Judul: Evaluation Of Process And Installation Design Of Activated Sludge For Pharmaceutical Wastewater
Abstrak: Perkembangan ilmu pengetahuan dan teknologi mendorong industri farmasi menghasilkan produk obat-obatan berkualitas tinggi. Hasil dari produksi tersebut menghasilkan produk samping berupa limbah. Beberapa penelitian menunjukkan adanya pengaruh limbah farmasi terhadap reproduksi organisme perairan dan perubahan embrio pada manusia. Oleh karena itu, dibutuhkan evaluasi terhadap aspek teknis dan aspek variabel operasional pada IPAL, salah satunya unit lumpur aktif. Penelitian ini bertujuan untuk mengevaluasi dan mengoptimasi unit lumpur aktif, serta melakukan re-desain unit pengolahan. Evaluasi pada aspek pengolahan biologis menunjukkan beberapa parameter yang tidak sesuai kriteria perencanaan, diantaranya umur lumpur (θc), rasio F/M, MLSS, volumetric organic loading rate, waktu detensi hidrolis, dan faktor resirkulasi. Kriteria perencanaan dipilih agar unit IPAL dapat berjalan dengan optimal. Berdasarkan hasil penelitian dan kriteria desain perencanaan terpilih didapat dimensi baru unit lumput aktif, yaitu panjang sebesar 9,8 m, lebar 4,9 m, dan tinggi total 2 m. Unit lumpur aktif hasil re-desain dapat mengolah debit air limbah sebesar 371,16 m3 /hari.
Keyword: Activated sludge, evaluation, design criteria, pharmaceutical, waste water

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: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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