معالجة مياه الصرف الصحي باستخدام طريقة مفاعل السرير الحيوي المتحرك (MBBR)

الموضوعات

علوم تطبيقية وتكنولوجية

روابط وملفات

التعريف والنوع

رقم الوثيقة

0ea8c7ee-1c41-4686-a36a-0de8b3e46b24

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

1962545_1.pdf

بيانات النشر

ترجمة العنوان

Treatment of Wastewater by Moving Bed Biofilm Reactor

ألقاب المؤلفين

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اللغة

Arabic

المصدر والدورية

اسم المصدر

معالجة مياه الصرف الصحي باستخدام طريقة مفاعل السرير الحيوي المتحرك (MBBR)

المحتوى والصفحات

عدد الصفحات

99

ترجمة الملخص

Limited water resources and increasing urbanization require a more advanced technology to preserve water quality. Wastewater has been continuously and excessively released into the environment, causing significant impacts on human and wild life. Many organic compounds in municipal wastewater are detected in different types of wastewater, affecting water quality, human health and biodiversity in the ecosystems. These compounds have significant impacts on receiving water bodies so as finding an appropriate treatment technology to effectively remove organic matters (OMs) in wastewater is very essential One of the important factors affecting water quality is the enrichment of nutrients in water bodies. Wastewater with high levels of organic matter (COD) Phosphorus (P) and Nitrogen (N) cause several problems, such as eutrophication, oxygen consumption and toxicity, when discharged to the environment. It is, therefore, necessary to remove these substances from wastewaters for reducing their harm to environments. Biological processes are a cost-effective and environmentally sound alternative to the chemical treatment of wastewater. Biological processes based upon suspended biomass (i.e., Activated sludge processes) are effective for organic carbon and nutrient removal in municipal wastewater plants. But there are some problems of sludge settleability and the need of large reactors and settling tanks and biomass recycling. Biofilm processes have proved to be reliable for organic carbon and nutrients removal without some of the problems of activated sludge processes. Biofilm reactors are especially useful when slow growing organisms like nitrifiers have to be kept in a wastewater treatment process. Both nitrification and denitrification have been individually successful in the Biofilm reactor. There are already many different Biofilm systems in use, such as trickling filters, Rotating Biological Contactors (RBCs), fixed media submerged bio-filters, granular media bio-filters, fluidized bed reactors, etc. They all have advantages and disadvantages. Two technologies are commonly used for biological treatment of sewage: activated sludge and trickling filters. A moving bed biological reactor (MBBR) is a compilation of these two technologies. The biomass in the MBBR exists in two forms: suspended flocks and a biofilm attached to carriers. It can be operated at high organic loads and it is less sensitive to hydraulic overloading. The Moving Bed Biofilm Reactor (MBBR) is a highly effective biological treatment process that was developed on the basis of conventional activated sludge process and bio-filter process. It is a completely mixed and continuously operated Biofilm reactor, where the biomass is grown on small carrier elements that have a little lighter density than water and are kept in movement along with a water stream inside the reactor. The movement inside a reactor can be caused by aeration in an aerobic reactor and by a mechanical stirrer in an anaerobic or anoxic reactor. Researchers have proven that MBBR possesses have many excellent traits such as high biomass, high COD loading, strong tolerance to loading impact, relatively smaller reactor and no sludge bulking problem. There are presently more than 400 large-scale wastewater treatment plants based on this process in operation in 22 different countries all over the world. During the past decade it has been successfully used for the treatment of many industrial effluents including pulp and paper industry waste, poultry processing wastewater, cheese factory wastes, refinery and slaughter house waste, phenolic wastewater, dairy wastewater and municipal wastewater. Recently, Moving Bed Biofilm Reactor (MBBR) has brought increasing research interest in practice for removal of biodegradable organic matter and its application has undergone various degrees of modification and development. Moreover, as the carrier using in the MBBR is playing a crucial role in system performance, choosing