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Formation of trihalomethanes in surface water and groundwater by using chlorine and chlorine dioxide as disinfectant

Formation of trihalomethanes in surface water and groundwater by using chlorine and chlorine dioxide as disinfectant / Nur Fatin Hanani Mohd Halid
Air merupakan unsur yang penting bagi manusia dan alam sekitar. Pencemaran air khususnya air minum disebabkan oleh virus, bakteria patogen dan mikroorganisma yang lain perlu dirawat sebelum disalurkan kepada pengguna. Disinfeksi merupakan satu proses yang penting dalam perawatan air bagi memusnahkan mikroorganisma yang terdapat di dalam air. Hasil daripada proses disinfeksi, pelbagai jenis hasil sampingan disinfeksi (DBP) terhasil dan ianya didapati menjejaskan kualiti air minum dan boleh membahayakan kesihatan manusia dimana ianya bersifat karsinogenik. Selain daripada klorin, penggunaan disinfektan lain seperti klorin dioksida juga didapati mampu membunuh mikroorganisma yang terdapat di dalam air. Oleh itu kajian ini dijalankan bagi membandingkan penggunaan klorin dan klorin dioksida sebagai disinfektan dalam penghasilan trihalometana dan untuk menghubungkaitkan tahap penghasilan THM menggunakan disinfektan klorin dan klorin dioksida terhadap pH. Berdasarkan hasil kajian yang dijalankan, klorin didapati menghasilkan trihalometana yang lebih tinggi berbanding klorin dioksida. Berdasarkan hasil kajian pada air bawah tanah, TTHM maksimum dijumpai pada pH 7 dalam tempoh masa 24 jam dengan jumlah trihalometana sebanyak 49.4 μg/L dengan penggunaan klorin sebagai disinfektan, manakala jumlah TTHM terendah juga berada pada pH 7 dalam tempoh masa 3 jam dengan penggunaan klorin dioksida sebagai disinfektan dengan jumlah TTHM sebanyak 5.4 μg/L. Hubungan disinfektan terhadap pH tidak menunjukkan hubungkait yang jelas memandangkan terdapat penurunan dan penaikan jumlah TTHM yang berbeza pada setiap pH _______________________________________________________________________________________________________ Water is an important element for human and environment. Water pollution in drinking water which was caused by viruses, bacteria, pathogens and microorganisms need to be treated before being distributed to the consumers. Disinfection is one of the important process in treating water to kill microorganisms. Disinfection process causes the formation of disinfection by products (DBP) which affect the quality of drinking water and can harm human health due to its carcinogenic. The use of other disinfectant such as chlorine dioxide can also be used to kill microorganisms in water. Therefore, this study was carried out to compare the formation of trihalomethanes using chlorine and chlorine dioxide as water disinfectants and to find the relationships between chlorine and chlorine dioxide to pH. Based on the study, chlorine is found out to formed high trihalomethanes compared to chlorine dioxide. Based on the study on the groundwater samples, the maximum TTHM were found at pH 7 in the contact time of 24 hours with the value of 49.4 μg/L with the used of chlorine as disinfectants, while the minimum value of trihalomethanes found is also at pH 7 in the contact time of 3 hours with the used of chlorine dioxide as the disinfectants with the value of 5.4 μg/L. The relationships of disinfectants used in this study to pH does not shows a strong relationship since there were different fall and increment of total trihalomethanes at every pH.
Contributor(s):
Nur Fatin Hanani Mohd Halid - Author
Primary Item Type:
Final Year Project
Identifiers:
Barcode : 00003106743
Accession Number : 875006866
Language:
English
Subject Keywords:
Water pollution; Disinfection; microorganisms
First presented to the public:
6/1/2017
Original Publication Date:
3/20/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Civil Engineering
Citation:
Extents:
Number of Pages - 72
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-03-20 16:41:54.082
Date Last Updated
2020-05-27 17:45:48.603
Submitter:
Mohd Jasnizam Mohd Salleh

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Formation of trihalomethanes in surface water and groundwater by using chlorine and chlorine dioxide as disinfectant1 2018-03-20 16:41:54.082