Judul: Design of Frozen Cilok Production Wastewater Treatment Process at PT. Karya Baru Kita.
Abstrak: Limbah cair merupakan permasalahan yang dihadapi setiap industri, salah satunya PT. Karya Baru Kita. Hal ini dapat menimbulkan dampak negatif, seperti menghasilkan bau tidak sedap, meningkatkan biaya operasional, dan mencemari lingkungan. Penelitian ini bertujuan untuk mengidentifikasi karakteristik limbah cair yang dihasilkan oleh PT. KBK, merancang proses pengolahan limbah cair yang sesuai sehingga memenuhi baku mutu, serta menganalisis efektivitas dari proses pengolahan yang dilakukan. Berdasarkan karakteristiknya, dirancang proses pengolahan yang menggabungkan beberapa metode pengolahan seperti metode kimia, fisika, dan biologi. Proses koagulasi menggunakan Poly Aluminium Chloride dengan dosis 40 ppm, serta proses aerasi dengan penambahan EM4 sebanyak 0,4% terbukti dapat menurunkan parameter COD dari 27.631 mg/L menjadi 41 mg/L (removal efficiency 99,85%) dan menurunkan parameter TSS dari yang semula 1064 mg/L menjadi 187 mg/L (removal efficiency 82,42%). Proses pengolahan yang dirancang menghasilkan effluent air limbah yang memenuhi baku mutu ditetapkan, artinya limbah cair sudah aman untuk dibuang ke lingkungan., Liquid waste is a problem faced by every industry, one of which is PT Karya Baru Kita. This can have a negative impact, such as producing unpleasant odors, increasing operational costs, and environmental pollution. This study aims to identify the characteristics of liquid waste generated by PT KBK, design a suitable liquid waste treatment process so that it meets quality standards, and analyze the effectiveness of the treatment process carried out. Based on its characteristics, a treatment process is designed that combines several treatment methods such as chemical, physical, and biological methods. The coagulation process using Poly Aluminum Chloride with a dose of 40 ppm, as well as the aeration process with the addition of EM4 as much as 0,4% proved to be able to reduce COD from 27.631 mg/L to 41 mg/L (removal efficiency 99,85%) and TSS from 1064 mg/L to 187 mg/L (removal efficiency 82,42%). The designed treatment process has produced wastewater effluent that meets the established quality standards, meaning that the wastewater is safe to be discharged into the environment.
Keyword: EM4, aeration, coagulation, PAC

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: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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