Dalam perjalanan kita memasuki ke abad kedua puluh satu, gaya hidup manusia telah
mengevolusi lebih kepada menikmati kehidupan sementara sikap bena tak bena
manusia terhadap alam sekitar semakin menular dalam masyarakat. Sisa pepejal
meningkat dengan drastik setiap tahun, selaras dengan kepekatan pencemar berbahaya
dalam larut lesapan. Penyusupan larut lesapan ke dalam badan air tidak dapat dinafikan
akan menyumbang kepada pencemaran alam sekitar. Walaupun penggunaan trivalen
koagulan berasaskan logam telah digunakan secara meluas dalam olahan larut lesapan,
ia masih tidak mencukupi untuk mencapai standard kualiti air disebabkan oleh
kepekatan tinggi pencemaran dalam larut lesapan dari tapak pelupusan. Oleh itu, kajian
ini dijalankan bertujuan untuk mengolah larut lesapan dari Tapak Pelupusan Alor
Pongsu (APLS) melalui aplikasi koagulan berasaskan logam tetravalent timah (IV)
klorida (SnCl4) di bawah keadaan yang terbaik dengan menyingkirkan UV254, SS,
COD, ammonia nitrogen dan warna. Tambahan pula, sikap pengenapan enapcemar
dinilai supaya mempunyai pemahaman yang lebih baik mengenai mekanisme
penggumpalan dan pengelompokan. Zeta potensi dan purata saiz zarah bagi koagulan
dan larut lesapan ditentukan untuk meramalkan keadaan terbaik pH dan dos. Proses
penggumpalan-pengelompokan pada pH 5 dengan 150 g/L timah (IV) klorida mampu
menyingkirkan 68.75% UV254, 98.68% SS, 66.5% COD, 8.59% ammonia nitrogen dan
94.6% warna. Kadar pengenapan enapcemar adalah tinggi dengan nilai 3.84 cm/min
ketika dos dalam keadaan terbaik manakala indeks volum enapcemar dilaporkan
sebagai 30 mL/g, menunjukkan pengenapan dan pemadatan enapcemar yang baik.
Secara ringkas, timah (IV) klorida mempunyai potensi dalam olahan larut resapan.
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As we move into twenty-first century, human lifestyle has altered in all sorts of ways.
While most of the people are indulged in enjoying their own lives, it seems that the
obliviousness to the environment starts to shroud the entire society. Solid waste is
generated exponentially each year, in line with the concentration of harmful
constituents in leachate. Infiltration of leachate into water bodies undeniably will lead
to environmental degradation. Although the use of trivalent metal-based coagulants has
been employed widely in treating leachate, it is still inadequate to achieve the water
quality standard due to the presence of high concentrations of pollutants in landfill
leachate. Hence, this study is conducted which aims to treat landfill leachate from Alor
Pongsu Landfill Site (APLS) through the application of tetravalent metal-based
coagulant which is tin (IV) chloride (SnCl4) under best conditions by removing UV254,
SS, COD, ammonia nitrogen and colour. Furthermore, sludge settling behaviour is
determined to have a better understanding on the coagulation-flocculation mechanism.
Zeta potential and average particle size of both coagulant and leachate were predetermined
to predict the best condition for pH and dosage. The coagulationflocculation
process, under best condition of pH 5 with 150 g/L tin (IV) chloride was
capable of eliminating 68.75% of UV254, 98.68% of SS, 66.5% of COD, 8.59% of
ammonia nitrogen and 94.6% of colour. Sludge settling rate was high with the value of
3.84 cm/min at best condition for dosage whereas the sludge volume index was
reported as 30 mL/g, indicating good settling and compaction of sludge produced. In a
nutshell, tin (IV) chloride has potential in treating landfill leachate.
Potential use of tin (IV) chloride as coagulant to treat landfill leachate from alor pongsu landfill site / Lau Jian Ning