Papers by Keyword: Wastewater Treatment

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Authors: Ji Bai Wang, Ming Liang Ni
Abstract: A novel magnetic ion exchange resin called MIEX Resin is being utilized in potable water treatment, which indicates significant advantages. The objective of this article is to analyze characteristics and application of MIEX Resin in engineering projects, and hence provide critical review on merits and demerits of the resin. Furthermore, researches on combination of MIEX Resin with other water treatment technologies would be analyzed and discussed to prove potential that a MIEX Resin process integrated with other treatments can be employed in broader fields of wastewater treatment and reuse.
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Authors: Yong Juan Zhang, Min Zhang, Xin Yao, Yong Feng Li
Abstract: Microbial fuel cell (MFC) was used to treat organic wastewater and heavy metal waste water treatment in this test. At the same time, organic waste water tank with the oxidation is taken as the battery anode; heavy metal waste water tank with reduction is taken as the cathode of the battery. The results showed that under the same conditions, with copper ion solution as a cathode liquid solution of MFC, the maximum voltage was 61.6mV, the maximum electric power density was 147.4 mW / cm2, and COD removal rate was relatively stable, and reached 68.67%; but when copper ion solution was taken as cathode solution, the maximum voltage was 36.9mV, the maximum electric power density was 43.7 mW / cm2, and COD removal rate changed heavily and reached 58.62%. The results shows that from the point of produce electricity and wastewater treatment, silver ions are better than copper.
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Authors: Ming Yan Shi, Yan Gao
Abstract: In order to frame a perfect formulation called ‘The rule of small sewage amount treatment engineering design’, it has been investigated into the life wastewater discharge in some typical residential areas in Nanjing and Yangzhou, China. Also, the effect of economy level on daily discharge amount of life wastewater has been investigated. During the investigation, the effects made by temperature and economy level on daily discharge amount of life wastewater are emphasized. And the results show that, the hourly and daily fluctuations of life wastewater discharge are closely related to people's life habit, temperature and income level.
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Authors: Kai Li Zhang, Li Wei Xie, Li Hong Huang, Zong Qiang Zhu, Liang Liang Tan
Abstract: Compared with the treatment of heavy metal waste water by bamboo charcoal and modified bamboo charcoal. The mainly types and methods of modified bamboo charcoal adsorption of pollution water is introduced. some important factors that effecting the bamboo charcoal and modified bamboo charcoal adsorption of heavy metal pollution were described in detail, summarizes the desorption method of the specific adsorbent and adsorption mechanism.
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Authors: Sittinun Tawkaew, Tawan Sooknoi, Angkhana Jaroenworaluck, Thammarat Panyathanmaporn, Sitthisuntorn Supothina
Abstract: A photocatalytic system for wastewater treatment from textile industries was constructed and tested for its efficiency. The system consisted of two units – a photoreactor for dye decomposition and a catalyst recovery unit. The photoreactor was an annular plug flow photoreactor under irradiation of 36 W Toshiba blacklight. The catalyst recovery unit was 42 L of sediment tank for TiO2 catalyst recovery. In our study, a Cibra Cron red R-W 150% (an anionic azo dye) was used to prepare a synthetic textile wastewater. The experimental parameters such as flow rate, pH, dye initial concentration, catalyst loading and setteled time that affected the system performance were investigated. The photodegradation kinetics were found to follow the Langmuire - Hinshelwood model and also depended on the TiO2 concentration and the pH. The optimum condition for photocatalytic decomposition was at pH 3 and at 1 g/L of TiO2 catalyst loading. The reaction rate constant, k and the adsorption constant, K for the scale-up photoreactor were 3.345 mg/L-min and 0.0204 L/mg, respectively. For the catalyst recycle unit, the overflow and underflow concentration of the TiO2 catalyst were 2.00 and 0.002 mg/L, respectively, at 100 ml/min of inlet flow rate, 50 ml/min of overflow and 50 ml/min of underflow.
