Acid coal mine drainage from the coal mining industry contains a number of heavy metal ions and dissolved  organic  substances.  An  important  step  in  wastewater  treatment  so  that  the  waste treatment process runs effectively is to know the characteristics of coal mine acidic water. This study aims to determine the characteristics of coal mine acidic water originating from former coal mine ponds by taking samples from a holding pond located in West Aceh. The method used in this research consists of field work and laboratory work. Samples of coal mine acidic  water  were  taken  from  the  former  coal  mine  pond  using grab  samples.  Furthermore, measurements of acid coal mine water parameters were measured including pH, TSS, COD, Color, Fe and Mn conducted at the integrated laboratory of Diponegoro University. Data obtained from the measurement of acid coal mine water parameters were analyzed descriptively. The measurement results include pH, TSS, COD, Color, Fe and Mn ions contained in coal mine acid water are also compared with the quality standards of liquid waste.The results showed that coal mine acid water in the former coal mine pond contained pH, TSS, COD, Color, Fe ions, and Mn with an average value of (5.5); (260mg/l); (162.82mg/l); (57mg/l); (4.7mg/l); (0.2mg/l). All parameters of coal mine acid water measurement analysis results are still above the quality standards of coal mining based on the Decree of the Minister of Environment No.113 of 2003 concerning Quality Standards for Coal Mining Liquid Waste.

The mangrove area in Tritih Cilacap, Central Java is decreasing due to illegal logging. This affects the distribution pattern of gastropods. This study aims to determine the distribution pattern of gastropods and provide information related to physical chemical factors that play a role in gastropod distribution patterns. This study was conducted at five sampling points. Five sampling points from the sea to the land. The sampling method used for gastropods was collection from 1x1 m plots. Gastropods in the plot were collected by hand on the top of the sediment and in the sediment were taken 10 cm deep using a corer with 3 repetitions for each station. Environmental parameters measured were: temperature, salinity, organic matter content, pH, and substrate type. The distribution of gastropods in Tritih Cilacap mangrove forest has a clustering and random pattern. There were 11 species of gastropods found from 7 families. Gastropod species that have clustered distribution patterns are: Ceritidhea alata, Telescopium telescopium, Neritina violacea, Neritina zigzag, Chicoreus capucinus, and Assimenia brevicula. Gastropod species that have random distribution patterns are: Ceritidhea quadrata, Neritina lineata, Cassidulla aurisfelis, Cassidulla nucleus, and Littoraria carinifera. The results of BIOENV analysis showed that the most influential environmental factors on gastropod density were water temperature, salinity, organic matter content and sand substrate.