PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL Volume 6, Number 1, 2020
molecular weight of CPAME-uhc can be increased to 14 to 15 million by process optimization, and the solubility of CPAME-uhc can be greatly increased by adding urea and Na2SO4. The temperature/salt resistance of CPAME-uhc can be improved by adding 2 wt% N,N-dimethylacrylamide, 2 wt% N-vinylpyrrolidone, and 5 wt% sodium 2- acrylamide-2-methylpropionate, based on the total monomer weight. When CPAME-uhc was added to papermaking wastewater the removal percentages of chemical oxygen demand (COD) and suspended solid (SS) were 95% and 93%, respectively. This study provides a useful reference for the preparation, optimization and application of CPAME- uhc. Treatment Technologies for Addressing the Removal of Industrial Effluents Affecting the Quality of Ganges River in Eastern Part of Uttar Pradesh, India, Sumedha Shah & Abha Mishra, Combined Application of Physico-Chemical & Microbiological Processes for Industrial Effluent Treatment Plant, pp.29-46 (Springer) . India has emerged as a hub for research and development and is ready for escalating to fourth industrial revolution. The fourth level revolves around fusion of technologies for elevating the upcoming manufacturing techniques. Industrialization has helped India to flourish and grow economically among the other developing countries. With all the advantages of increase in industries and production, there comes up the problem of increase in pollutants and contaminants that are discharged untreated. The various sectors of industries in India include textile, cement, mining, food processing, chemical, steel, and dairy. They produce a mixture of toxic and nontoxic pollutants that may or may not be persistent in nature. These pollutants are majorly carcinogenic or become one over their due course of time if not treated. The text focuses on treatment technologies of waste water in the eastern part of Uttar Pradesh, an industrial state in India, where most of the industries are by the side of Ganges River. These industries generate significant amount of waste most likely being chemical and synthetic dyes, heavy metals, and pesticides which are persistent pollutants. The treatment of effluent is essential to stabilize the BOD and COD and reduce presence of heavy metals in river water. The various treatment technologies are used individually or in combination to have effective retaliation and applicability. Humidity impact on photo-catalytic degradation: Adsorption behavior simulations and catalytic reaction mechanisms for main gaseous pollutants in papermaking industry, Zhifeng Lin et al, Journal of Cleaner Production, Vol.244. To adopt cleaner production technology of photo-catalysis in papermaking industry and improve environmental sustainability, it is essential to understand the impact of ambient humidity on photo-catalytic degradations of gaseous pollutants. This study used TiO2 colloid as catalyst to study the effects of ambient humidity (30 – 60%) on the photo-catalytic degradations of formaldehyde (HCHO), benzene (C6H6), and hydrogen sulfide (H2S) generated by papermaking industry. Via adsorption behavior simulations, using density functional theory (DFT) and catalytic reaction mechanisms, the effects of humidity were further investigated. The following results were found: (1) With increasing humidity, the degradation of HCHO was inhibited, because the ambient H2O content exceeded the demand for hydroxyl radicals produced by H2O, which led to competitive adsorption. (2) For C6H6, an optimum humidity of 40% was identified during the degradation process, which could be attributed to the improved catalytic reaction and the subsequent excessive H2O content. (3) For H2S, unlike the negative action for HCHO and the first positive and then negative actions for C6H6, with increasing humidity, the H2S degradation was promoted. This indicated that the large demand for hydroxyl radicals produced by H2O promoted the H2S catalytic reaction. Combining experimental, simulation, and theoretical
Technical Abstracts
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