No abstract

PT Pos Indonesia is a state-own enterprises that is engage in the postal service. One of it activity is an article writing competition that held once in a three month. Regarding the judgement process of the contest, PT Pos Indonesia currently using manual method which is not effective to determine the rank of each article submitted. Hence, a system is needed to decide the winner of the article writing competition based on criteria that has been determined. To build this system, the author using Weighted Product (WP) in calculating the score of the winner. By using this method, it is expected to help the assessment process to determine the winner of the article writing competition become faster and more effective. From the research conducted, the results of the Weighted Product ranking processing this article assessment have the same value, if the calculation is done with a system that has been build and calculated manually, if it has the same value and weight.. From the calculations made, it can be concluded that the three winners of the article competition held by PT Pos Indonesia, with the acquisition of value,

Artikel ini bertujuan untuk mendeksripsikan sistematika penilaian autentik dalam pembelajaran daring dirumah lewat televisi saat terjadinya covid 19 sebagai alternatif pemecahan masalah dalam penilaian autententik saat ini. Penelitian ini menggunakan pendekatan kualitatif dengan latar kegiatan yaitu penilaian autentik pada siswa yang bernama Aldy Prayoga kelas 6 di SDN 3 Surya Adi kec. Mesuji. kab. OKI. Teknik pengumpulan data yang digunakan adalah observasi, wawancara, dan dokumentasi. Teknik Analisis data yang digunakan adalah reduksi data, penyajian data, dan penarikan kesimpulan. Adapun hasil penelitian ini menunjukkan bahwa (1) pembelajaran daring pada saat ini cukup membantu meskipun kurang efektif dalam proses pembelajaran, (2) sistematika pembelajaran autentik disesuaikan dengan kondisi pada saat proses pembelajaran karena penilaian ini dilakukan dengan menggunakan daring, (3) sistematika pembelajaran lewat televisi pada saat ini cukup baik meskipun lebih efektif apabila pembelajaran dilakukan di sekolah (4) kendala yang dihadapi saat belajar daring dirumah adalah mati lampu, memerlukan paket data internet dan pembelajaran lebih sulit.

Methylene blue is one of the dyes in textile industries which has a negative impact on the environment. This compound is very stable, so it is difficult to degrade naturally. Methylene blue can be harmful to the environment if it is in a very large concentration, because it can increase the value of Chemical Oxygen Demand (COD) which can damage the balance of environment ecosystem. Adsorption method by using activated carbon as the adsorbent is one of the most efficient and effective techniques in dye removal due to its large adsorption capacity. However, the adsorption method using activated carbon only removes the pollutant compounds to other media or phases. Other method that can be used includes Advanced Oxidation Processes (AOPs). This method has the advantage of being able to degrade harmful compounds in the waste through oxidation (oxidative degradation) processes. One method of AOPs is the process by using Fenton reagents. This study was aimed to prepare and characterize iron oxide/porous activated carbon catalyst. The type of porous activated carbon used was carbon from biomass derived carbon with microporous character. This biomass carbon is obtained from renewable natural products, namely coconut shell.The kinetics and adsorption models in the material will be derived and evaluated from the research data. Based on the research, it can be concluded that catalytic degradation is very effective for degradation of dye wastewater. Methylene blue degradation increases with the use of Fe2O3/activated carbon catalyst and the addition of hydrogen peroxide as the Fenton reagent. In addition, the pore structure difference in the catalyst also had a significant effect on the methylene blue degradation reaction resulting in increased capacity of methylene blue degradation reactions.

The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is very stable and is difficult to decompose naturally leading to environment in large concentrations. Therefore, a waste treatment technology to reduce the concentration of dye waste in water becomes importannt. So far, adsorption method with activated carbon remains the most efficient and effective technique in removing dyes from liquid waste due to its relatively large adsorption capacity. Activated carbon is one of the non-metallic mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of activated carbon in adsorbing methylene blue with variations in the concentration of methylene blue and particle size of activated carbon. The procedures in this experiment include, the preparation of activated carbon with size variations (20-60, 60-100 and> 100 mesh) and variations in the concentration of methylene blue (15 ppm, 30 ppm and 45 ppm) with contact time (0 to 180 minutes). From the results of the study, it was found that the smaller the size of activated carbon used, the greater the adsorption capacity, ie at mesh size> 100 mesh, the adsorption capacity was 9.8%. Whereas, the smaller the concentration of methylene blue, the activated carbon could work optimally at a concentration of 15 ppm at 30 minutes with adsorption capacity as high as 100%.Keywords: adsorption; Methylene Blue; activated carbon; concentration; time; particle size

