Removing of Heavy Metals from Sewage Water Using Chitosan Extracted from Crustacean Waste

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.

The Use of Treated Waste Water in Growth and Production of Indoor Tomato

استخدام مياه الصرف الصحي المعالجة في نمو وانتاج البندورة المحمية التحاليل الكيميائية والقياسات الفيزيائية. التحليل الاحصائي العناصر الغذائية تصميم الترجمة. مياه الصرف الصحي المعالجة.

Use of Non-Conventional Water in the Production of Safe Fodder Crops

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 was 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.

Study of Some Water and Soil Pollution Parameters of Rumaila River in Jableh, Lattakia

This research was carried out during 2014 - 2015. The research aimd to describe some chemical characteristics of the river's water used for irrigation, chemically compare it with the Syrian Standards Specifications in terms of salt quantity and quality and Cd and B concentrations, water samples were taken from four observation points along the river: A (domestic), B (industrial), C (mixed) and D (estuary), also Soil samples from the river edges were also analyzed. The findings revealed that the EC value in B was 0.61 mg/l i.e. less than those of others, with significant difference 0.72, 0.74, 0.73 mg/l, respectively. The study also showed a significant increase in B and C concentration by 0.48 and 0.49 mg/l, respectively, compared with A and D by 0.4 mg/l each. A significant increase in Cd concentration was noticed for B, C and D by 0.73, 0.88 and 0.75 mg/l vs. A 0.67 mg/l. However, Cd concentration in the river water in all seasons and sites was excessive and higher than the permissible limit for water discharge into seas estimated at 0.05 mg/l, whereas the other parameters were lower than the permissible limits according to the Syrian Standards. The effect of water pollution on soil showed a significant increase in EC for B by 1.01 dS/m than others. The increase was also more significant in subsurface layer than surface one by 0.45 and 0.62 dS/m, respectively. In addition, the findings demonstrated a significant increase in Cd for C (2.67 mg/kg) than other points. The increase in Cd concentration was more significant in the surface layer (2.648 mg/kg) than the subsurface one (2.631 mg/kg), and this concentration was lower than the normal range of soil content from Cd (3 ppm).

The Syrian Water Situation – An Analytical Study with Future Prospects

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 future 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.

A Comparison Between monopolar and bipolar Electrode configurations on Removal of chromium from synthetic wastewater by Electrocoagulation Process

In this work, the performance of batch electrocoagulation (EC) treatment using iron electrodes with monopolar and bipolar electrode configurations for trivalent chromium (Cr (III)) removal from a synthetic wastewater was investigated. The influences of current density (from 2 to 25 mA/cm2) and initial metal concentration (from 100 to 250 mg/L) on the removal efficiency were explored in a batch stirred cell for monopolar and bipolar configurations. Removal of Cr (III) by EC process from aqueous solution with both monopolar and bipolar electrode configurations was a feasible process. For the initial Cr (III) concentration of 250 mg/L, almost complete removal (99.88%) of Cr (III) was noted after 20 min of EC in case of bipolar electrode arrangement at 25 mA/cm2 with 4.5 mmol/L of supporting electrolyte (Na2SO4) against 89.58% of Cr (III) removal for monopole electrode configuration. At the same electrolysis time, the power consumption was 47 and 15.3 kWh/m3 in case of monopolar and bipolar configuration respectively for the previous removal conditions.

Study of the efficiency of aerobic treatment of primary sludge resulting from sewage sedimentation

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.

Microbiology pollution in some irrigated agricultural vegetables with treatment sewage from Sheikh Saeed station

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 contamination 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).

A Contribution to Studying Settling Factor and Thickening of Activated Sludge in wastewater treatment plant

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 highly- 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.

An evaluation of the distribution of DO concentrations in aeration tanks at Lattakia WWTPs

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.