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Authors: Xiao Li Wang, Chen Wu, Jia Qi Zhang, Qiang Long Chi, Si Si Tian
Abstract: In this paper, it has been studied the acclimation stage of a synthetic wastewater fed with glucose as a carbon source, using a tow-chambers microbial fuel cells (MFCs). Special attention has been paid to the start-up. During the acclimation period, the microbial fuel cells (MFCs) will be exposed to variations in operating parameters. Hence, the acclimation stage of MFCs, exposed to variation in the influent COD, operating temperature, and electron acceptor, was investigated in the terms of power density, COD removal efficiency, and voltage while treating a synthetic wastewater. The power density is increased and the acclimation period is prolonged with the increase of the influent COD up to meet steady-state conditions. It is important to note that the acclimation of MFCs is not only impacted by the electricity-generating bacteria, but by the whole biological. The highest steady-state voltage, which is about 404mV, is obtained at 35°C, comparing to the operating temperature of 15°C or 25°C. In addition, the electron acceptor will obviously influence the steady-state voltage and start-up period.
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Authors: Zalilah Murni Yunus, Norzila Othman, Rafidah Hamdan, Nurun Ruslan Najwa, Norfarihah Abu Kasin, Nur Solini Leman
Abstract: In this study, activated carbon (AC) was produced from honeydew rind, a low-cost agricultural by-product, by chemical activation using H2SO4 as an activator was used as an adsorbent for the removal of zinc ions from aqueous solutions. Preparation method on the effect of surface morphology at different carbonization temperatures 450°C, 470°C, 490°C and 510°C was studied. The AC was characterized using FEM-SEM, FTIR and TG. Batch adsorptions were carried out to optimize different variables such as zinc concentration, contact time, pH and biosorbent amount. The results from AAS analysis showed that the maximum adsorption of zinc onto honeydew rind AC was achieved at the conditions of pH 7.5, 1.5g biosorbent amount, 1000mg/L initial zn concentration and 45min contact time. The maximum metal uptake and maximum removal were 66.55mg/g and 99.79% respectively.
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Authors: Jian Feng Ma, Jian Ming Yu, Bing Ying Cui, Ding Long Li, Juan Dai
Abstract: Inorganic-organic-bentonite was synthesized by modification of bentonite by Hydroxy-iron and surfactant, which could be applied in dye removal by adsorption and catalysis. The removal of acid dye Orange II was studied at various factors such as time and pH of solution. The results showed that the inorganic-organic-bentonite could efficiently remove the dye with efficiency of 96.22%. The maximum adsorption capacity is 76 mg/g. The pH of solution has significant effect on both adsorption and catalysis. When pH was 4, the maximum removal efficiency of adsorption and catalysis were 97.57% and 87.23%, respectively. After degradation, the secondary pollution was diminished and the bentonite could be reused.
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Authors: Xiao Yan Tan, Fang Zhao, Rui Zhi Wen, Yu Dai
Abstract: Commercially available coal-based activated carbon was treated with different concentration of nitric acid. The resultant samples were used to adsorb lead from aqueous solution. N2 adsorption, Boehm titration, point of zero charge (pHPZC) and X-ray photoelectron spectroscopy (XPS) were used to characterize the samples. Acidic pH is favorable for Pb(Ⅱ) adsorption. The acidic groups increase significantly with the increment of the concentration of nitric acid during the treatment. The carboxylic groups of surface carbon play an important role in the adsorption process.
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Authors: Xiao Yan Tan, Guo Lan Li, Song Li
Abstract: Coal-based Activated carbon was modified by thermal and nitric acid treatment to adsorb phenol from aqueous solution. Boehm titration, point of zero charge ( pHPZC ) and X-photoelectron spectroscopy (XPS) were used to characterize activated carbons. Acid treatment leads to the increase of the content of surface oxygen, whereas thermal treatment causes the decrease of the content of surface oxygen.The surface characteristics of activated carbons have significant effect on phenol adsorption. The adsorption isotherms of phenol adsorption are described by Langmuir isotherm. The kinetic studies indicate that the adsorption process is fitted well by the pseudo-second- order kinetics.
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