Acceptance Analysis of PDAM Sleman’s Water Tariff, Based on Revenue and Willingness to Pay Projection

In Sleman, the Regional Water Company (PDAM) provides clean water to the community and charges a tariff for each cubic meter of water sold to customers. According to the Minister of Home Affairs Regulation No. 71 of 2016 states, PDAM tariffs requiring an annual review in November. The most recent tariff was set by PDAM Sleman in 2016, therefore, a recalculation is required. In addition, there is a need to analyze the tariff acceptance from the service provider, and service recipient’s point of view. In this study, the calculation tariff method utilized a formula based on the Minister of Home Affairs Regulation No. 71 of 2016. Meanwhile, the acceptance analysis from profit point of view conducted by calculating the projection of water sales revenue, profit to earning assets ratio, and customer willingness to pay (WTP). Furthermore, revenue projections were obtained by multiplying tariffs with the water sold volume, while the WTP projection is obtained using the inflation method, based on the PDAM Sleman customers’ wTP, from the 2007’s research. PDAM Sleman tariffs based on calculations resulted in low tariffs of IDR3727.48, basic tariffs of IDR4659.36, and full rate of IDR9460.17. Based on the WTP analysis, the tariffs are feasible from the service recipient’s (PDAM customers) point of view, because this is affordable by customers, for the average water consumption. However, from the service provider’s (PDAM Sleman) point of view, the tariffs are not feasible a 0.31% profit ratio is much lower, compared to the 10% profit ratio. Therefore, tariff adjustments are required to increase profits. These strategies include determining tariffs based on consumption blocks alone, without breaking down based on customer group categories and adjusting the second and third consumption blocks’ rate

COMPATIBILITY OF CHARACTERISTIC OF HYDROLIC RAM PUMP AND RAIN HARVEST TECHNOLOGY WITH LOCAL CHARACTERISTICS IN ENDE REGENCY, EAST NUSA TENGGARA

A study about compatibility of characteristic of hydraulic rams (hidram) pump and rain harvest with localcharacteristics (location and society) in Ende Regency, East Nusa Tenggara, has been done. Data includingsecondary data such as characteristic of hidram pump and rain harvest, and primary data from questionnaire.The respondent are from stakeholders in Ende Regency such as public works department, regional company forwater supply (PDAM), regional agency for development planning (Bappeda), and water supply consultant. Dataanalysis was using descriptive analysis. Compatibility of technology application is seen in the aspect of needs,society empowerment, energy saving, cost, social, and cultural at Ende Regency. The study result showed thathidram pump technology compatible to be applied in Ende but needs to be studied about material standard andmodification for increasing efficiency of hidram pump. Rain harvest technology can be applied at Ende but need amodification about disinfection and filtering process before consumed

EFEKTIVITAS PENGAWETAN BAMBU PETUNG DAN GEWANG MENGGUNAKAN BORON DAN CCB SECARA RENDAMAN DINGIN DAN BOUCHERIE YANG DIMODIFIKASI

Tulisan ini mempelajari mengenai efektifitas pengawetan terhadap bambu petung dan gewang untuk meningkatkan ketahanan terhadap organisme perusak. Tujuannya untuk mengetahui tingkat keawetan yaitu ketahanan terhadap rayap tanah, rayap kayu kering, jamur pelapuk, dan kumbang bubuk kayu kering, serta keterawetan yaitu retensi dan penetrasi dari bambu petung dan gewang. Pengawetan menggunakan bahan pengawet boron dan copper-chrome-boron (CCB) serta metode pengawetan boucherie modifikasi dan perendaman dingin. Pengujian keawetan dan keterawetan dilakukan di laboratorium. Hasil pengujian menunjukkan, tingkat keterawetan bambu petung dan gewang yang diawetkan dengan boron lebih tinggi daripada saat diawetkan dengan CCB. Efektifitas pengawetan dengan menggunakan boron dan CCB serta metode boucherie modifikasi dan perendaman tidak jauh berbeda dimana dapat meningkatkan ketahanan dari kelas IV atau tidak tahan menjadi kelas I atau sangat tahan. Kelebihan pengawetan dengan boucherie modifikasi adalah cocok untuk bahan bambu yang masih segar, tidak menimbulkan bau saat proses pengawetan, serta penetrasi bahan pengawet lebih tinggi daripada perendaman. Kelebihan pengawetan dengan perendaman dingin adalah cocok untuk bahan bambu dan gewang yang kadar airnya rendah, nilai retensi lebih tinggi, memerlukan biaya rendah untuk investasi alat, dapat digunakan untuk berbagai bentuk bahan baik bambu buluh, bambu bilah, maupun batang gewang

A STUDY OF BRACKISH WATER MEMBRANE WITH ULTRAFILTRATION PRETREATMENT IN INDONESIA´S COASTAL AREA

Water pollution and sea water intrusion to water sources in coastal areas result lack of provision safe drinking water by the drinking water regional company or coastal community. The existing water treatment plant that operated on brackish surface water or groundwater feed requires improving process. Membrane process could be a choice to treat the quality of brackish water to the level of potable water that designed to lower cost with high stabil flux and longer lifetime. This research focus on application of pilot plant of brackish water treatment using Ultrafiltration (UF) membrane-air lift system as pretreatment of Reverse Osmosis (RO) membrane-low pressure. Brackish water sources contain high colloidal and suspended solids that can cause fouling load of RO membranes and impair its performance. UF pretreatment operation tested by addition of compressed air into the feed (air lift system), resulted stable flux, reduces membrane fouling and low feed pressure. A flux of RO with UF pretreatment can produce drinking water of 30--61 L/m2·hour. It was observed, the good quality of RO permeate resulted by using a pretreatment of UF--PS (Polysulfone-UF) with total dissolved solid rejection about 96--98% and color rejection about 99--100% at 5 or 8 bars of operation pressure. This paper concludes that performance of membrane technology with UF--air lift system pretreatment and RO membrane-low pressure could be accepted as condition of brackish water source in Indonesia coastal areas in producing drinking water

Aspects influence leachate characteristics on leachate treatment plants in Temesi Landfill Gianyar Regency, Bali Province, Indonesia

This paper revealed aspects that influenced leachate characteristics in leachate treatment plants located in Temesi landfill. Four aspects observed refers to Law Number 3/2013 Ministry of Public Works: landfill operation; rainfalls; treatment plant designs; operation and maintenance. Data collected by observation and field survey to identify leachate characteristics. Leachates were collected by grab sampling from inlet through outlet of the treatment plants, to be laboratory analysed to meet the standards set by Ministry of Environmental and Forestry Number 59/2016 and compared to the standards. Leachate discharge calculated using Thornthwaite method to be compared to criteria designed. The result shown that leachate discharge is 0.45 L/sec exceeding the designed discharge 0.42 L/sec. Laboratory test result from leachate sampling shown that the BOD, COD and TSS value exceeding the regulation standard in range of > 2000 mg/L. Findings revealed that the depth of maturation ponds is 2.9 meters exceeded the designed criteria. It is found that the landfill operated with open dumping system and the treatment lagoons has never been regularly drained and recirculate. Those practices increase the leachate volume and degenerate the treatment functions. It can be concluded that the 4 aspects mentioned significantly influenced the leachate characteristics