Judul: Printing Wastewater Treatment by Alum and FeCl3 Coagulants Additions also Adsorptions by Zeolite.
Abstrak: Wastewater mold plate cleaning of IPB printing has high chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solid (TSS), zinc (Zn), and pH values and do not meet with standard of safe quality wastewater criteria for environments and need to the treated. The simplest method for wastewater treatments is by coagulants addition and its adsorption with zeolite. This research was to compare alum and FeCl3 coagulant optimum conditions through coagulant concentrations and coagulation pH variation, analysis sludge product of coagulation, and observe the effect of zeolite additions to the resulted precipitation filtrate. It was observed that alum had optimum concentration of 110 mg/L and coagulation pH of 8 whereas FeCl3 had optimum concentration of 80 mg/L and coagulation pH at 6. Sludge product of coagulation had silicate. Zeolite additions could reduce COD, BOD5, TSS, and Zn values in its resulted precipitation filtrate however the reduction was not significant and COD, BOD5, TSS, and Zn values were still above the standard of safe quality wastewater.
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Judul: Optimasi Penggunaan Koagulan Terhadap Rancangan Unit Koagulasi, Flokulasi, dan Sedimentasi pada Pengolahan Air Limbah Laboratorium
Abstrak: Laboratories wastewater of Bogor Agricultural University (IPB) Dramaga is one of the parties who contribute environmental pollution. Waste Water Treatment Plant (WWTP) located in front of the Veterinary Medicine Faculty serves to treat wastewater in order that appropiate with the treshold. The systems which is used in WWTP IPB is coagulation, flocculation, sedimentation, filter system (sand filters and carbon filters), and disinfection. The objective of this research is to analyze the characteristics of laboratiories wastewater, optimization of using coagulants, and designing coagulation-flocculation and sedimentation units, along with making the mass balance. This study done in two stages, the first stage was primary and secondary data collecting and the second stage was wastewater characteristics analyzing, doing jar test, and design units. Based on the results, the parameters pH, N-NO2, NH3, H2S has met quality standards but TDS, COD, BOD, oil and grease do not meet the threshold . The final concentration of TDS, COD, BOD, and oil and grease in a row at 11273 mg /L, 3300 mg/L, 442 mg/L, and 181 mg/L. The optimum dose of coagulant that can be used for wastewater treatment lab was 6250 mg/L PAC + 62500 mg/L alum. The mass balance indicates that TSS concentration at efluent already under the threshold that is 93 mg/L, whereas BOD was still above the threshold which was 331.77 mg / L. On coagulation and flocculation unit, stirrer speed does not meet the criteria. On sedimentation unit, BOD can be reduced up to 48 % and TSS reduction can be up to 70 %.
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Judul: Karakteristik Barisan Eksak Pendek HomR(N, ) dan HomR( ,N)
Abstrak: Module merupakan generaIisasi dari ruang ve}ctor, dimana pada ruang vektor skalar-skalamya berasal dati suatu lapangan (field) sedangkan pada module skaJar-skalamya merupalam unsur-unsur dan suatu ring R dengan unsur satuan. Dari suatu grup komutatif yang unsur-unsumya dipadukan dengan unsur-unsur dart suatu ring R, maka akan mengbastlk.an yang namanya R-module. Himpunan seroua fungsi homomorfisma yang memetakan dati R-module M ke R-module N dinotasikan sebagai HomiM,N), dimana HomiM,N) juga merupakan suatu R-module.
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