Penggunaan kembali material limbah dengan cara mendaur ulang merupakan salah satu cara efektif untuk menghindari pencemaran lingkungan dan mengurangi volume timbulannya di Tempat Pembuangan Akhir. Penelitian ini dilakukan untuk mengetahui potensi ekonomi kegiatan daur ulang sampah plastik oleh sektor informal di Kecamatan Purwodadi. Penelitian dilakukan melalui survei menggunakan kuesioner terhadap 29 pelaku daur ulang. Hasil penelitian menunjukkan bahwa potensi ekonomi yang terdapat dalam usaha daur ulang sampah plastik pada tiap tingkatan pelaku daur ulang berbeda-beda. Berdasarkan analisis kelayakan ekonomi menggunakan nilai Net Present Value (NPV), Benefit Cost Ratio (BCR), dan Internal Rate of Return (IRR) dapat disimpulkan bahwa usaha daur ulang tingkat penggiling layak secara ekonomi dengan nilai NPV Rp 923.395.260 (NPV > 1), nilai BCR 1,58 (BCR > 1), dan nilai IRR 56,82. Benefit (manfaat) dari implementasi program 3R sampah plastik pada sektor informal secara umum dapat digolongkan menjadi dua manfaat, yaitu manfaat langsung (direct benefit) dan manfaat tidak langsung (indirect benefit). Manfaat langsung (direct benefit) berupa keuntungan penjualan sampah plastik. Keuntungan bersih tiap jenis sampah plastik pada tingkat pemulung antara Rp 500-Rp 2.600, tingkat bank sampah berkisar antara Rp 100-Rp 400, tingkat pengepul I berkisar antara Rp 91,67-Rp 391,67, tingkat pengepul II berkisar antara Rp 173,46-Rp 473,46, tingkat bandar berkisar antara Rp 186,94-Rp 686,94, dan tingkat penggiling berkisar antara Rp 136,23-Rp 1.136,32. Manfaat tidak langsung (indirect benefit) adanya pengelolaan sampah plastik oleh sektor informal yaitu tereduksinya sampah plastik di Kecamatan Purwodadi sebesar 10,08%.
Abstract. Air emissions related to the transportation sector has been identified as the second largest emitter of ambient air quality in Indonesia. This is due to large numbers of private vehicles commuting within the city as well as inter-city. A questionnaire survey was conducted in Semarang city involving 711 private vehicles consisting of cars and motorcycles. The survey was conducted in random parking lots across the Semarang districts and in vehicle workshops. Based on the parking lot survey, the average distance private cars travelled in kilometers (VKT) was 17,737 km/year. The machine start-up number of cars during weekdays; weekends were on average 5.19 and 3.79 respectively. For motorcycles the average of kilometers travelled was 27,092 km/year. The machine start-up number of motorcycles during weekdays and weekends were on average 5.84 and 3.98, respectively. The vehicle workshop survey showed the average kilometers travelled to be 9,510 km/year for motorcycles, while for private cars the average kilometers travelled was 21,347 km/year. Odometer readings for private cars showed a maximum of 3,046,509 km and a minimum of 700 km. Meanwhile, for motorcycles, odometer readings showed a maximum of 973,164 km and a minimum of roughly 54.24 km. Air pollutant emissions on East-West routes were generally higher than those on South-North routes. Motorcycles contribute significantly to urban air pollution, more so than cars. In this study, traffic congestion and traffic volume contributed much more to air pollution than the impact of fluctuating terrain.
Municipal solid waste (MSW) is an energy resource with sufficient energy/calorific value, making it a suitable substitute for fuel. This study investigated the effect of air flow rate on the MSW calorific value, the hemicellulose content, and the MSW degradation rate in a biodrying process. Four biodrying reactors equipped with flowrate and temperature recorders were used in the study. The air flow rate was varied as follows: 0 L/min/kg, 2 L/min/kg, 4 L/min/kg, and 6 L/min/kg, corresponding to reactors R1, R2, R3, and R4, respectively. The calorific value, water content, hemicellulose content, organic C content, and total N were measured on day 1, day 15, and day 30. The results showed that the biodrying process could increase the calorific value by 55.3 %, whereas the control reactor could increase the calorific value by only 4.7 %. The highest calorific value was 17.63 MJ/kg, at an air flow rate of 4 L/min/kg. The air flow rate had a significant effect on increasing the calorific value (sig.<0.05). The highest temperature in the biodrying process was 41 °C. The final MSW moisture content was 27.28 %, resulting from R4. According to the statistical test results, the air flow rate had a significant influence on the water content parameters. Hemicellulose degradation due to air flow rate reached 80–85 %. The air flow rate did not significantly influence the hemicellulose degradation (sig.>0.05). The biodrying process is the suitable method to increase the calorific value of MSW while reducing its water content; thus, the process promotes the realization of waste to energy as refuse-derived fuel.