the most efficient carrier could enhance the MBBR performance. Hence, scientists have been looking for an appropriate carrier which is not costly and has a suitable surface for microbial growth. The main aim of this study is to evaluate a specific MBBR with polyethylene media as Biofilm support carrier interms of OMs removal along with nutrient removal and microbial growth and activity Taking off process :Taking off process has been studied.it took 42days in which the decrease of COD values have been noticed till the value of COD (110)mg/l after 42 days has been proved, in which the removing efficiency of COD and TDS has been improved along with the increasing of taking off process.*Effect of the Hydraulic Retention Time :The effect of Hydraulic retention time’s upon the efficiency of treatment has been studied, in which we study sixretention times(3-4-5-6-7-8) hours. It has been noticed that the decrease of concentration of COD, TDS, NO3-and PO4-3goes along with the increasing of hydraulic retention time.*Effect of raw water primary concentration: The effect of raw water primary concentrationup on the treatment efficiency has been studied at retention time 6 hours and, which we studied four primitive concentration and it has been noticed that the increase of concentration of COD in the treated water decreases the removing efficiency.*Biological phosphorus and nitrogen removal from wastewater using moving bed bio film process: Biological phosphorus removal: Enhanced biological phosphorus removal (EBPR) was carried out in this study. In the biological phosphorus removal, the phosphorus in the influent wastewater is in corporated into cell biomass, which subsequently is removed from the process as a result of sludge wasting .Phosphorus accumulating organisms (PAOs) are encouraged to grow and consume phosphorus in systems that use a reactor configuration that provides PAOs with a competitive advantage over other bacteria Phosphorus removal in biological systems is based on the following observations1-Numerous bacteria are capable of storing excessa mounts of phosphorus as polyphosphates in their cells.2-Under the anaerobic conditions, PAOs will assimilate fermentation products (e.g., volatile fatty acids)into storage products within the cells with the concomitantrelease of phosphorus from stored polyphosphates.3-Under the anoxic or aerobic conditions, energy is produced by the oxidation of storage products and polyphosphates storage increases within the cell. Under the conditions (600 mg of COD/land 40mg of PO4-P/l), phosphorus removal efficiency up to 67% occurred in the lab-scale MBBR system and the phosphorus removal efficiency was decreased with increasing of COD concentration in raw was tewater the phosphate removal rate showed a strong correlation with the phosphateloading rate in the aerobic reactor. The results of the MBBR kinetic analysis with respect to phosphorus removal showed that the Stover-Kincannon model was more appropriate than the first-order substrate removal model. Biological Nitrogen removal :Total nitrogen removalin wastewater treatment plants is most commonly and most economically achieved in a two stage-system, i.e. nitrification and denitrification. Nitrification transformsammonia to a more oxidized nitrogen compoundsuch as nitrite or nitrate, which is then converted to nitrogen gas in the subsequent denitrification process .The results suggest that the nitrification may be in hibited by substrate (ammonium) concentration so in creasing the ammonium load leads to increasing the nitrificationrates. Normally, the aerobic reactor(R3) was found to have very low heterotrophic activity and significantly higher nitrification rates. It may be assumed that reactor 3has a biofilm with a thinner layer of heterotrophs and a significantly higher density of nitrifiers .So, excellent NH4conversion has been obtained at overall concentrationup to 25mg NH4 /l to 125mg NH4 /l, which is the highest load tested. The removal efficiency was 95.44% for nitrification, while it was reached to82.1% for denitrification process when concentration of COD and Ammonium in raw water were 600, 25 mg/l respectly. The results of the MBBR kinetic analysis with respect to Nitrogen removal showed that the Stover- Kincannon model was more appropriate than the first-order substrate removal model. Effect of the DO concentration: The removal efficiency of Ammonium was increased by increasing od DO concentration in aerobic reactor.

إشراف وإعداد

الإشراف

ناهد فرهود

الإعداد

بيان أنس الدريس

الاقتباسات الببليوغرافية