Development and application of bacterial cultures for the removal of chlorinated aliphatics

1995 ◽  
Vol 31 (1) ◽  
pp. 237-247 ◽  
Author(s):  
Dick B. Janssen ◽  
Wim de Koning
Keyword(s):  
Waste Streams ◽  
Synthetic Compound ◽  
Catabolic Enzymes ◽  
Treatment Processes ◽  
Cometabolic Degradation ◽  
Chlorinated Aliphatics ◽  
Biological Remediation ◽  
Related Compounds ◽  
Remediation Process ◽  
Selection Of

The possibility of obtaining microbial cultures for the degradation of halogenated aliphatic hydrocarbons is mainly determined by the diversity and activity of catabolic enzymes that exist in nature. If a suitable organism is available, applications for the treatment of different waste streams can be developed. The relation between the kinetic parameters of the key enzymes and the properties of the organisms relevant for such applications is discussed, both for growth supporting and cometabolic degradation. When growth on a chlorinated aliphatic compound is possible, development of a biological remediation process is likely to be relatively easy. This is illustrated with the degradation of 1,2-dichloroethane, a synthetic compound that can be mineralized by specific cultures. Closely related compounds may be recalcitrant, which can be understood from an examination of the degradative pathways. The development of biological treatment processes based on cometabolic degradation is more demanding because selection of the proper organisms and maintaining them in the process are not straightforward. The range of compounds that can be degraded cometabolically is significantly larger. The potential of obtaining improved degradation by genetic adaptation and the use of biofilms is discussed.

A synthesis of alkylated 3-aminoisoquinolines and related compounds

1982 ◽  
Vol 35 (7) ◽  
pp. 1391 ◽  
Author(s):  
AJ Liepa
Keyword(s):  
Phosphoryl Chloride ◽  
Tertiary Amides ◽  
Derivatives Of ◽  
Related Compounds ◽  
Selection Of

N,N-Dialkyl derivatives of 3-aminoisoquinoline have been prepared by reaction of nitriles with various arylacetic acid tertiary amides in the presence of phosphoryl chloride. The synthesis has been extended to include a benzoisoquinoline and annulated isoquinolines by the selection of appropriate amide and nitrile precursors.

scholarly journals Produced Water: An overview of treatment technologies

2020 ◽  
Vol 8 (4) ◽  
pp. 207-224 ◽  
Author(s):  
Andressa Simões ◽  
Roberto Macêdo-Júnior ◽  
Brenda Santos ◽  
Lucas Silva ◽  
Daniel Silva ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Produced Water ◽  
Oil And Gas Industry ◽  
Waste Streams ◽  
Bibliometric Method ◽  
Gas Industry ◽  
Treatment Processes ◽  
Complex Chemical Composition ◽  
Treatment Technologies ◽  
Number Of Publications

Produced water is one of the single most significant waste streams in the oil and gas industry, and because it is a residue of complex chemical composition, it can't be simply discarded in the environment, it should receive appropriate treatments before. This paper presents a mapping of the quantitative evolution, referring to the leading publications on the study of water produced with a focus on treatments. A bibliometric method was then adopted to build a structured database with the selected articles and then analyzed the number of publications, countries, areas of impact, authors, keywords, periodicals, and affiliations. The thematic has proved to be an essential line of research over the years. The analysis was considered in the period between 1969 and 2017. Several indicators were observed regarding the development of academic and technological research on water produced as well as its treatment processes. The study was performed in the Scopus database search engine to gather data, and 2434 documents were identified, with 851 articles investigated more specifically. This paper highlights the need for constant future studies about the produced water to minimize not only pollution but also reduce operating costs.

scholarly journals Sustainable Remediation of Contaminated Soil Using Biosurfactants

2021 ◽  
Vol 9 ◽  
Author(s):  
Catherine N. Mulligan
Keyword(s):  
Time Constraints ◽  
Future Research ◽  
Research Needs ◽  
Regulatory Requirements ◽  
Recovery Processes ◽  
Sustainable Remediation ◽  
Low Toxicity ◽  
Remediation Process ◽  
Selection Of

Selection of the most appropriate remediation technology must coincide with the environmental characteristics of the site. The risk to human health and the environment at the site must be reduced, and not be transferred to another site. Biosurfactants have the potential as remediation agents due to their biodegradability, low toxicity, and effectiveness. Selection of biosurfactants should be based on pollutant characteristics and properties, treatment capacity, costs, regulatory requirements, and time constraints. Moreover, understanding of the mechanisms of interaction between biosurfactants and contaminants can assist in selection of the appropriate biosurfactants for sustainable remediation. Enhanced sustainability of the remediation process by biosurfactants can be achieved through the use of renewable or waste substrates, in situ production of biosurfactants, and greener production and recovery processes for biosurfactants. Future research needs are identified.

