Rangkui River flows across Pangkal Pinang City, the capital of Bangka Belitung Province. Land uses vary and can inevitably be pollution hot-spots for this river. This study aimed to investigate the current status of Rangkui River based on bacterial indicators in association with other water quality parameters. The sample collection was completed in March 2017 within 6 stations. Water quality parameters observed were temperature, TSS, turbidity, pH, DO, salinity, BOD, COD, Nitrate and Phosphate. The results of faecal coliform observation indicated that the stations closer to upstream (station 1, 2, 3) showed lower faecal coliform concentration (530-940 MPN/100 ml) as compared to those closer to downstream (station 4, 5, 6) which had the amount of ∼11,000 MPN/100 ml. Phylogenetic study emphasized that isolates of interest were more similar to Escherichia group. The water from Rangkui River could be classified from Class I to Class IV according to Indonesia Government Regulation No.82/2001. PCA revealed Station 3 and 6 obviously separated from other stations so that more concerns should be given to improving water quality in these areas.
Lake Matano, one of the deepest lakes on the earth, is an important lake in Indonesia in related to to its economic, social and ecological implications. The lake has a variety of functions, including water resource for hydro-power generating, the habitat of various aquatic organisms, and water sources for domestic purposes, as an area of fishing and fish culture in floating net cages, and tourist destinations. Therefore, Lake Matano receives an amount of pollution load from these activities. This study aims to determine the public perceptions and contribution of domestic waste to water pollution of Lake Matano. This research was conducted based on a survey, in which data collection techniques were complete by direct interviews with residents using questionnaires and direct observation of the condition of the surrounding community. The results showed that public perceptions of the water pollution of Lake Matano were due to tourism and increasing settlement in the area bordering the lake (floating house). The criteria for the action of water pollution in Lake Matano through domestic waste were still in good category.
Objectives : In order to prevent eutrophication and algal blooms, Ministry of Environment in Korea reinforced the effluent standards of wastewater treatment facilities. As a result, many advanced wastewater treatment processes have been implemented nationwide. Current conventional treatment systems have usually been facing high operational costs and large sludge production problems. Therefore, it is essential to develop more economic and efficient process to cope with these issues.Methods : The sedimentation and dissolved air flotation (SeDAF) process has been developed, that integrates sedimentation and dissolved air flotation. Several simulation experiments were carried out to verify and optimize the operation conditions of the SeDAF process. Removal efficiencies of each water quality item and sludge mass balance were analyzed intensively in the SeDAF process using the modified jar-test.Results and Discussion : Removal efficiencies of the SeDAF process were higher and more stable than those of sedimentation process. Several ‘sludge production / coagulant dosage’ ratios were analyzed and the representative value of 4 mg・L-1 as SS / mg・L-1 as Al<sub>2</sub>O<sub>3</sub> was obtained in the SeDAF process. Fractions of suspended solids (SS) and total phosphorus (T-P) in sludge were measured; the ratios of flotation sludge to sedimentation sludge and fractions of flotation sludge in total sludge had their typical convergence ranges for the conditions of optimal coagulant dosage.Conclusions : The ratios or fractions of SS and T-P in sludge could be applied as the evaluation indicators of the SeDAF process. The reduction of coagulant dosage could be corresponded directly to the reduction of sludge production.
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