Forthcoming articles

 


International Journal of Environmental Engineering

 

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International Journal of Environmental Engineering (3 papers in press)

 

Regular Issues

 

  • Feasibility studies of using domestic wastewater for landscape irrigation purposes near a nuclear power plant   Order a copy of this article
    by Muhammad Saleem, Usman Jabbar 
    Abstract: The current domestic wastewater treatment unit in a local Nuclear Power Plant (Karachi) was found to bring major wastewater parameters to ranges suitable for landscape irrigation purposes according to US-EPA and Jordanian standards, except for TSS, BOD5, and coliforms. The inclusion of a sedimentation basin was found to reduce suspended solids to 30 mg/l and coliform by 40-50%, which was a relatively insignificant improvement. In order to improve the wastewater treatment facility further, laboratory runs were conducted by passing treated wastewater through a Slow Sand Filtration (SSF) unit for 168 hours. SSF unit was found to reduce TSS by 81.7%, BOD5 by 71.7% and fecal coliforms by 99.75%. As a result, it is recommended to include both a sedimentation basin as well as an SSF unit in the wastewater treatment train in the future to allow treated wastewater from the Nuclear Power Plant to meet international standards for landscape irrigation.
    Keywords: Treated wastewater; Landscape irrigation; Nuclear Power Industry; sedimentation; fecal coliforms; SSF.

  • The Application of Crosslinking Oil Palm Trunk Starch (C-OPTS) Coagulants for Landfill Leachate Treatment   Order a copy of this article
    by Mohd Suffian Yusoff, Hamidi Abdul Aziz, Mohd Faiz Muaz Ahmad Zamri 
    Abstract: Coagulation-flocculation has been extensively used as a semi-aerobic landfill leachate treatment, prior to other treatment methods. Polyaluminium Chloride (PAC) coagulants is prominent in landfill leachate treatment, however the application of PAC may introduce potentially harmful residuals into the aquatic environment. In this study, crosslinked starch-based coagulants had been produced from oil palm trunk waste (C-OPTS). To date, no attempt has been made to avail crosslinked oil palm trunk starch application in landfill leachate treatment. Based on the results, C-OPTS can be employed as coagulants. Jar test results had ascertained that optimum pH and dosages value for C-OPTS and PAC Indeed, no pH adjustment was required for C-OPTS and its optimum dosage was only one-eighth of PAC optimum dosage. Therefore, C-OPTS would be an alternative coagulant substituting PAC, depending on leachate condition. The overall findings concluded that C-OPTS were feasible for landfill leachate treatment in terms of coagulation performance and sustainable environmental management.
    Keywords: Starch; Oil Palm Trunk; Natural Coagulant and Landfill Leachate.

  • Polyaluminium chloride and flocculation aids for color removal from biologically treated textile mill effluent   Order a copy of this article
    by Gemima Santos Arcanjo, Pedro Henrique Guerra Alves, Rafael Kopschitz Xavier Bastos, Leonardo Oliveira Cordeiro 
    Abstract: The objective of this work was to construct the polyaluminium chloride (PACl) diagram of coagulation for secondary effluent from a textile industry in order to determine the best coagulant dose and coagulation pH. PACl doses vary between 200 and 450 mg/L with pH values from 4.5 to 8.0. In addition, it was evaluated the effect of applying a copolymer of acrylamide and sodium-acrylate as a flocculation aid and the addition of a decolorant, composed by dicyandiamide, to increase the color removal efficiency, at the best coagulant dose and pH obtained. Apparent color removal of 70% was reached in the pH range and coagulant dose predicted for the enhanced coagulation process: high coagulant doses, between 200 and 450 mg/L; and low coagulation pH, between 4.5 and 5.0. The application of the copolymer and the decolorant resulted in an apparent color removal between 10 and 30% less than the efficiency obtained with PACl application. These results indicate the need for further studies to optimize the application of these combined products with the PACl and improve the color removal from textile mill effluent.
    Keywords: Polyaluminium chloride; enhanced coagulation; textile effluent.