A Perspective on the Selection of Froth Treatment Processes

2008 ◽  
Vol 82 (4) ◽  
pp. 704-709 ◽  
Author(s):  
William E. Shelfantook
Keyword(s):  
Treatment Processes ◽  
Selection Of

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.

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

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.

A critical evaluation of combined engineered and aquifer treatment systems in water recycling

2008 ◽  
Vol 57 (5) ◽  
pp. 753-762 ◽  
Author(s):  
P. Dillon ◽  
D. Page ◽  
J. Vanderzalm ◽  
P. Pavelic ◽  
S. Toze ◽  
...  
Keyword(s):  
Treatment Effectiveness ◽  
Critical Evaluation ◽  
Aquifer Recharge ◽  
Advantages And Disadvantages ◽  
Treatment Processes ◽  
Aquifer Characteristics ◽  
Australian Experience ◽  
Reclaim Water ◽  
The City ◽  
Selection Of

Australian experience at five research sites where stormwater and reclaimed water have been stored in aquifers prior to reuse, have yielded valuable information about water treatment processes in anaerobic and aerobic aquifers. One of these sites is the stormwater to potable water ASTR project at the City of Salisbury, a demonstration project within the broader EC project ‘RECLAIM WATER’. A framework for characterising the effectiveness of such treatment for selected organic chemicals, natural organic matter, and pathogens is being developed for inclusion in new Australian Guidelines for Management of Aquifer Recharge. The combination of pre-treatments (including passive systems such as reed beds) and aquifer treatment effectiveness in relation to source waters and intended uses of recovered water will be described. Advantages and disadvantages of various types of pre-treatments in relation to effectiveness and sustainability of managed aquifer recharge will be discussed taking account of aquifer characteristics. These observations will be consolidated into a draft set of principles to assist in selection of engineered treatments compatible with passive treatment in aquifers.

The Research on Tibetan Text Classification Based on N-Gram Model

2014 ◽  
Vol 543-547 ◽  
pp. 1896-1900
Author(s):  
Deng Zhou ◽  
Wen Huang He ◽  
Tao Tao Wu
Keyword(s):  
Feature Selection ◽  
Text Classification ◽  
Word Segmentation ◽  
Classification Model ◽  
Treatment Processes ◽  
Pre Treatment ◽  
N Gram ◽  
Selection Of

This Compared with the traditional text classification model, the Tibetan text classification based on N-Gram model has adopted N-Gram model in terms of the level of word. In other words, during the text classification, word segmentation is not required. Also, feature selection and abundant pre-treatment processes are avoided. This paper not only carried out profound research on N-Gram models, but also discusses the selection of parameter N in the model by adopting Naïve Bayes Multinomial classifier.

Sign in / Sign up

Export Citation Format

Share Document