Preparation and Application of Biochars for Organic and Microbial Control in Wastewater Treatment Regimes

2019 ◽  
pp. 19-34 ◽  
Author(s):  
Victor Odhiambo Shikuku ◽  
Wilfrida N. Nyairo ◽  
Chrispin O. Kowenje
Keyword(s):  
Organic Pollutants ◽  
Organic Contaminants ◽  
Activated Carbons ◽  
Low Cost ◽  
Microbial Control ◽  
Chemical Compositions ◽  
Preparation Methods ◽  
Factors Affecting ◽  
Surface Areas ◽  
Control Factors

Biochars have been extensively applied in soil remediation, carbon sequestration, and in climate change mitigation. However, in recent years, there has been a significant increase in biochar research in water treatment due to their stupendous adsorptive properties for various contaminants. This is attributed to their large surface areas, pore structures, chemical compositions, and low capital costs involved making them suitable candidates for replacing activated carbons. This chapter discusses the preparation methods and properties of biochars and their removal efficacy for organic contaminants and microbial control. Factors affecting adsorption and the mechanisms of adsorption of organic pollutants on biochars are also concisely discussed. Biochars present environmentally benign and low-cost adsorbents for removal of both organic pollutants and microbial control for wastewater purification systems.

scholarly journals Partition of pentachlorophenol (PCP) into particulate and dissolved phases in the waters of the Vistula River mouth at the Gulf of Gdańsk

2016 ◽  
Vol 45 (2) ◽  
Author(s):  
Marta E. Kobusińska ◽  
Maria Witt ◽  
Krzysztof Lewandowski ◽  
Elżbieta Niemirycz
Keyword(s):  
Organic Contaminants ◽  
Temporal Trends ◽  
River Mouth ◽  
Gulf Of Gdańsk ◽  
Factors Affecting ◽  
Hydrological Characteristics ◽  
Vistula River ◽  
Gulf Of Gdansk ◽  
Relative Solubility ◽  
Spm Concentration

AbstractThe Vistula River plays an important role in the supply of autochthonous and allochthonous material to the Gulf of Gdansk. The suspended particulate matter (SPM) of fluvial origin is considered to constitute a specific sorbent for halogenated organic compounds due to their lipophilic characteristics and relative solubility. Because there are many factors affecting the input of SPM into the estuarine environment of the Gulf of Gdansk, e.g. hydrological characteristics of the Vistula River, it became necessary to verify whether the same processes may affect a discharge of organic contaminants. The study presents an approach to the assessment of temporal trends in SPM concentration in the Vistula River discharged into the Gulf of Gdansk as well as the analysis of pentachlorophenol (PCP), a commonly used agricultural biocide, a precursor of dioxins in either dissolved or particulate phases in the river (the Vistula River) and sea waters (the Gulf of Gdansk). The study revealed that the hydrological characteristics appear to influence a load of SPM. However, the discharge of PCP is additionally related to the environmental conditions, physicochemical properties of the compound and the sorbent, affecting the partitioning of PCP into dissolved and particulate phases.

Factors affecting growth and reproduction of Noogoora burr (Xanthium occidentale Bertol.)

1984 ◽  
Vol 35 (2) ◽  
pp. 271 ◽  
Author(s):  
RJ Martin ◽  
JA Carnahan
Keyword(s):  
Plant Density ◽  
Unit Area ◽  
Dry Weight ◽  
Low Light ◽  
Factors Affecting ◽  
Shoot Dry Weight ◽  
High Plant Density ◽  
Low Levels ◽  
Net Assimilation ◽  
Growth And Reproduction

Plant density and availability of light and water significantly affected growth and reproduction of Noogoora burr plants grown in a glasshouse. Burr yield was reduced most by low levels of available water. Low light intensity, low water availability and high plant density reduced net assimilation rates and, in combination, caused the greatest reduction in burr production. Under field conditions the ratio of burr dry weight to total shoot dry weight decreased with increasing plant density. In terms of production per unit area, dry weight of main stems and main stem leaves increased with increasing plant density at the expense of burr dry weight. We conclude that the success of Noogoora burr as a fleece contaminant could be attributed, in part, to: the insensitivity of burr production to variation in soil fertility and length of growing season; the ability to regulate plant density under conditions of limiting light or water; and the ability to regulate plant components so that the efficiency of burr production increases with a decrease in plant density.

