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The IUP Journal of Structural Engineering :
The Effect of Blast Load on Three-Dimensional High-Rise Steel Frame Structure
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In the paper, the landfill leachate was treated using adsorption by clay base system and coagulation, followed by modified Fenton oxidation process. Initially, experiments were conducted using bentonite clay. There was only 46% reduction for nitrate, 50% for COD and 42.7% for color, but the results obtained were not satisfactory. Hence, coagulation followed by modified Fenton process was carried out. In this process, Zero Valent Iron (ZVI) was used as the iron catalyst. Before oxidation process, coagulation was carried out using alum as the coagulant; the reduction for color was best for the dosage of 10 mL of 120 g/L of alum. The reduction in wastewater characteristics after the modified Fenton oxidation process using 1.5 g of ZVI as iron catalyst was 92% for nitrate and 82% for COD. 99% reduction in color was also observed.

 
 

Tchnobanoglous et al. (2002) defined leachate as “the liquid that has percolated through the solid waste which comprises suspended solids and heavy metals”. The composition of the leachate varies on the age of the landfill and even the phase of decomposition of the leachate. For example, if leachate is in acid phase of decomposition, the pH of the leachate will be in acidic range; whereas if the sample is collected in methane fermentation phase, the pH will be in the range of 6.5-7.5 and the BOD5, COD and TOC will have low concentration. Similarly, the concentration of heavy metals present in the leachate is also lower because most metals are less soluble at neutral pH.

Kamaruddin et al. (2013) reported that the leachate treatment has been very much complicated as it contains excessive concentration of biodegradable and non-biodegradable organic matter, phenols, ammonia nitrogen, phosphate, heavy metals, and sulfide. If this is not treated properly and disposed, then this would result in the contamination of surface and ground water, as it may percolate through the soils and subsoils causing adverse impact on the receiving water bodies.

Zhang et al. (2010) reported that Fenton process is more readily employed to treat landfill leachate, as it is much cheaper and easier to operate compared with other oxidation processes. Although photo-Fenton process is superior to conventional Fenton process, it is technically less practicable in that the penetration distance of UV light would be limited in the leachate and the effectiveness of photolysis depends on the wavelength, and accordingly the optimized quantum yield is obtained in a narrow range of wavelength. Therefore, the photo-Fenton process may not be successful in field application.

In this study, the treatment of landfill leachate was done using various treatment methods, such as adsorption using clay base system and coagulation followed by modified Fenton process, and the results are discussed.

 
 

Bentonite clay, Coagulation, COD, Modified Fenton’s process, Nitrate, ZVI