Analysis of leachate from solidified peat soil

Ali Hauashdh,Radin Maya Saphira Radin Mohamed,Junita Abd Rahman,Junaidah Jailani,Yaacob Haryati,Mohd Yunus Nor Zurairahetty,Ibrahim Izni Syahrizal

doi:10.1051/matecconf/201825006015

Ali Hauashdh, Radin Maya Saphira Radin Mohamed + Show 5 more

Open Access

https://doi.org/10.1051/matecconf/201825006015

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Abstract

Peat soil is very compressible where this characteristic is lead to an excessive settlement. Solidification of peat soil is a method to improve engineering properties of peat soil. Currently, solidification of peat soil is increasing, wherefore it is a critical need to study the environmental effects from solidified peat soil leachate due to solidification peat mixtures usually used materials of generation wastes from coal-fired electric power. The effect of leachate from solidified peat to the environment is one of the most important criteria that should be investigated. This study aims to investigate the environmental impacts of leachate from solidified peat affected by rainwater. In this study, solidification of hemic peat soil was done by mixing hemic peat soil with ordinary Portland cement (OPC), fly ash (FA) and bottom ash (BA). Leachate is the liquid that has percolated through a soil column outlets. Therefore, this study was to analysis the leachate from solidified hemic peat when it is saturated by rainwater in two different conditions, which are a dry and wet season by using physical model (soil column). The leachate samples were analyzed by using Ionic Chromatography (IC) and Inductively Coupled Plasma Mass Spectrometry (IC-MS). The anions concentration of leachate from solidified peat has increased for Cl-SO42-in wet condition as result rainwater inflow was increased during the wet condition, and the chemical composition of rainwater contains Cl-and SO42-. The concentration of cations on the leachate from solidified peat has increased at Fe+2 and Al+3 in wet condition, which proven solidified peat has an effect on the leachate In comparison with leachate of non-solidified peat. The concentration of anions for Cl-and SO42-the leachate still consider in the normal range of groundwater concentration that classified as freshwater, but in case FA, BA, and OPC are used excessively in the mixture for solidifying peat in a wetland, leachate from solidified peat will effect on elements concentration of groundwater and land properties.

Highlights

There is about 2.7 million ha of peat and organic soils in Malaysia
Hemic peat is contained carbon represents in 89.9 %, this result obtained by organic content test and the remaining of hemic is chemical composition analysis by using X-Ray Fluorescence (XRF)
As this study aims to analyze the leachate from solidified peat, it is required for analyzing the chemical composition of materials that have been used as a mixture to for solidification of peat

Summary

Introduction

There is about 2.7 million ha of peat and organic soils in Malaysia. In Sarawak, peatlands are in abundance and Sarawak has the largest area of peat in the country, covering about 1.66 million ha and constituting 13 % of the state [1]. Since this organic soil is a result from the suitable condition of a lake river, this peat soil would have a very high percentage in organic content that is made of carbon and usually occurs in the area of wetland condition [3]. Peat mostly to cause settlement problems in construction and infrastructure development mainly comes from structures and highway constructions [5]. This study focuses on the leachate from solidified peat effects to environment when solidified peat saturated by rainwater

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