Biodegrdation of Crude Oil by Using Bacterial Floc Consortium in Wastewater

Abstract: Flocculation is the dynamic processes have special advantages such as safety, strong effect, biodegradability and harmlessness to humans and the environment. Fifteen bacterial isolates obtained from waste water contaminated with oil were screened for floc formation ability, hydrophobicity, biodegradation of crude oil ability and EPS production. The results showed flocculation index by bacterial isolates namely 6E, 7E, A6 and C21 were able to produce high percentage of floc formation 31.9%, 26%, 25% and 24.9%, respectively. The hydrophobicity of the cells express as ability of adherence to crude oil was ranged from 96.5% to 91.7%. All the isolates were able to produce high amount of EPS varied from 1.1g/L to 7.7g/L. Isolate A6 showed the highest degradation of crude oil at 78.3%,whereas isolate A4, 6E and 12C only at 60.1, 57.2% and 55.3%, respectively. The isolates are combination as five groups tends to for high flocculation by exopolysaccharides and remove significant amount of crude oil by biodegradation. Approximately isolates (6E, A6 and A4) results revealed that there degradation percentage and flocculation index more than single isolates were 78.9% and 57.2 % respectively. On the other hand, the bacterial cells of culture consortium (CC) attached closely after seven days than 0 days this can possibly be due to ionic and hydrophobic interaction. The aim of this study is to screen bacterial isolates with the ability of producing biopolymer exopolysaccharides (EPS) to forming floc

Pollution in Shatt Al-Arab River near Hospital Wastewater Disposal – Detection of Pharmaceutical Compounds, Isolation and Identification of Drug-Resistant Bacteria

Pharmaceutical compounds have been introduced into the aquatic ecosystems in multiple ways and sources, which negatively affects the health of the environment and humans. The river near the hospital sewage disposal is host environment for drug-resistant bacteria (DRB). In this context, the aim of the research was to detect the presence of pharmaceuticals in hospital wastewater, after treatment, at river point followed by isolation of bacteria and test for resistant pharmaceutical compound. Fifteen species of bacteria isolated by angiogenic methods were identified and tested using the well diffusion test to determine the resistance of selected bacteria to ibuprofen by survival assessment. This study showed that the ibuprofen detected by GC-mass was available in all selected points at a concentration of 3 to 120 mg/L. Lecuco. mesen.cremris and Koc.rosea have a high ability to break down the ibuprofen compound. Thus, the bacteria isolated from hospital wastewater can biologically degrade ibuprofen

Potential plant leaves as sustainable green coagulant for turbidity removal

Chemical coagulation–flocculation has been used widely in water and wastewater treatment. In the present study, green coagulant was investigated. The role of Iraqi plants was examined to remove turbidity by using kaolin synthetic water. Thirteen selected plants were prepared as powdered coagulant. The experiment was run based on coagulant mass varied from 0 to 10,000 mg/L for each plant with a rapid mixing speed of 180 rpm for 5 min, slow mixing speed at 50 rpm for 15 min and settling time for 30 min. The seven best green coagulants are Albizia lebbeck (L.), Clerodendrum inerme (10,000 mg/L), Azadirachta indica, Conocarpus lancifolius, Phoenix dactylifera (5000 mg/L), Dianthus caryophyllus (3000 mg/L) and Nerium oleander (1000 mg/L) with turbidity removal rates of 39.3%, 51.9%, 67.2%, 75.5%, 51.0%, 52.6% and 57.2%, respectively. The selected seven plants that were used as green coagulants are economically feasible to achieve the highest turbidity and removal of other compounds