STUDI PEMODELAN SPESIASI KADMIUM DI SUNGAI WINONGO MENGGUNAKAN VISUAL MINTEQ DAN WASP7.3 CADMIUM SPECIATION MODELING IN WINONGO RIVER USING VISUAL MINTEQ AND WASP7.3

• Main Authors: , OCHIH SAZIATI, , Dr. Eko Sugiharto, DEA
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2014
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/127866/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=68173
• Institution: Universitas Gadjah Mada

Modeling of Cd in Winongo River using Visual MINTEQ has been conducted to determine the speciation of Cd in various pH. The effects of load from point sources, dispersion coefficient (Ex), river flow and distribution coefficient (Kd) to the changes of Cd concentration in Winongo River were also studied using WASP7.3. Winongo River, was divided into four segments with the length range of 1.7-9.3 km. The data required for this study were obtained from literatures and related agencies. Variables used in this study were pH (6.72-7.59), load from point sources (without the disposal of waste, with the disposal of waste, increased to 25, 50, 75 and 100%), Ex (0.8, 21.5 and 36.4 m2/day), river flow (average monthly flow of 2 years (2007 and 2011), 3 years (2010-2012) and average annual flow of 2 years (2007 and 2011) and 3 years (2010-2012)) and Kd (630.96, 79,432.82 and 1,995,262.32 L/kg). Visual MINTEQ and WASP7.3 can be applied to simulate Cd in Winongo River. The analysis result using Visual MINTEQ showed that the dominant species of Cd formed in Winongo river was Cd(HS)2. Other species such as CdHS+, Cd2+, CdCl+ and CdSO4 were also formed. The increasing of the river pH would increased the concentration of Cd(HS)2, while the concentrations of other species decreased. The modeling results using WASP7.3 showed that load from point sources, dispersion coefficient (Ex), river flow and distribution coefficient (Kd) affected the changes of Cd concentration in Winongo River. The increase of load from point source on conditions the concentration of Cd in the waste is 0.01 mg/L (Goverment Decree DIY No.7/2010) and flow is 15 m3/day, show that the concentration of Cd(HS)2 in Winongo River did not exceed water quality standard.