Physico-chemical treatments for the complete removal of non-ionic surfactants from effluents

1987 ◽  
Vol 45 (4) ◽  
pp. 245-260 ◽  
Author(s):  
Howard Weinberg ◽  
Nava Narkis
Keyword(s):  
Complete Removal ◽  
Ionic Surfactants ◽  
Chemical Treatments ◽  
Physico Chemical

Biodegradation of RDX-contaminated wastes in a nitrogen-deficient environment

1998 ◽  
Vol 38 (4-5) ◽  
pp. 219-224 ◽  
Author(s):  
Z. Ronen ◽  
A. Brenner ◽  
A. Abeliovich
Keyword(s):  
Carbon Source ◽  
Carbon Sources ◽  
Cost Effective ◽  
Complete Removal ◽  
Chemical Treatments ◽  
Carbon Adsorption ◽  
Physico Chemical ◽  
Cost Effective Alternative ◽  
Available Carbon ◽  
Waste Mixture

A feasible biological treatment process for RDX-contaminated wastes was demonstrated in a bench-scale system, using real wastewater of a munitions factory. The wastewater mixture tested included the nitramine RDX together with high levels of nitrate and various organic solvents such as cyclohexanone and acetone. The purpose of the study was to remove both RDX and nitrate in order to prevent groundwater contamination. A two-stage reactor system including an anoxic stage followed by an aerobic one was tested. The anoxic stage was aimed at removing nitrate by denitrification, using available carbon sources present in the waste mixture. Additional supply of carbon source (acetone) was required to support complete removal of nitrate. Further removal of residual organic was achieved in the aerobic stage together with total mineralization of RDX. Complete removal of nitrate in the anoxic stage was found to be crucial to RDX mineralization in the aerobic stage, since RDX was used solely as a nitrogen source. Additional carbon source (cyclohexanone) was also required in the aerobic stage to assure complete removal of RDX. The treatment scheme tested may be a cost-effective alternative to physico-chemical treatments such as carbon adsorption and UV destruction, commonly applied for explosives-contaminated wastes.

New Process for Physico-Chemical Pretreatment of Dairy Effluents with Agricultural Use of Sludge Produced

1990 ◽  
Vol 22 (9) ◽  
pp. 93-100 ◽  
Author(s):  
Á Kárpáti ◽  
L. Bencze ◽  
J. Borszéki
Keyword(s):  
Field Experiments ◽  
Complete Removal ◽  
Grain Production ◽  
Molecular Weights ◽  
Physico Chemical ◽  
New Process ◽  
Agricultural Use ◽  
Removal Of Fat ◽  
Biological Methods ◽  
Dairy Effluents

A combined physico-chemical process is suitable for the effective pretreatment of dairy effluents, achieving almost complete removal of fat, and considerable reduction of protein content. The specific cost of COD removal using the process is only half or a third of that using aerobic biological methods. Depending on the chemicals used, further treatment or, in certain cases, agricultural utilization, of the sludge is possible. In addition, the components remaining in the effluent have low molecular weights, are easily degradable, and are very favourable as nutrients in municipal aerobic post-treatment. Investigation of the sludge showed that it did not contain any pathogen organisms and therefore its application on land is recommended. Laboratory and field experiments have shown that, with agricultural use of the sludge, increased plant growth and grain production were achieved.

scholarly journals EFFECT OF SOLAR DEHYDRATION METHOD ON PHYSICO-CHEMICAL AND SENSORY CHARACTERISTICS OF GREEN BEANS (PHASEOLUS VULGARIS)

2017 ◽  
Vol 5 (4RAST) ◽  
pp. 39-44
Author(s):  
Kuna Priyanka ◽  
R.C. Chandni ◽  
Amar Sankar ◽  
A.V. Raghu
Keyword(s):  
Sodium Chloride ◽  
Sodium Bicarbonate ◽  
Magnesium Chloride ◽  
Chemical Characteristics ◽  
Green Beans ◽  
Chemical Treatments ◽  
Physico Chemical ◽  
Nutritional Characteristics ◽  
Microbial Analysis ◽  
Chlorophyll Retention

