Liquid waste with a high amount of total suspended solids (TSS) is one of the significant environmental issues from coal mining activities in Kalimantan island under high precipitation in of an extensive zone of cover...
Liquid waste with a high amount of total suspended solids (TSS) is one of the significant environmental issues from coal mining activities in Kalimantan island under high precipitation in of an extensive zone of coverage. The TSS concentration with Nano-sized particle in mine drainage is caused by clay minerals which are dominated by montmorillonite type. Therefore, a vast chemical agent is usually used to treat TSS concentrations of liquid waste less than 300 mg/L based on government regulation. However, in this case, the chemical flocculant triggers the onset of secondary pollutant because of carcinogenic and non-biodegradable conditions. This study aims to observe specific fungi, Marasmius sp, as bio-flocculant for the treatment of mine drainage with extra high TSS. The fungi can produce a biodegradable polymer that precipitate the montmorillonite with two-mode action, namely bio-flocculant polymerization and mycelial trapping. A role model was performed in a laboratory-scale less than 1 L in several graduated/measuring cylinders under 22-30 °C. The results of clarity and flocculation rate tests indicated that the minerals in the mine drainage samples from *** mining excavation area, had been precipitated rapidly. The clarity test by using spectrophotometer indicated that eighty six percent (86%) clarity value averagely in one-hour treatment, while the TSS concentration amount decreased down to 110.1 mg/L from original measured at 11,000 mg/L based on the flocculation rate test.
Indonesian river's potentials on Mini or Microhydro fuelled power plants has not been maximally explored despite its big potentials of utilization. The 500 MW energy potentials of Mini or Microhydro throughout Ind...
Indonesian river's potentials on Mini or Microhydro fuelled power plants has not been maximally explored despite its big potentials of utilization. The 500 MW energy potentials of Mini or Microhydro throughout Indonesia have only reached the point of 4.5% while National Energy Management Blueprint in 2050 targeted 31% of renewable energy (RE) is coming from Micro hydro energy. The applications of 80 mm diameter cross flow turbine in a household scale have drawn an increase in its experience with 450 Watts of power produced through small discharge of 20 liters/second and 3-meter head. Cross flow turbines testing in 130 mm length and 80 mm diameter conducted using Mini / micro hydropower Plant in environmentally friendly power House drum. Lower investment and operational design cost also to be made on its aim to reach community group or individual segments.
The economic growth of a country will be greatly influenced by road and bridge infrastructure that serves as a connecting flow of goods and human transportation. There are still some road and bridge construction proje...
The economic growth of a country will be greatly influenced by road and bridge infrastructure that serves as a connecting flow of goods and human transportation. There are still some road and bridge construction projects in Indonesia that show the occurrence of accidents because lack of awareness by the management of the adverse effects of safety. Therefore, the author tries to find solutions to the improvement measures in minimizing the occurrence of occupational accidents by providing safety knowledge to the Project Managers and related staff, to be more concerned about the safety and the environment around the project. Based on data collected from the Ministry of Public Works and Indonesian People's Housing, there are several work accidents in toll road projects in Indonesia from August 2017 to February 2018. When viewed from several of these accidents, it can be concluded that the main cause is the lack of knowledge of the management staff about the need to enforce safety regulations, especially in the work of lifting object to the upper structure. Therefore, a commitment is needed to implement serious occupational safety regulations from all stakeholders who play a role in developing this infrastructure project.
Urban parks provide vital social, environmental and health benefits to residents. However, the spatial distribution of parks, and the amenities they provide, may not be equitably distributed within cities. We examine ...
Urban parks provide vital social, environmental and health benefits to residents. However, the spatial distribution of parks, and the amenities they provide, may not be equitably distributed within cities. We examine the accessibility of urban parks with different social, environmental and health amenities by race and ethnicity. We identified 122,988 urban parks across the USA, measured the racial/ethnic population distribution within a 10-min walkshed around each park and compared these distributions to the overall demographics of the city. We found that the spatial distribution of parks as well as park amenities differ according to the neighborhood demographics. Racial/ethnic compositions of neighborhoods surrounding parks tend to be whiter than other parts of the same cities, though there are regional differences. Parks in predominantly white neighborhoods are cooler in the summer and have more tree cover compared with parks in neighborhoods with greater proportions of Hispanic and Black residents. Differences in amenities hold across regions of the country. Our study demonstrates that inequities in access to high-quality parks are widespread across the USA.
The delay in construction projects undertaken by contractors is impeding the economic growth of a region. Medan city which is one of the big cities in Indonesia is suffering from it. This study aims to identify the do...
The delay in construction projects undertaken by contractors is impeding the economic growth of a region. Medan city which is one of the big cities in Indonesia is suffering from it. This study aims to identify the dominant factors causing delays in construction projects conducted by private contractors. The interview method with questionnaires is used to involve 20 contractors, 10 consultants, and 10 owner representatives in the study. From the 45 identified factors causing delays, the highest ranking is the change of work demand by the project owners with 71.84% importance index.
At the Unit Laka Lantas Polres Lhokseumawe determining accident-prone areas on roads in Lhokseumawe still using manual systems. Determination of accident-prone areas are less effective because the police Unit Laka Lan...
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