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Article
Effect of Particle Size of Sawdust on Behaviour of Sawdust/UPE Composites in Water

Authors: Nisreen S. Ali --- Besma M. Fahad
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2015 Volume: 16 Issue: 4 Pages: 59-65
Publisher: Baghdad University جامعة بغداد

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Abstract

The aim of the present work is to develop a new class of natural fillers based polymer composites with sawdust (S.D) which used two particle sizes (1.2 μm & 2.3 μm) and different weight percentage from sawdust (10%, 15%, and 20%). The mechanical properties studied include hardness (shore D) for all samples at normal conditions (N.C). The unsaturated polyester (UPE) and its composites samples were immersed in water for 30 days to find the effect of particle size of sawdust (S.D) on the weight gain (Mt %) by water for all the samples, also to find the effect of water on their hardness. The results show that the composite materials of sawdust (S.D) fillers which has particle size (1.2 μm) better than (2.3 μm) particle size before & after the immersion in water. Also the results show a decrease in the values of the hardness for the UPE and its composites samples after immersion in water. The results show that the UPE and its composites samples have relatively increased values of weight gain (Mt %) by water with time of immersion, for sawdust composite samples (1.2 μm) particle size the samples of (15%) weight percentage have relatively highest values of weight gain (Mt %) by water but for samples of (2.3 μm) particle size the samples of (20 %) weight percentage have relatively highest values of weight gain (Mt %). Finally results show that the value of weight gain (Mt %) increased with increasing of particle size of sawdust so that the composites samples have highest value of weight gain (Mt %) than UPE sample.


Article
The Role of Filamentous Bacteria Streptomyces sp. in Reduction of Some Nutrients Concentrations in AL- Restomia Waste water Treatment Plant, Baghdad -Iraq
دور البكتريا الخيطية sp. Streptomyces في خفض مغذيات مياه الصرف الصحي لمحطة الرستمية في مدينة بغداد

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Abstract

The role of filamentous bacteria represented by Streptomycessp was studied as biological treatment for activated sludge AL- Restomia treatment unit in Baghdad city. The result shows reducing in phosphate concentration where apprise in started entrance the treatment unit 12.083 mg/L fast the unit stages reached to 8.426 mg /L where nitrate concentration apprises 3.59 mg/l and ending in 2.43 mg/L The concentration of ammonia apprises 1358 mg/L and reached to 140 mg/L. also the TDS concentration reduced from 1426 to 1203 mg/L where nutrient which represented (SO4, Mg, Ca, Na, K) reduced by range 30.883- 23.337 , 194- 121 , 440- 321 , 109.03- 101.53 and 16.85- 15.4mg/L respectively COD reduce from427.263- 82mg/L with absorbance0.018- 0.027 nm.

درس دور البكتيريا الخيطية sp. Streptomycesضمن الحماة المنشطة لمحطة معالجة الرستمية في مدينة بغداد . بينت النتائج أنخفاضاً في تركيز الفوسفات إذ بلغت في بداية دخولها المنظومة 12.083 ملغم / لتر وبمرورها بمراحل المنظومة وصلت الى 8.426 ملغم /لتر أما النترات فقد كانت 3.59 وانتهت بالتركيز 2.43 ملغم / لتر ، وبلغ تركيز الامونيا من 1358 ملغم /لتر وصولا الى 140 ملغم / لتر ، كما أنخفض TDS من 1426 الى 1203 ملغم / لتر أما الاملاح المتمثلة بالكبريتات ، المغنيسيوم ، الكالسيوم ، الصوديوم ، البوتاسيوم فقد انخفضت من 30.883 الى 23.337 و 194 الى 121 و 440 الى 321 ومن 109.03 الى 101.53 و 16.85 الى 15.4 ملغم / لتر على التوالي ، أما المتطلب الكيميائي للأوكسجين فأنخفض من 427.263 الى 82 ملغم / لتر وبأمتصاصية بلغت 0.018 – 0.027 نانوميتر .

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