Selection of natural treatment processes for algae removal from stabilisation ponds effluents in Brasilia, using multicriterion methods

2002 ◽  
Vol 46 (4-5) ◽  
pp. 347-354 ◽  
Author(s):  
K.D. Neder ◽  
G.A. Carneiro ◽  
T.R. Queiroz ◽  
M.A.A. de Souza
Keyword(s):  
Overland Flow ◽  
Evaluation Criteria ◽  
Treatment Plant ◽  
Pilot Scale ◽  
High Rate ◽  
Preliminary Treatment ◽  
Algae Removal ◽  
Treatment Processes ◽  
Natural Treatment ◽  
Selection Of

A multicriterion methodology is used in the evaluation and selection of the most appropriate alternative(s) for removing algae from stabilisation ponds effluents in a case study in Brasilia. For this purpose, five different natural treatment processes are tested at pilot scale: rock filter, sand filter, floating aquatic plants, constructed wetlands, and overland flow. These pilot units were constructed in Brasilia and set in parallel, each one receiving a portion of the effluent that comes from an existing wastewater treatment plant composed of preliminary treatment, UASB reactors, and high-rate stabilisation ponds. Several evaluation criteria are used in order to relate the capabilities of the post-treatment processes to the multiple objectives in this case. Two multicriterion decision-aid methods - compromise programming and ELECTRE-III - are used to select the most satisfying processes. The top ranking alternatives are indicated for subsequent studies, considering the possible implementation of these technologies to existing plants.

Selection of the optimum parameter for the control of heat-treatment processes of alloys

1988 ◽  
Vol 30 (3) ◽  
pp. 185-190
Author(s):  
M. G. Tartakovskii ◽  
V. A. Golichenko ◽  
I. V. Ryabikova
Keyword(s):  
Heat Treatment ◽  
Optimum Parameter ◽  
Treatment Processes ◽  
Selection Of

scholarly journals An emerging platform from renewable resources: selection guidelines for human exposure of furfural-related compounds

2014 ◽  
Vol 3 (5) ◽  
pp. 311-314 ◽  
Author(s):  
R. F. M. Frade ◽  
J. A. S. Coelho ◽  
S. P. Simeonov ◽  
C. A. M. Afonso
Keyword(s):  
Renewable Resources ◽  
Human Exposure ◽  
Building Blocks ◽  
Related Compounds ◽  
Selection Of

Toxicity of hydroxymethylfurfural and 21 derivatives was assessed. Important guidelines for selection of more human friendly building blocks were obtained.

Choosing the most appropriate technique for wastewater disinfection – parallel investigation of four disinfection systems with different preceding treatment processes

2012 ◽  
Vol 7 (3) ◽  
Author(s):  
A. Bischoff ◽  
P. Cornel ◽  
M. Wagner
Keyword(s):  
Water Reuse ◽  
Appropriate Technology ◽  
Indicator Organisms ◽  
Potential Health ◽  
Treatment Processes ◽  
Chlorine Gas ◽  
Wastewater Disinfection ◽  
Microbiological Stability ◽  
Parasitic Pathogens ◽  
Selection Of

A variety of bacterial, viral and parasitic pathogens are transmitted via water. Adequate disinfection of wastewater is therefore vital to address the potential health risks of water reuse. A range of well-established methods is available for wastewater disinfection. The selection of the most appropriate technology plays a key role in enhancing the safety, acceptability and reliability of water reuse systems. The objective of this study was the parallel examination of well-established and emerging wastewater disinfection methods, with particular attention being paid to the preceding wastewater treatment processes. The disinfectants investigated were: ultraviolet (UV) radiation, ozone (O3), chlorine dioxide (ClO2) and electrolytically-produced chlorine gas (Cl2). In order to support the specific selection of the most appropriate disinfection method, multiple criteria were determined: concentrations of indicator organisms, effluent toxicity, microbiological stability of the effluent, costs, energy consumption, and supplementary effects. The results show that stringent hygienic treatment objectives can be met with each of the applied methods immediately after disinfection, while the results of the evaluation of the further criteria differ widely between the analysed disinfectants.

Design and Selection of Safe Water Supply Solutions for Emerging Regions: A Demography Based Demand Driven Approach

2012 ◽  
Author(s):  
Shaiful Arif ◽  
Zahed Siddique
Keyword(s):  
Drinking Water ◽  
Global Climate ◽  
Low Cost ◽  
Source Model ◽  
Efficient Design ◽  
Rural Village ◽  
Treatment Processes ◽  
Design Alternatives ◽  
Selection Of

Due to global climate change, increase in pollution along with reduced quantity of drinking water compared to the total volume of water, the scarcity of potable water is declining gradually. Researchers have become increasingly interested in efficient design of treatment processes, but, there is a lack of research to investigate appropriate, applicable, low cost and simple water treatment processes for underprivileged communities. Providing safe drinking water in these communities is more challenging due to limitation of resources and infrastructure. In this paper we developed a mathematical foundation of Demography Based Demand Driven (DBDD) approach to capture and identify design alternatives (combination of different treatment processes). The developed approach assists to identify, extract, categorize, and compare water related attributes associated with a community and mapped onto source model to identify and select a set of feasible treatment processes. A case study for a community of a rural village in emerging regions of Honduras is modeled and the approach presented in this paper is implemented to design and select feasible service solutions.

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