Judul: Performance Evaluation and Design of Combination of  Physicochemical and Biological Textile Wastewater Units
Abstrak: The textile industry in Pekalongan Regency produces liquid waste from dyeing, starch, printing and finishing activities. The Wastewater Treatment Plant (WWTP) is an effort used by the industry in treating wastewater. WWTP consists of physical processes, combined physico-chemical and biological units. This study aims to evaluate the combination of physicochemical and biological units both in terms of performance and in terms of design based on wastewater characteristics and existing dimensions. Data collection was carried out by observing, interviewing, testing in the field, and testing in the laboratory. Recommendations in the form of adding aerator units and regulating facultative unit influent discharge due to performance and capacity in field conditions that are not met according to analysis. The effect of the biokinetic coefficient on the level of concentration of pollutant load S1 and HRT has been fulfilled even though the coefficient Y and k does not meet the criteria. The influence of SRT biokinetic coefficients is not appropriate due to the absence of Qw. Total TSS production is affected by an increase in the growth rate of biomass (Px). The increase Px is affected by the influent discharge and the increasing coefficient Yobs. Variation of influent discharge also affects the level of food production (F/M) and oxygen demand for microorganisms. Detention times that exceed the criteria for a combination of physicochemical and secondary sedimentation can be corrected by reducing dimensions resulting in minimum volume. The stirrer in the coagulation.
Keyword: textile wastewater, evaluation, WWTP

Judul: Rancangan Unit Instalasi Pengolahan Air Limbah dengan Pengolahan Biologis Attached Growth
Abstrak: Industrial development in Indonesia, cause negative impact on environment, such as water pollution. One way to overcome this problem is by developing wastewater treatment plant (WWTP). However not all industries have WWTP, for instance is PT. L in Jakarta. The research objectives were to analyze and identify PT. L wastewater characteristic, to design PT. L’s WWTP with attached growth process. The method used was based on SNI of wastewater analyzing, Regulation of Minister of the Environment Number 03/2010, and DKI Jakarta’s Governor Regulation Number 582/2005. Result of the analysis showed TSS, NH3, BOD, and COD exceeded the threshold and the units that is used is equalization tank, bar screen, grit chamber, primary sedimentation, rotating biological contactor (RBC), clarifier, disinfection, sludge thickener, and sludge digester. Attached growth process which was chosen was RBC because it could remove more BOD’s concentration into 15 mg/L. RBC would have four stages with four train. RBC medium that was used was polyethylene with 37% submergence and hydraulic retention time was 16 hours. The others parameters, TSS, NH3, and COD’s concentration also remove as well as BOD.
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Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
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