HYDRODYNAMIC RELATION OF RIVER-GROUNDWATER AND DISTRIBUTION PATTERN OF POLLUTANT: TSS, FE, CU, COD, BOD, AND E. COLI

• Main Author: YENI , DEFITRI
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/15322
• Institution: Institut Teknologi Bandung

Cisadane River flows from Mt. Salak northward to Java Sea, passes Bogor and Tangerang. Previous researches in 2003-2005 stated that Cisadane water quality has been degraded. The objectives of this study are to identify the hydrodynamics relationship between river and aquifer and to map the contamination pattern of TSS, Fe, Cu, COD, BOD, and E. coli. Three hydrodynamic models are found based on unconfined groundwater flow analysis: 1) Effluent model at Segment I (Kranggan-Batuceper) with ?h/?l of 0.2- 0.25; 2)Perched model at Segment II (Batuceper-Kalibaru) with ?h/?l of 0.2-0.25; 3)Influent model at Segment III (Kalibaru-Tanjungburung) with ?h/?l of 0.15- 0.20. Such small gradients are controlled by flat topography. Major element analysis of groundwater reveals 3 facies: calcium-bicarbonate, calcium-magnesium-bicarbonate, and sodium-potassium-bicarbonate. Bicarbonate domination (60.6 meq/l) indicates reaction between water with air in the aquifer. Calcium and magnesium contents (4.9 meq/l and 0.8 meq/l max) come from calcite and dolomite of Bojongmanik Fm and volcanic material in alluvium layers. Sodium and potassium (1.228 meq/l and 0.205 meq/l) probably come from enrichment of volcanic material in Banten Tuff and alluvium sediments. Water quality parameters of TSS, Fe2+, Cu+, COD, BOD, and E. coli, are lower than permitted limit. Average TSS of 73.38 mg/l probably comes from sand mining activities at Kranggan area in addition to natural erosion. Average Fe2+ of 0.61 mg/l and Cu+ of 0.13 mg/l probably originates partially from small electroplating industries at Kranggan. Average BOD of 8.42 mg/l, COD of 25.75 mg/l, and E. coli of 6275/100 ml come from domestic activities along river banks. Pollution pattern which is higher towards downstream needs special awareness. Small industries must be introduced to cheap waste reduction method, while sand mines must have settlement ponds. Organic pollution due to domestic actions, requires sociological approaches. Aside to that, aeration process, ultra filtration, and reverse osmosis can be applied to reduce organic content, although most of them are still expensive.