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Register a new userStudy of the efficiency of aerobic treatment of primary sludge resulting from sewage sedimentation
دراسة كفاءة المعالجة الهوائية للحمأة الأولية الناتجة عن ترسيب مياه الصرف الصحي
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Aِl-Baath University رسالة ماجستير
Publication date
2016
fields
Civil Engineering
and research's language is
العربية
Created by
Shamra Editor
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أجريت الدراسة لتحديد كفاءة المعالجة الهوائية للحمأة الأولية الناتجة عن ترسيب مياه الصرف الصحي و تحديد زمن المكوث الأمثلي عن طريق قياس مؤشرات المواد الصلبة الكلية والإحتياج الكيميائي للأوكسجين والمحتوى العضوي وقابلية الحمأة لنزع الماء منها.
The study was conducted to determine the efficiency of the aerobic treatment of primary sludge resulting from sewage sedimentation and to determine the optimum residence time by measuring the indicators of total solids, chemical oxygen demand, organic content and dewatering ability of the sludge.
References used
كتاب الصرف الصحي (2) محطات معالجة مياه المجاري - د. جوزيف ميخائيل - د. رصين زكية - جامعة البعث - عام 2002م
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This study was performed at three plants for sewage treatment in Syrian coastal
villages: al-Hara, Murj-Muairban, and Hibbeat. Dry sludge samples were collected from
drying sludge basins monthly, during the period October 2011-September 2012. We
d
epended on different global ways to isolate the eggs from the sludge (flotation,
sedimentation, filtration through special sieves).
The microscopic study results of the sediment showed the presence of 5 different
species of the parasitic worm-eggs, belonged taxonomically to five different species of
parasitic worms, two species belonged to Nematoda: Ascaris lumbricoides and Trichuris
trichura, and three species belonged to Platyhelminthes: one species of them belonged to
Trematoda: Schistosoma mansoni, and the other two species belonged to cestodes: Taenia
saginata, and Diphyllobothrium latum.
The average number of worms eggs isolated from the dry sludge resulting from the
three studied sewage treatment plants (al-Hara, Murj-Muairban, and Hibbeat) recorded
relatively close values, the most number in the dry sludge resulting from the treatment
plant in Hibbeat with an average 97.16% eggs/50g, then al-Hara with an average
75.08egg/50g dry sludge. Also the results showed that the isolated eggs were more
diversed in Hibbeat treatment plant, this an indicator of the health status of the population
in the studied sites.
Study showed that the number and diversity of parasitic worm – eggs use more
observed in Summer and Autumn than in Winter and Spring.
The activated sludge is one of the most common methods of sewage treatment , which has been studied through to find the relation between sedimentation properties and the performance of aeration units. sedimentation experiments were applied on a highl
y- aerated activated sludge experimental treatment plant .Also, another experiments were applied on Marj Maerban treatment plant which is operated using the extended aeration method in order to find the Factors influencing the settling of activated sludge . These experiments were done using the Sludge volume index (SVI) ,the maximum velocity sedimentation rate (UMAX) and the time corresponding to the maximum velocity of sedimentation (TUMAX).In experimental treatment plant. We found that the sedimentation experimental parameters (Vo, n) are very sensitive and can be changed significantly with changing the values of suspended solids (MLSS) in the aeration tank. The mathematical relationships can be used to predict the value of (Vo, n) as well as designing and selecting the operating system of sludge without resorting to a conventional sedimentation tests . We also found in the extended aeration the maximum velocity sedimentation rate (UMAX) is the most important in settling process as we got some good correlation coefficients (R2) between UMAX and (TUMAX, MLSS, SVI) was at a temperature (20OC) were respectively (98, 96,98%), and when the temperature (17 OC) respectively (97,96,97%) which is almost the same values. We noticed that the sludge volume index (SVI) is closely associated with the settling parameters (UMAX, TUMAX) with the correlation coefficients were respectively (98,99%) on the temperature of (20OC) and (98,97%) on the temperature of (17OC) . Velocity sedimentation rate (UMAX) was the largest and deposition time (TUMAX) was smaller on the temperature of (20OC) Indicating an improved sedimentation with higher temperatures . Subsequently, temperature is an influential factor on deposition and It is necessary to be taken into account in the design and operation of activated sludge treatment plan.
Objective: This research aimed to evaluate the three-dimensional
effects of a Twin Block (TB) appliance on the pharyngeal airway
passage (PAP) in a sample of Class II patients with mandibular
retrusion using cone-beam computed tomography (CBCT).
This research has included quarterly and periodically physical and chemical analysis of treatment wastewater in the Latakia countryside during year 2011 by testing three treatment plants similar in the mechanism of action and distributed in three v
illages (Happit, Al-Harah, Marg Moairban).
This study has included the measurement of temperature, pH, dissolved oxygen, turbidity, and determination of nitrate, phosphate, sulfate, and chloride.
In this research, potentiometric using Selective Electrodes ISEs, the Visible Spectrum, and the Turbidimetry methods were used.
The results showed significant differences in concentrations of the studied ions between one station to another. The highest nitrate concentrations (228.33mg/l) were recorded in Happit treatment plant especially in summer, and the highest phosphate concentrations (41.81mg/l) were in Happit treatment plant in summer. Whilst the highest sulfate concentrations which ranged between (508.67– 1157.33)mg/l were in Al-Harah treatment plant at all seasons. The highest chloride concentrations (310.33mg/l) recorded in Happit treatment plant in summer.
The statistical study has demonstrated and showed high and sometimes low correlation coefficient R2 so that gives clear indications about the sources of pollution.
The determination of sludge characteristics of wastewater treatment process has the
primary role in the treatment and disposal. This research aims to determine the sludge
characteristics by studying specific resistance factor of the sludge on the f
iltration at Merge
Maarban station, so we took samples of sludge from the station and made several
laboratory experiments and we got the time of intensify sludge, moisture and The
concentration of the solid substances. we calculated specific resistance factor values of the
sludge when the moisture values are ( 97.5 , 95.5 , 94 , 92 , 91 , 88 ) %. The research
results showed a decrease in resistivity factor value of sludge on the filtration as its
moisture become less and the sludge drying time takes tow weeks.
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