Coagulation-flocculation process in landfill leachate treatment: focus on coagulants and coagulants aid

Link to publisher's homepage at https://iopscience.iop.org/In physico-chemical treatment, the separation of suspended particles from the liquid phase is usually accomplished by coagulation, flocculation and sedimentation. Coagulation-flocculation processes have been widely used as alternative treatment to remove leachate pollutants such as BOD, COD, TSS, heavy metals, colour, and nitrogen compounds prior to other treatment methods. It is often coupled with treatment methods like biological process, chemical oxidation, adsorption or filtration to achieve desirable effluent quality. In spite of being economical, the dewatering and disposal of the precipitated sludge could be laborious and time-consuming. In this manuscript, brief discussions on coagulant and coagulants aid in landfill leachate treatment is discussed with respect to their mechanis

Statistical Determination for Eco-Friendly Composite Adsorbent Preparation for the Removal of COD, Colour and Cu(II) from Textile Effluent

506-511This study evaluates the effect of preparation conditions for the production of eco-friendly composite adsorbent for the removal of COD, colour and Cu(II) from actual textile effluent by adsorption. The composite adsorbent was prepared by determining the optimum ratio of limestone powder (LP) and palm shell activated carbon (CSAC) as the precursors. Viscous gum (AG) which was extracted from brown seaweed (Laminaria digitata) was mixed with the precursors during the adsorbent preparation as the binding agent. From laboratory experimental and statistical analysis, the preparation condition of the composite adsorbent indicated that the models developed for COD, colour and Cu(II) removals showed higher coefficient of determination with more than 94% which reflects good agreement between calculated and the observed results. The findings also demonstrated that CSAC, LP and AG dosage had significant relationship towards parameters removal when tested with three dimensional plots. The optimization procedure revealed that 7 g CSAC, 3 g LP and alginate binder ratio of 2.49% (w/v) were the best preparation condition that could remove 81.10%, 83.60% and 79.50% of COD, colour and Cu(II), respectively

Heterogeneous fenton-like reaction using Fe_3-xMn_xO₄-MKSF composite catalyst for degradation of acid orange II dye

Abstract The selection of a good catalyst support is crucial in contributing towards the enhancement catalytic activity of a catalyst. Therefore, in this study, the influence of montmorillonite KSF (MKSF) clay loading in relation with catalytic performance of the resultant composite catalyst has been investigated. The MKSF clay loading were varied at x = 20, 40, 60 and 80 wt%, respectively. Interestingly, Fe3-0.3Mn0.3O4-MKSF(40wt%) has shown greater catalytic performance up to 98% of acid orange II (AOII) dye removal in comparison to the Fe3-0.3Mn0.3O4 and Fe3O4 catalysts. The AOII degradation kinetic using Fe3-0.3Mn0.3O4-MKSF(40wt%) was fitted well with first-order reaction kinetic and the reaction rate increased in the order of Fe3O4&gt;Fe3-0.3Mn0.3O4&gt;Fe3-0.3Mn0.3O4-MKSF(40wt%). It also demonstrated in the work that Fe3-0.3Mn0.3O4-MKSF(40wt%) catalyst can be reused several times without affecting its efficiency. Thus, it can be suggested that MKSF clay as catalyst support played a significant role in enhancing the overall catalytic performance of Fe3-0.3Mn0.3O4 catalyst during the heterogeneous Fenton-line reaction as well as the degradation kinetics of the AOII solutions.</jats:p