Textile industry waste contains dyes that are difficult to decompose naturally and cause disruption of ecosystems in water. The colorant that is often used in the textile industry is methylene blue which is a cationic heterocyclic aromatic compound. This compound is so stable that it is difficult to decompose naturally and is harmful to the environment in large concentrations. Therefore, we need a waste treatment technology that can reduce the concentration of dye waste in water. So far, the adsorption method remains the most efficient and effective technique in removing dyes because of its relatively large adsorption capacity. One method that can be used is the adsorption method using natural zeolite. Zeolite is one of the non-metal mineral commodities or multipurpose industrial minerals, one of which is as an adsorbent or adsorbent media. This study aims to determine the potential of natural zeolite in absorbing methylene blue with variations in the concentration of methylene blue and various sizes of natural zeolite mesh. The procedures in this experiment include, the preparation of natural zeolite with size variations of 20-60 mesh, 60-100 mesh and> 100 mesh and variations in the concentration of methylene blue used 15 ppm, 30 ppm and 45 ppm with contact time from 0 to 180 minutes. From the results of the study it was found that the smaller the size of natural zeolite used, the greater the percentage of dye removal that is at mesh size> 100 mesh the percentage of dye removal was 32.11%. As for the variation of the concentration of methylene blue, the smaller the concentration, the natural zeolite can work optimally ie at a concentration of 15 ppm at 180 minutes the remaining methylene blue concentration of 0.145 ppm.

Sampah organik merupakan sampah yang mengandung kadar air tinggi dan mudak busuk. Peunumpukan sampah organik dapat mencemari lingkungan dan menjadi wabah penyakit. Salah satu cara untuk mengolah sampah organik adalah pembuatan pupuk kompos. Kegiatan sosialisasi dan pelatihan pembuatan kompos dilaksanakan di ranting Muhammadiyah Tirtonirmolo, Kasihan, Yogyakarta. Tujuan kegiatan ini adalah meningkatkan pengetahuan dan ketrampilan bagi anggota ranting Muhammadiyah Tirtonirmolo dalam pengolahan sampah organik. Kegiatan diawali dengan pemaparan melalui sosialisasi materi tentang sampah organik dan pupuk kompos secara umum kemudian dilanjutkan dengan pelatihan praktek pembuatan pupuk kompos dari sampah organik. Proses pembuatan kompos dilakukan dalam komposter 20 L menggunakan bioaktivator EM-4. Hasil yang diperoleh dari kegiatan pengabdian masyarakat ini adalah peserta dapat memahami teknik pengolahan sampah organik menjadi pupuk kompos dengan baik yang ditunjukkan dengan persentase capaian ≥ 80%.

Perkembangan populasi masyarakat Indonesia sedemikian pesat sehingga menimbulkan berbagai dampak baik positif maupun negative. Salah satu dampak negative yang ditimbulkan akibat pertumbuhan penduduk adalah sampah. Setiap rumah tangga menghasilkan sampah yang tidak sedikit jumlahnya. Beban pengelolaan sampah saat ini tergantung pada Tempat Pembuangan Akhir (TPA) di masing-masing daerah. Sehingga hal ini menimbulkan dampak sosial dan lingkungan yang cukup serius. Masalah sampah tidak hanya terdapat di wilayah perkotaan namun telah sampai pada wilayah pedesaan. Masyarakat pedesaan biasanya membuang sampah langsung ke sungai atau membakarnya di kebun mereka. Pola kebiasaan tersebut dapat menimbulkan pencemaran udara maupun lingkungan perairan. Oleh karena itu, pengabdian ini bertujuan untuk mengedukasi masyarakat agar dapat memilah sampah menurut jenisnya sehingga tahap selanjutnya sampah tersebut lebih mudah untuk diolah menjadi barang yang bernilai jual. Berdasarkan jenisnya sampah dibagi menjadi 2, yaitu sampah anorganik dan sampah organik. Sampah anorganik yang dihasilkan dalam rumah tangga antara lain, botol, plastik kemasan makanan maupun minuman. Sedangkan sampah organik yang dihasilkan rumah tangga seperti, sisa sayur, sisa buah maupun sisa makanan. Dalam pengabdian ini masyarakat diberikan penyuluhan dan pelatihan mengenai cara memilah dan mengolah sampah anorganik maupun organik. Sampah anorganik dioleh menjadi ecobrick sedangkan sampah organik diolah menjadi pupuk cair. Hasil pengabdian ini adalah dapat menambah wawasan dan merubah pola penanganan sampah di masyarakat agar lebih peduli terhadap kelestarian lingkungan. Selain itu teknologi sederhana dan ramah lingkungan sehingga masyarakat dapat mengaplikasikan langsung untuk mengolah sampah rumah tangganya secara mandiri.   Â