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This study aims to determine the ability of compilation of bentonite and activated carbon made from coal as adsorbents for adsorption of the parameters of the rubber industry wastewater. The test results found that the levels of BOD (Biochemical Oxygen Demand) 805 ppm, COD (Chemical Oxygen Demand) 1415 ppm, Ammonia 12.5 ppm, TSS 340 ppm, pH 6.6. The process of activation of bentonite using HCL 0.1 M. then stirred for 1 hour at a speed of 200rpm then filtered the resulting residue is heated to a temperature of 110oC for 3 hours. Activation of activated carbon is carried out using 0.2 M H3PO4 and then soaked for 24 hours, then washed with distilled water until the pH approaches neutral, dried in an oven at 150oC. The best contact time for bentonite and activated carbon compilation from coal is 0.1 gram (1: 1). With 250 ml of rubber industry, liquid waste is 60 minutes with a BOD absorption efficiency of 99.75% and COD of 98.72%. The best compilation of bentonite and activated carbon from coal in the adsorption of BOD & COD is in the compilation ratio (1: 1) with an efficiency of 99.75% BOD absorption and 98.72% COD.

Jambi River is one of the rivers located in the Muaro Jambi Temple Complex Area, Muaro Jambi Regency, Jambi Province. Muaro Jambi Temple is one of the tourist attractions in Jambi Province. This study aims to find the capacity of Jambi River tested by planned flood discharge utilizing (synthetic unit hydrograph) HSS Nakayasu method for a return period of two, five, ten, twenty-five, fifty and hundred years. HEC-RAS software used to analyse the water level in the Jambi River towards the flood potential that causes the submerging of the Kedaton Temple building. This research used the log Pearson type III method to calculate the planned rain return period and used the Nakayasu synthetic unit method to calculate the planned flood discharge. The analysis showed that the Jambi River could not load the flood discharge in the five, ten, twenty-five, fifty, and one hundred years return period at several measurement points: river sta-1, river sta-2 and river sta-5. The floodwater level did not cause the Kedaton Temple building to be flooded from the simulation result

Raw oil palm fronds (OPF-R) converted into biochar (OPF-B) by torrefaction processes at temperatures range of 200 °C to 300 °C. This study aims to evaluate OPF-B performance to reduce iron ions in artificial solutions and peat water. Batch adsorption carried out at room temperature by stirring (175 rpm) using an orbital shaker. Some parameters observed included optimum torrefaction temperature, optimum conditions of Fe ions adsorption (optimum pH and contact time) and sorption isotherm. Metal content measured using atomic absorption spectroscopy (AAS). Functional groups on material surface characterized using Fourier Transform Infrared (FT-IR). Torrefaction at 260 °C produces biochar with the highest efficiency in removing iron ions. Both functional groups C=O and C-O attributed to lignocellulose on OPF-B were diminished and absorption band of aromatic (C=C) increased which caused by torrefaction. The optimum conditions for removal of Fe ions at pH 5 and 30 minutes contact time. Adsorption process follows the Langmuir Isotherm which indicates the formation of a monolayer with qmax 111.11 mg/g. Amount of 0.025 g OPF-B able to reduce iron concentration from 13.960 mg/L to 0.746 mg/L in 100 mL peat water (has complied with Indonesian clean water standard for iron concentration).

Penelitian ini bertujuan untuk mengetahui kualitas karbon aktif yang terbuat dari cangkang buah karet sebagai adsorben untuk penjerapan logam besi (III) dalam larutan. Proses karbonisasi dilakukan pada suhu 400 oC dan 500 oC selama 1 jam dengan variasi ukuran adsorben 80 mesh dan 120 mesh. Selanjutnya dilakukan aktivasi kimia menggunakan H3PO4 10 % selama 24 jam. Hasil uji spesifikasi menunjukkan bahwa karbon aktif terbaik pada sampel karbon ukuran 120 mesh dan suhu 500 oC dengan kadar air sebesar 4,1%. Kadar abu terendah dimiliki oleh sampel 80 mesh dan suhu 500 oC sebesar 0,5%. Daya jerap terbaik dimiliki oleh sampel karbon ukuran 120 mesh dan suhu 500 oC terhadap iodin sebesar 5.681 mg/g dan daya jerap terhadap metilen biru sebesar 18,8 mg/g. Karakterisasi karbon aktif cangkang buah karet menunjukan bahwa terdapat perbedaan gugus fungsi dan kandungan senyawa yang terdapat pada karbon sebelum dan setelah di aktivasi oleh H3PO4. Untuk proses adsorpsi karbon aktif terhadap larutan logam besi (III) waktu kontak terbaik adalah 90 menit dengan massa karbon aktif 0,5 gram menunjukkan efisiensi penjerapan sebesar 68%. Model isoterm yang tepat terhadap adsorpsi pada penelitian ini adalah model isoterm Freundlich.