Modeling Surface Water Quality of UI Recharge Pond using Numerical Method

During the last decade, water scarcity in terms of quantity and quality degradation has become a major issue in Indonesia. In 2006, Universitas Indonesia (UI) supported by the Ministry of Public Works built a recharge pond as a field model to overcome flood and drought in Jakarta and its surroundings. However, since then, a lack of research has been conducted to monitor and analyze the rate of change in water quality in the UI recharge pond. The purposes of this study are to identify the characteristics of UI recharge pond and evaluate the surface water quality changes. Water samples were taken from the pond and analyzed in the laboratory for water quality tests. The evaluation method used for simulation of water quality was a numerical model using Runge-Katta Order 4. Laboratory analysis results show concentrations of Mn, Fe, BOD and COD are exceeding the water quality standards (GR No.82/2001). The water purification process in the pond was found to be faster in response to BOD (?= 0.5 d-1) and for Mn, Fe, and COD are found to have similar results at ?= 0.4 d-1. The 95% response time of the pond was found to be longer for Mn, Fe, and COD (t95 = 7.5 d) and the faster rate is BOD (t95 = 6.0 d). The result of numerical modeling demonstrates Mn concentration in the pond will be doubled (0.45 mg/L) on the day-15th and asymptotically converges on a steady state. The Fe, BOD, and COD reaches the steady state concentration around on the day-11th (0.95 mg/L), on the day-13th (56.6 mg/L), and on the day-17th (224 mg/L), respectively.

Numerical model, Simulation and observation, UI recharge pond, Water quality changes, Water quality modeling

Abdur, R., Budi, H., 2004. Penyaringan Air Tanah dengan Zeolit Alami untuk Menurunkan Kadar Besi dan Mangan. Makara. Kesehatan, Volume 8(1), pp. 1-6.

Anonymous, 2001. Peraturan Pemerintah Republik Indonesia Nomor 82 Tahun 2001 Tentang Pengelolaan Kualitas Air dan Pengendalian Pencemaran Air.

Ballantyne, F., Menge, D.N.L., Weitz, J.S., 2010. A Discrepancy between Predictions of Saturating Nutrient Uptake Models and Nitrogen-to-Phosphorus Stoichiometry in the Surface Ocean. American Society of Limnology and Oceanography. Volume 55(3), pp. 997–1008.

Blomqvist, P., 2001. A Proposed Standard Method for Composite Sampling of Water Chemistry and Plankton in Small Lakes. Environmental and Ecological Statistic, Volume 8, pp.121–134.

Boyd, C.E., 1988. Water Quality in Warmwater Fish Pond. Fourth Printing. Auburn University Agricultural Experiment Station. Alabama, USA. 359 pages.

Chapra, S., 1997. Surface Water Quality Modelling. McGraw-Hill.

Effendi, H., 2012. Telaah Kualitas Air bagi Pengelolaan Sumber Daya dan Lingkungan Perairan. Cetakan Ketujuh. Kanisius, Yogyakarta. 258 pages.

Hartono, D.M., Novita, E., Gusniani, I., Oriza, I.I.D., 2010. The Role of Water Supply and Sanitation during Floods: Case Study of Flood Disaster in Five Regions of Jakarta. International Journal of Technology, Volume I(1), pp. 29–37.

Joko, S., 2011. Pengaruh Pengisian Air Tanah Buatan melalui Waduk Resapan Terhadap Kualitas Air Tanah Dangkal. Studi Kasus Waduk Resapan di Kampus Universitas Indonesia – Depok. Fakultas Teknik, Universitas Indonesia.

Legowo, S., Sudinda, T.W., 2009. Kajian dan Penerapan Teknologi Waduk Resapan (WR) untuk Mengatasi Banjir dan Kekeringan. Prosiding Workshop Teknologi Imbuhan Buatan untuk Mengatasi Banjir dan Kekeringan, Deputi Bidang Pendayagunaan dan Pemasyarakatan Iptek, Kementrian Negara Riset dan Teknologi, pp.110-121.

McNeely, R.N., Nelmanis, V.P., Dwyer, L., 1979. Water Quality Source Book. A Guide to Water Quality Parameter. Inland Waters Directorate, Water Quality Branch. Ottawa. Canada.

Palupi, K., Sumengen, S., Inswiasri, S., Agustina, L., Nunik, S.A., Sunarya, W., Quraisyn, A., 1995. River Water Wuality Study in the Vicinity of Jakarta. Water Science and Technology, Volume 31(9), pp. 17-25.

SNI 13-03-S1, 2012. Daftar Standar Nasional Indonesia - Kualitas Air.

Sutjinigsih, D., Anggraheni, E., 2011. Effectiveness of Stormwater Ponds as Water Quality Management System Elements. Case Study: Situ KAMPUS-UI System, Depok, West Java, Indonesia. Proceeding of the 12th International Conference on QiR (Quality in Research). Bali, Indonesia, 4-7 July 2011.

Sutopo, P.N., 2008. Analisis Kualitas Air Danau Kaskade Sebagai Sumber Imbuhan Waduk Resapan di Kampus UI Depok. Jurnal Sains dan Teknologi Indonesia, Volume 10(2), pp. 99-105

Suwartha, N., Pramadin, R.A., 2012. Evalutation of Universitas Indonesia’s Recharge Pond Performance and Potential Utilization for Raw Water Source. MAKARA Journal of Technology Series, Volume 16(1), pp.1–6.

UNEP, 1996. Water Quality Monitoring. A Practical Guide to the Design and Implementation of Freshwater Quality Studies and Monitoring Programmes. E&FN Spon, an Imprint of Chapman & Hall, 2-6 Boundary Row, London SE1 8HN, UK.

UNESCO, 2005. Water Resources Systems Planning and Management, An Introduction to Methods, Models, and Applications. UNESCO Publishing, Delft Hydraulics, The Netherlands. 399 pages.