Potential problems in household waste management are still found, especially in residential areas. Pucung Village, Tirto District Pekalongan Regency with a population of 3.347 people, is one example of a village that has not implemented waste management properly. The availability of inadequate trash can be one of the factors that causes the waste has not been well managed in this village. This community assistance activity aims to educate and encourage the community to be self-sufficient in waste management, especially in waste sorting. According to the recommendations of Pucung Village Government, this community assistance activity is centered in RT 04 RW 01 area as an embryo or pilot project to be implemented in all Pucung Village area. The methods used are survey, socialization, simulation, and post-socialization follow-up. The residents are quite enthusiastic and appreciative towards this activity, shown by the attendance rate of more than 60% during socialization and conducive discussion. The results of post-socialization evaluation indicate that people have started to realize in managing waste, indicated by the separated garbage in a different trash can at their residenceKeywords: accompaniment, sorting, waste, Pucung
Bank sampah di Kelurahan Palabuhanratu sudah berdiri sejak tahun 2010. Bank sampah ini adalah salah satu bank sampah diantara dua bank sampah lain, yang baru berdiri pada tahun 2016. Volume sampah pada tahun 2015 sebesar 134,89 m3 per hari, mencakup 89% wilayah Kelurahan Palabuhanratu ternyata masih belum optimal dalam pengolahannya, karena sampah yang direduksi masih sekitar 5% dari total timbulan sampah yang dikirim ke TPA Cimenteng yang berlokasi sekitar 70 km dari Kelurahan Palabuhanratu. Kinerja bank sampah eksisting masih kurang, karena satu bank sampah hanya mampu melayani satu RW dan belum dapat melayani satu kelurahan. Selain itu, pengolahan sampah organik untuk dijadikan kompos belum dilakukan secara serentak oleh seluruh masyarakat, karena pengetahuan masyarakat yang masih kurang. Tujuan penelitian adalah mengetahui kondisi eksisting pengelolaan sampah dan merumuskan upaya revitalisasi Bank Sampah eksisting sebagai pihak pendukung pengelolaan sampah di TPS Kelurahan Palabuhanratu. Metode penelitian menggunakan metode survei, dengan menggunakan kuesioner, wawancara mendalam, dan observasi. Teknik analisis menggunakan analisis kuantitatif dan analisis kualitatif. Hasil penelitian menunjukkan bahwa masyarakat yang melakukan pemilahan sampah dari sumber hanya penduduk RT 01 RW 33. Selain itu jumlah TPS di Kelurahan Palabuhanratu masih terbatas, sehingga membutuhkan tambahan 5 unit TPS yang terintegrasi dengan bank sampah di kelurahan ini.Kata kunci: revitalisasi, bank sampah, PalabuhanratuThe waste bank in Palabuhanratu Village has been established since 2010. This waste bank is one of the waste bank among two other waste banks, newly established in 2016. The volume of waste in 2015 is 134,89 m3 per day, covering 89% of Palabuhanratu Village area is still not optimal in its processing, because the reduced waste is still about 5% of the total waste generation delivered to the Cimenteng Final Diposal Site (FDS), which located about 70 km from Palabuhanratu Village. The existing waste bank’s performance is still very poor, because one waste bank can only serve one RW and can not serve the entire village. In addition, the processing of organic waste to be compost has not been done simultaneously by the whole community, due to the lack of people's knowledge. The purpose of this research is to know the existing condition of waste management and to formulate the revitalization of existing waste bank. The research used survey research method by using questionaire, in depth interview, and observation. Analytical technique using quantitative and qualitative analysis. The findings shows that the residents of Palabuhanratu Village who often do waste sorting from the source only from the residents of RT 01 RW 33. In addition, the number of existing temporary disposal site (TDS) in Palabuhanratu Village is still lacking, so it requires addition up to 5 units that integrated with waste bank in this village.Keywords: revitalization; waste bank, Palabuhanratu
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