D. Samuel Suman Raj

Bio: D. Samuel Suman Raj is an academic researcher from Jawaharlal Nehru Technological University, Hyderabad. The author has contributed to research in topics: Fermentation & Effluent. The author has an hindex of 3, co-authored 3 publications receiving 1318 citations.

Decolourization of industrial effluents - available methods and emerging technologies - a review

Abstract: Water pollution control is presently one of the major thrust areas of scientific research. While coloured organic compounds generally impart only a minor fraction of the organic load to wastewaters, their colour renders them aesthetically unacceptable. Stringent regulating measures are coaxing industries to treat their waste effluents to increasingly high standards. Colour removal, in particular, has recently become an area of major scientific interest as indicated by the multitude of related research reports. During the past two decades, several decolourization techniques have been reported, few of which have been accepted by some industries. There is a need to find alternative treatments that are effective in removing dyes and colourants from large volume of effluents, which are cost-effective, like the biological or integrated systems. This article reviews some of the widely used and most promising industrial wastewater decolourization methods. Data on decolourizing efficiencies of different causative agents, obtained by means of different physical, chemical and biological methods are discussed. Further a critical review is made on the various treatment methodologies and emerging technologies with a note on their advantages and disadvantages.

A review on impact of carbonated milk beverages on human health

Abstract: Carbonated milk beverages are drinks produced by the fermentation process (addition of yeast) and carbonated by mechanical or physical method. Recent studies show the consumption of carbonated milk beverages are becoming popular due to their nutritional and therapeutic effects. Products like kefir, koumiss, carbonated probiotic drinks and sparkling milk. According to research kefir has different health benefits like gastrointestinal proliferation, anti-bacterial spectrum, an anti-carcinogenic effect due to the presence of lactic acid formed during fermentation. It is also good for those who are lactose intolerant because of the high B – galactosidase activity enzyme which helps break down lactose sugar. Koumiss is first used by Mongolian people to treat tuberculosis, ulcers and hepatitis. It is rich in vitamin C, A, E, D and antibiotics. Carbonated probiotic drinks help in maintaining cholesterol level because lactic acid hinders the growth of bacteria in the small intestine by attaching the hexagen. Carbonated blueberry flavoured milk helps to reduce the risk of cardiovascular diseases, anti-inflammatory effects and some forms of cancer because blueberry is a source of vitamins, flavonoids and other phenolic compounds (anthocyanins).

Advantages and disadvantages of techniques used for wastewater treatment

Abstract: During the last 30 years, environmental issues about the chemical and biological contaminations of water have become a major concern for society, public authorities and the industry. Most domestic and industrial activities produce wastewaters containing undesirable toxic contaminants. In this context, a constant effort must be made to protect water resources. Current wastewater treatment methods involve a combination of physical, chemical and biological processes, and operations to remove insoluble particles and soluble contaminants from effluents. This article provides an overview of methods for wastewater treatment, and describes the advantages and disadvantages of available technologies.

Bacterial decolorization and degradation of azo dyes: a review.

Abstract: A variety of synthetic dyestuffs released by the textile industry pose a threat to environmental safety. Azo dyes account for the majority of all dyestuffs, produced because they are extensively used in the textile, paper, food, leather, cosmetics and pharmaceutical industries. Existing effluent treatment procedures are unable to remove recalcitrant azo dyes completely from effluents because of their color fastness, stability and resistance to degradation. Bacterial decolorization and degradation of azo dyes under certain environmental conditions has gained momentum as a method of treatment, as these are inexpensive, eco-friendly and can be applied to wide range of such dyes. This review mainly focuses on the different mechanisms of decolorization and discusses the effect of various physicochemical parameters on the dye removal efficiency of different bacteria. The enzymatic mechanisms involved in the bacterial degradation of azo dyes, the identification of metabolites by using various analytical techniques, and the nature of their toxicity has been investigated. This review provides an overview of bacterial decolorization/degradation of azo dyes and emphasizes the application of these processes for the treatment of azo dye-containing wastewaters.

Advanced Oxidation Processes for Wastewater Treatment: Formation of Hydroxyl Radical and Application

Abstract: Advanced oxidation processes (AOPs), defined as those technologies that utilize the hydroxyl radical (·OH) for oxidation, have received increasing attention in the research and development of wastewater treatment technologies in the last decades. These processes have been applied successfully for the removal or degradation of toxic pollutants or used as pretreatment to convert recalcitrant pollutants into biodegradable compounds that can then be treated by conventional biological methods. The efficacy of AOPs depends on the generation of reactive free radicals, the most important of which is the hydroxyl radical (·OH). The authors summarize the formation reactions of ·OH and the mechanisms of pollutants degradation. They cover six types of advanced oxidation processes, including radiation, photolysis and photocatalysis, sonolysis, electrochemical oxidation technologies, Fenton-based reactions, and ozone-based processes. Controversial issues in pollutants degradation mechanism were discussed. They review t...