Most people are unaware of noise pollution occurring around them due to the characteristic of the pollution itself. This pollution is not visible to people’s sense and affects people based on their sound level acceptance. Since people who have high sound level acceptance are familiar with noise, thus noise pollution will not directly annoy them. This study was conducted to determine the traffic noise level at Seksyen 7, Shah Alam and its correlation with traffic volume. Since noise level will affect people in terms of annoyance and lead to health effect, the study area were chosen at intersections nearby residential area. The data of traffic noise level and traffic volume were collected representing weekday and weekend for each intersection. Three (3) data collection session were conducted for each day, which is in the morning (0730-0830), in the afternoon (1230-1330) and in the evening (1700-1800). The collected data were then being analysed and compared with the standard limit set by the Department of Environment Malaysia (DOE) to check whether the noise level at the study area comply with the limit recommended.

High turbidity in water not only will reduce the quality of water itself but it can give impact to the ecosystem as well. In water treatment, coagulation and flocculation are the process involved in removing turbidity. Chemical coagulant such as aluminium sulfate (Alum) and ferric chloride are effective way and widely used in order to remove the turbidity in water. However, these chemical coagulants have a side effect in spite of the effectiveness in turbidity removal, the usage of alum and other chemical coagulants bring concerns due to its impact to the environment, human health and economy. Therefore, natural coagulant is another alternative for turbidity removal in water treatment. Natural coagulant is a plant-based coagulant which can be used to replace chemical coagulants. These coagulants are generally cheaper and safer than chemical counterparts. This research is conducted to compare the effectiveness of natural based coagulant made from Psophocarpus tetragonolobus and chemical coagulant in improving the quality of raw water. Findings from this study showed P. tetragonolobus can remove turbidity up to 60 percent with 40 ml, 1% solution. Therefore, P. tetragonolobus can be considered as a potential resource for natural coagulant.

This research aimed to determine the suitability of citrus fruit peel waste namely as Citrus Aurantiifolia (key lime) and Citrus Microcarpa (kasturi lime) to act as a natural coagulant for water turbidity removal. The performance of these two coagulants was assessed in terms of turbidity removal using jar test experiments for synthetic low turbid water. The results indicated that the optimum dosage and turbidity removal for Citrus Microcarpa and Citrus Aurantiifolia was found at 30 mg/l with 75.6% turbidity removal and 60 mg/l with 74 % turbidity removal, respectively. Citrus Aurantiifolia showed higher removal efficiency as compared to Citrus Microcarpa. The study demonstrated that both citrus fruit peel waste has the potential to be use as a substitute for chemical based coagulant for a future alternative in water treatment.

Coagulation is one of the process in water treatment that mainly reducing turbidity of water by adding the coagulant such chemical or natural coagulant. Chemical coagulant such as Alum is widely used as it is efficient in removing tubidity. However, there are some adversed impact of chemical as coagulant to human and environment specifically. In this study, the effectiveness of Artocarpus Heterophyllus seed as natural coagulant were measured. There are two types the natural coagulant from Artocarpus Heterophyllus were considered in this study such as raw and dried seed. Besides, two different extraction process of coagulant by using distilled water and Sodium Chloride (1M NaCl) were used to determine the efficiency. The result showed dried Artocarpus Heterophyllus seed (1M NaCl) at 20mg/L achieved the optimum dosage of coagulant compared to dried Artocarpus Heterophyllus seed (distilled water), raw Artocarpus Heterophyllus seed (distilled water) and raw Artocarpus Heterophyllus seed (1M NaCl) in removing turbidity. It reduced up to 50% turbidity, and 70 %suspended solid after the treatment process. It also showed that salt Sodium Chloride (NaCl) can be used as addictive in treating the water.

In rural and isolated areas, there are limited clean and fresh water sources, which could be an issue for the people living in those areas. The use of solar distillation is used to treat the wastewater as an alternative to the fresh water sources. Thus, this study will determine the water quality of two different wastewater using solar water distiller and evaluates whether the treated water comply to the standard limit of drinking water from the Ministry of Health, Malaysia (MOH). The stormwater and greywater were used as water samples for the study. The physical properties investigated were temperature, colour, and odour while the chemical properties were total dissolved solids (TDS), ammonia, chlorine, hardness and pH value. The performance of solar water distiller was examined by considering the quality as well as the quantity of treated water. The relationship between the surrounding temperature, humidity and the volume of water collected was observed and recorded. The physicochemical parameters of the water after the treatment lies within the standard of MOH. Thus, the results demonstrated that the solar water distiller has potential as an alternative sustainable water treatment method.