Judul: Analysis of Wastewater Treatment Plants Performance and Water Reuse in Concrete Product Manufacturing Plant
Abstrak: Penelitian ini bertujuan mengkaji implementasi pengolahan air limbah untuk resirkulasi pada industri penghasil produk beton, serta menentukan nilai efisiensi penyisihan polutan pada unit IPAL, dengan fokus pada industri penghasil produk beton di Kabupaten Bogor. Penerapan konsep zero waste di industri ini bertujuan untuk meminimalkan dampak lingkungan dari limbah cair yang mengandung pH tinggi, logam berat, bahan kimia, dan padatan tersuspensi dengan mempertimbangkan resirkulasi sebagai solusi pengelolaan yang berkelanjutan. Metode pengambilan sampel untuk menganalisis data dilakukan dengan metode grab sampling. Hasil analisis menunjukkan bahwa proses pengolahan air limbah di industri penghasil produk beton dilakukan dengan unit sedimentasi dan media filter sederhana. Dengan waktu detensi (td) yang dihasilkan, konsentrasi pH, TDS, TSS, COD, dan Nitrit masing-masing memiliki kisaran 6 – 7, 71 – 160 mg/l, 0.0027 – 0.0203 mg/l, 241.40 – 444.38 mg/l, dan 0.17 – 0.98 mg/l dengan penyisihan sebesar 38.47%, -88.72%, 23.78%, dan 95.80%. Saran yang dapat diberikan adalah diperlukan pemantauan debit air setiap unit IPAL agar hasil analisisnya lebih akurat., This study aims to examine the implementation of wastewater treatment for recycling in industry, and to determine the efficiency of pollutant removal efficiency in wastewater treatment plants (WWTPs), focusing on the concrete production industry in Bogor Regency. The application of zero waste concept in this industry aims to minimize environmental impact of wastewater containing high pH, heavy metals, chemicals, and suspended solids by considering recycling as a sustainable management solution. Sampling for data analysis was conducted using grab sampling method. The analysis results indicate that wastewater treatment in the concrete production industry involves sedimentation units and simple filter media. The detention time (td) produced, pH concentration, Total Dissolved Solids (TDS), Total Suspended Solids (TSS), Chemical Oxygen Demand (COD), and Nitrite each fall within ranges of 6 – 7, 71 – 160 mg/l, 0.0027 – 0.0203 mg/l, 241.40 – 444.38 mg/l, and 0.17 – 0.98 mg/l respectively, with removal efficiencies of 38.47%, 88.72%, 23.78%, and 95.80%. Recommendations include the necessity of monitoring water flow rates in each WWTP unit for more accurate analysis results.
Keyword: Air limbah industri, efisiensi penyisihan, penggunaan kembali air, produksi beton

Judul: Rancangan Instalasi Pengolahan Air limbah Industri dengan proses biologis Biological nutrient removal
Abstrak: Kegiatan industri yang menghasilkan limbah cair, berpotensi menimbulkan pencemaran air di lingkungan apabila tidak diolah dengan sesuai. Penelitian ini bertujuan menganalisis dan mengidentifikasi karakteristik limbah cair PT. W, membuat rancangan unit IPAL yang sesuai, serta menganalisis efektivitas penggunaan mikroba pada pengolahan biologis biological nutrient removal. Metode pengujian serta baku mutu yang digunakan adalah SNI pengujian air limbah, Peraturan Menteri Negara Lingkungan Hidup Nomor 03 Tahun 2010, dan Keputusan Gubernur DKI Jakarta No. 582 Tahun 2005. Hasil analisis menunjukkan bahwa nilai Total Suspended Solids (TSS), amonia (NH3), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Sulfida (S), minyak dan lemak serta fecal coliform melampaui baku mutu sehingga perlu diolah lebih lanjut. Rancangan unit IPAL yang digunakan adalah bak ekualisasi, bak penampung, bar screen, grit chamber, sedimentasi primer, biological nutrient removal, clarifier, desinfeksi, sludge thickener, sludge digester, dan sludge drying bed. Biological nutrient removal merupakan unit pengolahan biologis suspended growth yang dipilih karena unit dapat dirancang untuk menurunkan nilai BOD, TSS, dan NH3 menjadi 10 mg/l, 10 mg/l, dan 1 mg/l. Tingkat efektivitas penggunaan mikroorganisme dalam unit ini dapat diketahui dari persen penurunan nilai parameter pencemar., Industrial activities that produces waste water, causes water pollution if it not treated properly. The research objectives were to analyze and identify PT. W wastewater characteristic, to design an appropriate WWTP of PT. W and analyze the effectiveness of microorganism at biological process biological nutrient removal. 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, S, BOD, COD, oil and grease, and fecal coliform exceeded the threshold. The units that used are equalization tank, bar screen, grit chamber, primary sedimentation, biological nutrient removal (BNR), clarifier, disinfection, sludge thickener, sludge digester, and sludge drying bed. Biological nutrient removal is suspended growth biological process were chosen because it could remove BOD, TSS, and NH3 concentration into 10 mg/l, 10 mg/l, and 1 mg/l. The effectivity of microorganism uses can be known by percent removal of indicator concentrations.
Keyword: air limbah, biological nutrient removal, IPAL

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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