Sidoarjo Regency is one of the supporting districts of East Java province. Sidoarjo Regency is experiencing rapid progress because of the development and potential in trade and industry. One of the industries often found in Sidoarjo Regency is tofu factory. The rapid number of tofu craftsmen industry has caused an increase in the volume of liquid waste which also flows into water bodies. The purpose of this study was to determine the reduction in BOD and COD levels for the tofu factory wastewater treatment in the Sepande area, Sidoarjo Regency using a contructed wetland with Typha latifolia as the remediator. The research stage will be carried out using a laboratory scale using acclimatization as the adaptation stage of Typha latifolia and a crontructed wetland reactor as phytoremediation processing. Based on the results and discussion, it can be concluded that there was a decrease in BOD and COD levels in the tofu industrial wastewater in Sidoarjo using the Constructed Wetland system. The percentage reduction in BOD content was greatest in soil media with 3 stems of Typha latifolia plants and a detention time of 4 days of 72%. While the largest percentage reduction in COD levels was in soil media with 2 stems of Typha latifolia plants and 4 days of detention time of 84%.
Kabupaten Sidoarjo terkenal akan hasil perikanannya yaitu sebesar 75% Kecamatan terbesar penghasil perikanan adalah Kecamatan Sedati. Salah satu sungai yang melintasi Kecamatan Sedati disebut Sungai Sedati. Sungai ini memiliki panjang sekitar 2,4 km dan lebar rata-rata 5 m. Kegiatan masyarakat di sepanjang aliran sungai diperkirakan sangat mempengaruhi kualitas air sungai. Tujuan dari penelitian ini adalah untuk mengetahui kualitas air Sungai Sedati Kabupaten Sidoarjo Jawa Timur. Penelitian ini dilakukan dengan cara melakukan pengambilan sampel air sungai. Pengambilan sampel dilakukan pada empat titik dengan memperhatikan aktifitas masyarakat di sekitar perairan sungai. Parameter yang dianalisis yaitu suhu, pH, TSS, TDS, DO dan COD. Hasil penelitian menunjukkan bahwa konsentrasi TSS, DO dan COD melampaui ambang batas baku mutu Peraturan Pemerintah Nomor 82 Tahun 2001 (Badan Air Kelas II), sedangkan konsentrasi suhu, pH dan TDS suhu memenuhi baku mutu
dengan timbulan sampah mencapai 350 ton/hari, sehingga berpotensi diolah menjadi bahan baku Refused Derived Fuel (RDF). Bahan bakar RDF berasal dari briket residu sampah yang mengandung komposisi kertas, kayu, kain, karet, dan plastik (4K1P). Briket yang dapat dijadikan sebagai bahan baku RDF adalah yang memiliki karakteristik sesuai standar SNI. Penelitian ini bertujuan untuk mengetahui prosentase komposisi penyusun briket yang berpotensi menghasilkan RDF dan kualitas standar RDF yang dihasilkan. Penelitian dilakukan dengan pengambilan sampel sampah dilakukan setiap minggu sebanyak empat kali dengan variasi waktu detensi 2,4, dan 6 jam. Metode perhitungan nilai kualitas standar RDF sesuai dengan SNI 01-6235-2000 dengan parameter yang dianalisis adalah kadar air, kadar abu, kadar volatile/uap dan nilai kalor. Hasil penelitian menunjukkan komposisi briket terbaik yang dihasilkan dari residu sampah 4K1P adalah pada sampel dengan komposisi 20% kayu, 10% kertas, 10% karet/kain dan 60% plastik Kualitas briket terbaik dengan kadar air 5,5%, kadar abu 4,9%, kadar uap 15,9% dan nilai kalor 8996 cal/gram.
Although Malaysia has abundant water resources, some parts of Malaysia are currently facing water shortage problems. The increasing demand for water has sparked initiatives to seek alternative water supplies. Rainwater harvesting has been proposed by governments as part of the solution to alleviate the problem of water scarcity. Literature related to rainwater harvesting is available from a variety of sources. In this study, rainfall was analysed as a crucial factor affecting RWHS efficiency, rainwater potential at different zones for residential, industrial, and commercial. In addition, the study evaluated the rainwater quality that obtain fresh rainfall and roof rainfall. Furthermore, potential of treatment technology for rainwater was suggested to optimate rainwater harvesting.
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