A study of water balance in the Upper Konto sub-watershed was carried out to determine the potential for water availability and its use in the multisector water needs. Rainfall was converted into discharge using the F. J. Mock method, compared with the observed discharge, and calibrated with the Relative Error, Root-Mean-Square Error (RMSE), Nash-Sutcliffe Efficiency (NSE), and Correlation Coefficient (R). The potential for water availability was calculated based on an 80% dependable flow using the Weibull probability method with an amount of 22.41 m3/sec, equivalent to 706.622 million m3/year. The amount of water demand within a period of 25 years in scenario 1 (calculated based on data and increasing according to the growth rate) is 95.090 million m3/year, while in scenario 2 (based on the assumption that domestic, non-domestic, and industry demand increased while fishery, agriculture, and livestock demand remained constant) is 93.419 million m3/year. The results of the water balance analysis showed that the potential for water availability is sufficient for all multisector water needs, or indicates a surplus condition for 25 years (2017-2042).

ABSTRAK: Desa Argosari merupakan salah satu desa yang memiliki peternakan sapi di Kabupaten Malang. Penelitian ini dilakukan di salah satu rumah di Desa Argosari dan memiliki 6 (enam) ekor sapi. Dalam satu hari tiap ekor sapi menghasilkan limbah cair sebesar 100-150 liter. Namun, limbah cair tersebut langsung dibuang ke saluran drainase karena belum adanya usaha dalam pengolahan limbah cair. Pada hasil uji laboratorium sampel air limbah, kandungan BOD, COD, TSS, NH3-N dan pH pada influent limbah cair sapi masingmasing sebesar 4488 mg/L, 11000 mg/L, 850,5 mg/L, 479,3 mg/L, 8,5 mg/L. Berdasarkan Peraturan Menteri Negara Lingkungan Hidup Nomor 11 Tahun 2009, kandungan limbah cair tersebut belum memenuhi standar baku mutu. Sehingga dibutuhkan Instalasi Pengolahan Air Limbah (IPAL) untuk dapat mengurangi kandungan pada limbah cair sapi. Instalasi yang sesuai pada kondisi tersebut adalah bak pengendap awal, bak biofilter aerob dan bak pengendap akhir. Biofilter aerob digunakan agar kandungan limbah cair dapat terurai secara biologis dengan menggunakan media biofilter sarang tawon untuk tempat tumbuh dan berkembangbiaknya mikroorganisme. Setelah adanya proses pengolahan IPAL, terjadi penurunan pada effluent, sehingga IPAL menghasilkan effluent BOD sebesar 80,78 mg/L, COD = 198 mg/L, TSS = 5,10 mg/L, NH3-N = 23,9 mg/L dan pH = 8,5.Kata kunci: limbah cair sapi, bak biofilter aerob sarang tawon, IPAL ABSTRACT: Argosari Village is one of the villages that has cattle farms in MalangRegency. This research was conducted in one of the houses in Argosari Village and has 6 (six) of cows. In one day, each cow produces 100-150 liters of liquid waste. However, the liquid waste is immediately discharged into the drainage channel because there is no effort to process wastewater. On the results of laboratory tests, samples of wastewater, BOD, COD, TSS, NH3-N and pH in wastewater were respectively 4488 mg/L, 11000 mg/L, 850,5 mg/L, 479,3 mg/L, 8,5 mg/L. Based on the Regulation of the Minister of Environment Number 11 of 2009, the liquid waste has not met the quality standard. Wastewater Treatment Plant (WWTP) is needed to save reserves on cattle wastewater. The suitable installation in this condition is an initial settling basin, aerobic biofilter basin and a final settling basin. Aerobic biofilter is used so that liquid waste can be used biologically by using the media of honeycomb biofilter to grow and breed microorganisms. After processing the WWTP, there is a decrease in effluent, so WWTP can produce effluent BOD of 80,78 mg/L, COD = 198 mg/L, TSS = 5,10 mg/L,9 mg/L and pH = 8,5.

Liquid waste generated from cattle farms is discharged directly into culvert and river. The liquid waste is not treated so it has high potential to threaten and pollute the water and ground water environment. With the average flushing done twice a day, the gross amount of wastewater that is wasted is not less than 100-150 liters/day/cattle for weight 400 kg (Saputro et al. 2014). Therefore a wastewater treatment plant (WWTP) is needed to control the massive liquid waste. In addition, WWTP must be simple, inexpensive, and appropriate so that the community can apply it. Data collection is needed, namely data on the number of cattle livestock, waste water quality data and waste water discharge data. The organic parameters of cattle waste that are considered are BOD, COD, TSS, NH3-N, and pH only (Regulation of the State Minister for the Environment Number 11 Year 2009 concerning Wastewater Quality Standards for Cattle and Pork Businesses and/or Activities). Design for wastewater treatment plants (WWTP) model using the MSL (Multi Soil Layering) method (Alternative 1) and the combination of MSL with anaerobic wasps nest biofilter (Alternative 2) (Said et al. 2001). Compare the effluent results in the both alternatives that available the quality standards and analyze more optimally.

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