Razi Ikhwan

Motorcycle riders with noise sensitivity (NS) may suffer from degraded health-related quality of life (HRQOL) because they are exposed to acute noise levels on a daily basis. This study was aimed to identify the relationship between NS and HRQOL among young motorcycle riders (undergraduate university students) aged between 19 and 25 years (n = 301) through a cross-sectional questionnaire-based study, that is, Weinstein noise sensitivity scale and the World Health Organization Quality of Life. The effects of NS on HRQOL were assessed based on gender, the years of motorcycle driving experience, and noise sensitive among groups using one-way analysis of variances with an alpha value of 0.05. The results showed no significant difference in NS between males and females. On the other hand, motorcycle driving experience for <4 years displayed a higher tendency toward NS. Moreover, a significantly (P = 0.004) decreasing trend among low, moderate, and high NS with their respective HRQOL was observed, while a high NS showed significantly (P = 0.015) lower scores on the social domain of the quality of life. The overall premise of the study has statistical significance and shows that individuals with high NS tend to have degraded HRQOL compared to individuals with low NS. Furthermore, in-depth studies are required from the other demographical background of participants to investigate the motorcyclist's NS and HRQOL as an integral requirement for the rider's safety and health.

Introduction: Textile industry is known as one of the generators that produced a large amount of wastewater pollutants due to the large quantities of water consumed during fabric processing. Objective: The objective of this study is to investigate the potential of eggshells as adsorbent for removal of pollutants from the textile industry wastewater without treatment. Methodology: The wastewater sampling at the selected area was conducted to identify the characteristics of the wastewater and compare the sample with Environmental Quality (Sewage and Industrial Effluent) Regulations 1974. Therefore, alternative treatment such as adsorption by using eggshell was investigated with different variables. Result: Based on the result, the wastewater does have a high reading of turbidity, high concentrations of BOD and COD, highly coloured effluents and heavy metals. All the characteristics of textile wastewater violated the permissible limit standard. The optimum condition in the removal of h...

Objective : The main objective of this study was to characterize the physicochemical characteristics of the closed landfill of Sungai Kembong and Ampar Tenang in Kajang, Selangor. The efficiency of leachate treatment was also evaluated. In addi- tion, acute toxicity of the leachate effluent were tested using Syprinuscarpio species. Method : The physicochemical parameters of leachate were determined according to APHA standard methods. The acute toxicity was conducted according to the OECD Guideline. Result: The leachate from both landfill are categorized as stabilized landfill leachate. The treatment manage to significantly decrease the toxicity, BOD, COD and NH 3 N concentration but the final concentration still above the allowable standard limit. Conclusion : Biological treatment is not sufficient to reduce the pollutants level below the discharge standard and require further additional treatment. However, the initiative to install the leachate treatment facility to the former open...