Judul: Analyze the flow of water and dissolved materials through a horizontal roughing filter
Abstrak: Utilization of Horizontal Roughing Filter (coarse sieve - HRF) provides an alternative treatment system to improve water quality are distributed, to the provision of clean water without using chemicals, is an alternative treatment that is effective, efficient, low cost, and feasible. Horizontal Roughing Filter (coarse-HRF) is a preliminary treatment to reduce turbidity or solids separating large amounts of organic matter and chemical pollution. Water passes through air or compartment in a porous media such as coarse gravel with different diameter. Large diameter gravel is placed on the face and smaller diameter gravel is in the next section, and so on. A research was conducted to analyze the flow of water and dissolved materials through a horizontal roughing filter. The objective was to improve the quality of raw water river for drinking water treatment, by reducing its turbidity and organic matter content.The use of horizontal roughing filters as alternative method and tool can be conducted on an on going basis. Results obtained from this study building performance HRF as follows: to decrease by 51% the value of turbidity, organic content values can be reduced by 71%, has a flow rate of 53 cm3/sec, and hydraulic conductivity of 31.7 cm/sec.
Keyword: Analysis of water flow, horizontal roughing filter, organic matter, turbidity

Judul: Penurunan Bahan Polutan Air Baku Biofiltrasi dengan Media Pengisi Pasir dan Plastik Sarang Tawon
Abstrak: Biofiltration is a biological treatment process utilizing the biofilm activity of certain microorganisms. The microorganism is utilized to degrade contaminants in the raw water. River water is widely used for drinking water supply, although it sometimes does not meet the standard of raw water. This research was aimed to determine the effectivity of biofiltration to pre-treat raw water and to evaluate the capability of biofiltration in equalizing a quality fluctuation. Honeycomb plastic and sand were used as media in this study. Continuous air supply was done so that an aerobic condition was created. This study was conducted to determine the effectiveness of biofilters for the treatment of raw water and to determine the capability of the biofilters in equalizing of a quality fluctuations. The research consisted of three stages, namely characterization of the raw water, the acclimatization for 4 weeks and loading test. The biofiltration with sand as media could reduce organic pollutants (COD) approx. 80%, that was higher than the COD reduction approx. 69% by biofiltration using honeycomb plastic has. Sand media biofiltration with detergent loading rate of 0.1-32 mg/L resulted in detergent reduction of approx. 55%, whereas the biofilter with honeycomb plastic resulted in detergent reduction of approx. 45%. Generally, increased loading rate would resulted in reducing of pollutant, both media. The absolut pollutants removal increased with increasing of load.
Keyword: contaminated raw water, biofilm, Biofiltration

Judul: Psittacosis Sebagai Zoonosis Penting Yang Berasal Dari Burung
Abstrak: Psittacosis atau ornithosis adalah penyakit menular dari burung kepada manusia. Agens penyebab psittacosis termasuk ke dalam virus psittacosis-lymphogranuloma venereum group yang disebut Chlamydia psittaci. C. psittaci hanya dapat berkembang biak di dalam jaringan hidup tetapi peka terhadap antibiotik. Penyebaran penyakit ini sangat luas, terdapat hampir di seluruh dunia. Di Indonesia penyakit ini belum pernah di diagnosa, tetapi mengingat terdapat demikian banyaknya jenis burung maka diperkirakan psittacosis ini sudah ada. Kasus pada manusia pertamakali ditemukan oleh Ritter pada tahun 1879, di Eropa. Waktu itu dikenal sebagai pneumotyphus. Chlamydia psittaci tidak hanya sebagai penyebab infeksi pada burung, juga bisa menyebabkan infeksi pada mamalia diantaranya sapi, kerbau, kambing, domba, babi dan kucing. Pada kucing dikenal sebagai feline pneumonitis. Pada domba atau kambing mengakibatkan enzootic abortion. Pada burung, kalkun merupakan unggas paling rentan diikuti oleh burung psittacine dan burung lain di luar famili psittacidae. Virulensinyapun berbeda-beda. Yang berasal dari kalkun bervirulensi tinggi, sedangkan yang berasal dari burung merpati bisa bervirulensi tinggi bisa juga bervirulensi rendah. Penularan terjadi melalui kontak langsung maupun ti- dak langsung. Penularan melalui telur tidak terjadi. Umumnya penyakit ini memperlihatkan gejala klinis berupa deman, lesu, lemah, anorexia, kurus, diarrhea ber- warna kekuningan, discharge dari mata dan hidung, conjunc- tivitis. Gejala khas pada kalkun adalah istirahat dengan sternum sebagai dasarnya, karena adanya tekanan dari bagian perut yang sakit. Sedangkan pada manusia memperlihatkan adanya demam, kadang-kadang merasa dingin, lesu, sakit kepala yang hebat, sakit pada bagian belakang badan dan photophobia…dst
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