Kulit pisang dianggap sebagai limbah yang tidak berguna dan menimbulkan pencemaran lingkungan. Namun sebenarnya, kulit pisang dapat digunakan sebagai bahan adsorben untuk mengikat ion logam berat karena mengandung selulosa dan pektin. Penelitian ini bertujuan untuk mengetahui karakteristik adsorben yang dihasilkan terhadap jenis aktivator yaitu aktivator asam dan basa. Pembuatan adsorben menggunakan bahan kulit pisang yang sudah dikeringkan dikarbonisasi pada suhu 400°C selama 1,5 jam.  Setelah proses karbonasi, adsorben diaktivasi menggunakan aktivator basa (larutan NaOH) dan aktivator asam (larutan H2SO4) dengan konsentrasi 2 N selama 5 jam. Berdasarkan hasil penelitian, limbah kulit pisang kepok yang telah mengalami karbonasi memiliki kandungan yang terdiri dari 8,42% kadar air, 11,15% kadar abu, 24,65% kadar volatile matter, dan 55,78% kadar Fixed Carbon. Adsorben dengan aktivator basa memberikan nilai kadar air, abu, dan volatile matter yang lebih tinggi dibandingkan aktivator asam. Namun, nilai kadar fixed carbon dan daya serap adsorben terhadap iodium pada aktivator basa lebih rendah daripada aktivator asam. Pada aplikasi limbah nikel, aktivator basa memberikan nilai penurunan kadar nikel lebih tinggi daripada aktivator asam. Kata kunci : Adsorben, karakteristik, aktivator, kulit pisang kepok

Hasil samping instalasi pengolahan air limbah di industri bioetanol menghasilkan limbah padat berupa activated sludge. Limbah ini dapat menimbulkan masalah apabila tidak ditangani dengan benar. Diantaranya adalah menurunkan kandungan hara dalam tanah dan mencemari sumber air bersih bila masuk ke badan sungai. Limbah activated sludge dari proses anaerobic biodigesterdi industri bioetanol dapat dimanfaatkan sebagai pupuk organik dengan proses pengomposan. Tujuan dari penelitian ini adalah mengetahui pengaruh jenis komposter dan waktu pengomposan dalam pembuatan kompos dari activated sludge limbah industri bioetanol terhadap kandungan pupuk kompos yang dihasilkan.Pada proses pengomposan digunakan bioactivator jenis EM4. Jenis komposter yang digunakan adalah komposter aerasi dan dan komposter non-aerasi. Waktu pengomposan yang digunakan adalah blanko, minggu ke-1, minggu ke-2, minggu ke-3 dan minggu ke-4. Dari hasil analisis didapatkan karakteristik fisik pupuk kompos yaitu suhu, pH, Kelembaban, C organik, N total, P total, K total, serta ratio C/N sesuai dengan SNI  19-7030-2004. Penggunaan kompoter jenis aerasi dan non aerasi menghasilkan kualitas pupuk kompos yang memenuhi SNI  19-7030-2004. Waktu pengomposan yang semakin lama memberikan kualitas pupuk kompos yang lebih baik.Side product of the waste water treatment plant in the bioethanol industry produces solid waste in the form of activated sludge.This waste can cause problems if not handled properly. Among them are reducing the nutrient content in the soil and polluting clean water sources when they enter river bodies. Activated sludge waste from the anaerobic biodigester process in the bioethanol industry can be used as organic fertilizer by composting. The purpose of this study was to determine the effect of composter design and composting time in making compost from activated sludge of bioethanol industrial waste on the content of compost produced. In composting process used an EM4 as bioactivator. The composter design used is an aerated composter and a non-aerated composter. The composting time used is blank, week 1, week 2, week 3 and week 4. From the analysis, it was found that the physical characteristics of compost were temperature, pH, humidity, C organic, total N, total P, total K, and the C / N ratio according to SNI 19-7030-2004. The use of aerated and non aerated design composters produces quality compost that meets SNI 19-7030-2004. The longer composting time will provide better quality compost.

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Cadmium (Cd) metal is a heavy metal that can cause environmental pollution if its levels are above the environmental quality standard value. Generally, industrial wastes such as paper industry waste contain heavy metal Cd with levels reaching 0.026 ppm. Meanwhile, the quality standard for Cd metal in the environment is 0.005 ppm. For this reason, it is necessary to process it to reduce the levels of Cd metal in the waste before being discharged into the environment. One way that can be used to reduce the levels of Cd metal is by adsorption method using Cypraea moneta clamshells containing chitin. This study used variations in the particle size of the shellfish adsorbent of 6 and 12 mesh. In addition, the ratio of the amount of adsorbate and adsorbent (mg:mg) is 1 : 0.5x106; 1 : 1x106; and 1 : 1.5x106. Based on the results obtained, it showed that the use of shellfish as an adsorbent was able to reduce Cd metal content up to 89%.

Pohjentrek is one of the sub-districts of 7 sub-districts in Purworejo District, Pasuruan City. PKK is the main pengengak between the state and village women so it is very important in the government. In order to increase the PKK group building effort, it is necessary to provide skills training to be more independent so that they have a more decent job and livelihood. One of the skills that can be trained is making solid bath soap. Solid bath soap is needed in everyday life by everyone. Making this solid bath soap is relatively easy and can be made with ingredients that are not difficult to find. The purpose of this PkM is to provide technical guidance for making solid bath soap to the PKK RT.01 / RW.01 Pohjentrek Pasuruan group. Implementing training activities for making solid soap online to the PKK RT.01 / RW.01 Pohjentrek group on October 2, 2020. The publication of these activities was carried out through the Chemical Engineering Department website on October 27, 2020 and through the youtube channel of the Department of Chemical Engineering, State Polytechnic of Malang.