Application of Dual Coagulant (Alum + Barley) in Removing Colour from Leachate

Nur Shaylinda Mohd Zin,Zulazimie Azraff Zulkapli,M.J Zainorizuan,A Mohd Shalahuddin,O Mohamad Hanifi,L Alvin John Meng Siang,L Yee Yong,R Siti Nazahiyah

doi:10.1051/matecconf/201710306002

Nur Shaylinda Mohd Zin, Zulazimie Azraff Zulkapli + Show 6 more

Open Access

https://doi.org/10.1051/matecconf/201710306002

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Abstract

Coagulation/ flocculation is one of the treatment method for highly polluted leachate. One of the main affecting factor for this process is the coagulant used. Coagulant is divided into natural and chemical coagulant. In the current study, Alum (chemical coagulant) and barley (natural coagulant) were used as dual coagulant. The aim of this study is to examine the effectiveness of dual coagulant made from alum and barley in removing colour from the effluent of Simpang Renggam landfill leachate aeration lagoon through coagulation/flocculation method. Coagulation/flocculation process with single alum coagulant, single barley coagulant and dual coagulant (alum+barley) were examined by evaluating the optimum values of pH and dose. Optimum dose and pH for alum and barley as single coagulant were; 3 g/L & pH 5; 0.8 g/L & pH 6. Higher removal of colour was recorded for alum compared to barley. Application of alum and barley as dual coagulant had higher colour removal than alum and barley as single coagulant. The optimum pH and dose for dual coagulant were at pH 6, 3.0 g/L of alum and 0.8 g/L of barley respectively. However, at pH 6, 2 g/L alum and 1.6 g/L barley, the removal of colour was similar to alum at 3 g/L. It can be concluded that barley as coagulant aid able to reduce 33 % usage of alum at par removals of colour. Thus, the dual coagulant consist of alum and barley has the potential to be applied as a coagulant for leachate treatment.

Highlights

Increased number of population had causing enormous pressure on the local environment especially in solid waste management
In order to improve the effluent quality of SRL, this study aimed to examine the effectiveness of dual coagulant made from alum and barley as a coagulant for Simpang Renggam landfill aeration lagoon effluent
Colour efficiency of leachate effluent treated by single alum coagulant, single barley coagulant and dual coagulant were compared

Summary

Introduction

Increased number of population had causing enormous pressure on the local environment especially in solid waste management. The fast development in industrial sector and improved standard of living produces huge volume of solid waste. In Malaysia, it is a common practice that most of solid waste are disposed by using landfilling method. The negative outcomes of landfilling is the production of leachate. Leachate is characterised as a highly polluted liquid waste that contains high value of polluted matters such as ammonia, chemical oxygen demand, suspended solid, colour and etc. Proper treatment of leachate is crucial to maintain a healthy surrounding for living organism

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