Studies were done by different chemical treatments under solar dehydration of Green beans. The Green beans were treated by five different methods which are mentioned and the end product was underwent analysis for physico-chemical characteristics, nutritional characteristics, microbial analysis and sensory evaluation. Five treatments of different proportions with Magnesium chloride, Sodium chloride, Sodium bicarbonate and Magnesium oxide were done for solar dehydration of Green beans and (0.1% Magnesium chloride and 0.1% Sodium bicarbonate) treated Green beans were found to be good in all characteristics i.e. Physico-chemical (better chlorophyll retention) and nutritional characteristics when compared to other  treatments.

Integrated Leachate Treatment Technology

2020 ◽  
pp. 204-220
Author(s):  
Zawawi Daud ◽  
Halizah Awang
Keyword(s):  
Organic Compounds ◽  
Landfill Leachate ◽  
Combined Treatment ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Chemical Treatments ◽  
Physico Chemical ◽  
Effective Removal ◽  
Removal Of Heavy Metals ◽  
Pre Treatment

In this chapter, the performance of combined treatment of municipal landfill leachate is reviewed. Although individual physico-chemical treatments are suitable for the removal of heavy metals and hydrolyzation of some organic compounds, a combination of two physico-chemical treatments or physico-chemical and biological is required for optimum treatment of stabilized landfill leachate. A combination of two physico-chemical treatments can give optimum results in removal of recalcitrant organic compounds from stabilized leachate, as reflected by a significant decrease of the COD values after treatment. On the other hand, a combination of physico-chemical and biological treatments is required to achieve effective removal of NH3-N and COD with a substantial amount of biodegradable organic matter. In many cases, physico-chemical treatments are suitable for pre-treatment of stabilized leachate. The objective of this paper is to highlight various types of integrated leachate treatments as it has been difficult to get optimum efficiency from single approached treatment.

Effects of non-ionic surfactants on the uptake and hydrolysis of fluoresceindiacetate by alkane-oxidizing bacteria

2000 ◽  
Vol 46 (4) ◽  
pp. 387-390 ◽  
Author(s):  
Per Bruheim ◽  
Kjell Eimhjellen
Keyword(s):  
Cell Surface ◽  
Uptake Rate ◽  
Biological Effects ◽  
Quantitative Difference ◽  
Chemical Properties ◽  
Ionic Surfactants ◽  
Physico Chemical ◽  
Hydrolysis Of

Biological effects of non-ionic surfactants on alkane-oxidizing bacteria were studied by assessing their influence on the uptake of prefluorochrome fluoresceindiacetate (FDA) and its intracellular hydrolysis to fluorescein. Both decreasing and increasing rates of hydrolysis as a consequence of the presence of surfactants were observed. The surfactants influenced the uptake of FDA, but not its intracellular hydrolysis. The effects of the surfactants on the uptake rate depended strongly on the structure and physico-chemical properties of the surfactants. There was no qualitative or significant quantitative difference in surfactant susceptibility between induced (alkane grown) and non-induced bacteria (acetate grown), even though the induced cells possess greater cell surface hydrophobicity.Key words: fluoresceindiacetate, bacteria, surfactants, alkane.

Effect of combined physico-chemical treatments based on enterocin AS-48 on the control of Listeria monocytogenes and Staphylococcus aureus in a model cooked ham

Food Control ◽  
2010 ◽  
Vol 21 (4) ◽  
pp. 478-486 ◽  
Author(s):  
Samir Ananou ◽  
Alberto Baños ◽  
Mercedes Maqueda ◽  
Manuel Martínez-Bueno ◽  
Antonio Gálvez ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Listeria Monocytogenes ◽  
Chemical Treatments ◽  
Physico Chemical ◽  
Cooked Ham ◽  
And Staphylococcus Aureus
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