The biological role of chitosan which was prepared by chemical method from
shrimp waste Penaeus semisulcatus and the outer skeleton for marine crab Portunus
pelagicus in some industrial and agricultural applications were studied. The
concentration
of prepared chitosan was 1% (w/v) at pH (4 and 8) for 12 hours in
precipitation and chelating heavy metals (Lead, Zinc, Iron, Cupper and Cadmium)
from of sewage water. Concentration of elements was measured by Flame Atomic
Absorption Spectrophotometer ) FAAS). The results of the study indicated that the
concentration of the water elements was high before treated with chitosan. The
results showed a significant (p<0.05) decrease in element concentration percentage
after treated with crab chitosan. In contrast, shrimp chitosan displayed a minimum
effect on decreasing the amount of heavy metals. Moreover, the results showed that
the higher percentage for mineral adsorption was at pH (4 as compared with 8).
The results confirmed the possibility of using chitosan in chelate and precipitate the
mineral ions from polluted water.
استخدام مياه الصرف الصحي المعالجة في نمو وانتاج البندورة المحمية
التحاليل الكيميائية والقياسات الفيزيائية.
التحليل الاحصائي
العناصر الغذائية
تصميم الترجمة.
مياه الصرف الصحي المعالجة.
An experiment was conducted for two seasons 2015 -2016, to study the effect
of treated waste water (TWW) on some fodder crops productivity at Salamieh
Research Center (GCSAR), on triticale and sesbania crops within crop rotation. This
experiment w
as conducted with collaboration between (ACSAD) and (GCSAR).
The experimental design was split plot design with three replicates, using drip
irrigation (DI) and surface irrigation (SI) systems with two treatments namely fresh
water (FW) and (TWW). Soil and water were analyzed before cultivation.
This research aims to shed a light on the current state of the
Syrian water resource through studying the present resources
and analyzing the demand on them and their availability
during the period (1992-2012). This study focues at deriving
the f
uture forecast on the development of the demand on these
resources in order to better conceptualize their current state.
This in turn will lead to concluding a set of results and
recommendations that could contribute to improve the state of
the water resource in the sense of achieving sustainability and
prohibiting its depletion through the efficient and planned
usage.
food security
الأمن الغذائي
مياه الصرف الزراعي
Water balance
العجز المائي
الأحواض الهيدرولوجية
محدودية الموارد المائية
Water deficit
Hydrological basins
Limited water resources
الموازنة المائية
مياه الصرف الصحي
مياه الصرف الصناعي
الأمن المائي
استمطار الغيوم
Sewage
Industrial Wastewater
Agricultural Drainage Water
Seeding Clouds
Water Security
المزيد..
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.
The research was conducted with the aim of investigating in the
most important pathogens (coliform_ E.coli_ Salmonella), which
moves from irrigation water to many types of vegetables which
irrigated from it. And compared the extent of contaminatio
n by
irrigation source (treatment sewage, wells), and according to the
type of vegetable (fruit plants, tuberous vegetables), and the
irrigation method(surface irrigation, modern irrigation).
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.
This research includes monitoring the distribution of DO concentrations in the Marj Maarban and AL Ruyemih WWTPs which use different types of aeration systems (surface aerators and diffusers). Research has shown a remarkable increase in the values of
DO concentrations in the studied aeration basins above 2 mg/l which means an increased electricity consumption and operational problems, in addition to the role of the natural aeration process in reducing the number of aerators operation hours. This will reflect positively on the performance of the plant and the investment cost.
This research has included quarterly and periodically physical and chemical analysis
of treatment wastewater in the rural areas of Latakia city during year 2011 by testing
three treatment plants similar in the mechanism of action and distributed in
three villages
(Happit, Al-Harah, Marg Moairban).
This study has included the measurement of temperature T, pH, and determination of
sodium, potassium, calcium concentrations, and sodium adsorbed rate (SAR).
This study was based on the potentiometrictechnic using Ion Selective Electrodes
(ISEs).
SAR measurements have shown that there are clear differences between autumn and
other seasons, and between treatment plants. The highest values was in the Happit
treatment plant in all seasons and the highest value was (88.25 mg/L) in the autumn which
is much larger than the allowable limit.
The highest concentrations of sodium ion were in the autumn in all treatment plants
(1002.67-7130.33) mg/L, which is off limits. As for the potassium ion concentration was
highest (72.46 mg/L) in Happit treatment plant in the autumn. While calcium ion
concentrations in Al-Harah treatment plant was exceeded (670.33-800.00) mg/L the
allowable limit in all seasons except the summer.
The statistical study has demonstrated and showed strongand sometimes weak
correlation coefficient R2 so that gives clear indications about the sources of pollution.
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.