Factors affecting the release of hydrophobic organic contaminants from natural sediments

2000 ◽  
Vol 19 (10) ◽  
pp. 2401-2408 ◽  
Author(s):  
Wei Chen ◽  
Amy T. Kan ◽  
Gongmin Fu ◽  
Mason B. Tomson
Keyword(s):  
Organic Contaminants ◽  
Hydrophobic Organic Contaminants ◽  
Factors Affecting

Life history characteristics of the potentially invasive Ponto-Caspian goby Neogobius fluviatilis in natural lakes from its native range (Black Sea region of Turkey)

2018 ◽  
Vol 69 (10) ◽  
pp. 1544 ◽  
Author(s):  
Uǧur Karakuş ◽  
Nildeniz Top ◽  
Erdi Gökhan Tepeköy ◽  
John Robert Britton ◽  
Ali Serhan Tarkan
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Somatic Growth ◽  
Reproductive Traits ◽  
Native Range ◽  
Black Sea Region ◽  
Factors Affecting ◽  
Natural Lakes ◽  
Key Factor ◽  
Growth And Reproduction

The aim of this study was to provide baseline data and fill an outstanding knowledge gap in our understanding of factors affecting the invasiveness of the Ponto-Caspian gobiid Neogobius fluviatilis. To this end, the life history traits (as somatic growth and reproduction) of N. fluviatilis were studied in three natural freshwater lakes in its native range. These populations were characterised by slow somatic growth rates, being the slowest reported across all the native and non-native ranges of N. fluviatilis. Ages were recorded to 7 years. Across the three lakes, there was considerable variability in sex ratios and reproductive traits (including length at maturity and fecundity at length and age), revealing considerable interpopulation variability. These data suggest that N. fluviatilis has considerable plasticity in the expression of its life history traits, with this plasticity argued as a key factor in facilitating the ability of N. fluviatilis to establish and invade new waters following introductions.

scholarly journals Study On Critical Temperatures For Naphthalene And Chlorobenzene Removal During In Situ Steam Injection Remediation

2021 ◽  
Author(s):  
Ru xue Liu ◽  
Xinru Yang ◽  
Yongsheng Zhao
Keyword(s):  
Critical Temperature ◽  
Organic Pollutants ◽  
Organic Contaminants ◽  
Fine Sand ◽  
Steam Injection ◽  
Coarse Sand ◽  
Critical Temperatures ◽  
Factors Affecting ◽  
Remediation Process

Abstract Steam injection is an effective technique for the in situ remediation of volatile and semi-volatile organic contaminants. In this study, the influence of temperature and media on the removal of organic pollutants, such as naphthalene and chlorobenzene, was investigated in the remediation process through batch and remediation experiments, and the solid, liquid, and gaseous phase migration and transformation of organic pollutants during remediation were evaluated. The results demonstrated that the temperature significantly influenced the removal of organic pollutants. It was found that the critical temperatures for naphthalene and chlorobenzene were 50°C and 30°C, respectively. When the temperature was higher than the critical temperature, the final removal rates of naphthalene and chlorobenzene reached over 94% and 96%, respectively. The remediation area of chlorobenzene determined according to the critical temperature has a good result; the error compared with the actual remediation area in both coarse sand and fine sand was approximately 8.7%. In the simulation tank, the temperature changes can be divided into three stages: the ambient temperature stage, the temperature rapid rise stage, and the stable stage. Moreover, we found that the remediation effect of aquifers is not only related to temperature, but also to the location of the SVE well (soil vapour extraction). These findings reveal the main factors affecting the application of hot steam technology and the relationship between the temperature field and contamination field in the remediation process.

Sign in / Sign up

Export Citation Format

Share Document