Papers by Keyword: Biotreatment

Abstract: Aiming to the problem that the removal rates of COD, BOD₅, SS is low, economic benefits and efficiency are poor on traditional treatment of cassava starch wastewater, a new treatment which combines UASB,CASS with coagulation was presented. The UASB anaerobic reactor is used to remove most of the wastewater containing organic carbon as a pretreatment. Then, CASS aerobic treatment equipment is presented to dislodge organic carbon left and materials such as nitrogen and phosphorus as a secondary process. The coagulation process combined with UASB and CASS was applied to eliminate the residual organic matter in waste water and make the emission up to the standard finally. The UASB-CASS-Coagulation treatment was applying in a certain starch factory and the results show that the proposed method has higher efficiency compared to traditional treatment of cassava starch wastewater. It can directly bring environmental benefits by reducing emissions and economic benefits by recycling methane and yellow pulp. So it has a wider application prospects, and can be popularized easily.

Abstract: Selected reducing agents were applied to cotton knitting dyeing with C.I. sulfur black 1, and followed by acid cellulase treatment. The K/S value, fuzz removal rate, sulphurs content of fabric and COD value of the residues was measured to evaluate the cellulase performance. The results show that minimum sulphur content detected when glucose was used as reducing agent, which exhibited maximum fuzz removal, whereas maximum sulphur content detected when sodium sulfide was used as reducing agent, which gave minimum fuzz removal. It is concludes that ecological sulfur black dyeing with sulphur-free reducing agent could decline the suphur content in the fabric and promote cellulase performance.

Abstract: A two stage bioreactor was employed in bioremediation study of laboratory simulated brewery wastewater. Two weeks anaerobic dark incubation of the artificial brewery wastewater without external seeding resulted in an effluent with 138mgl-1VFA; the chemical oxygen demand decreased from 10,000 to 7,814mgl-1 total nitrogen and total phosphorus recorded 18.63 and 18.95% reductions. Further treatment of the anaerobic effluent with a photobacterium named Z08, reduced both the pollutants (COD, TN, TP) and high energy molecules (VFA) significantly by 36.8, 67.5, 27.0, and 60% respectively. Addition of 200mgl-1 NH2-CO-NH2 to the effluent yielded the best result, reducing COD, TN, TP and VFA by 67.5, 68.9, 34.2 and 82%.

Abstract: Bioremediation as a strategy of clean- up of crude oil spills in water using a mixed microbial population of E. Coli, Aspergillus niger, Penicillum notatum and Pseudomonas aeruginosa was investigated in this study. The sample of crude oil polluted water containing the mixed microbes and the control was monitored for parameters such as BOD, pH, Total Hydrocarbon Content (THC) and Turbidity over a period of nine weeks. At the end of the bioremediation period, the results obtained showed that the sample remediated with the mixed microbes gave a THC drop from 14975mg/l -1.960mg/l (99.9% drop) compared to the control with a drop from 14975 – 18.72mg/l (99.8% drop). A BOD drop from 1447.4mg/l – 17.1mg/l (98.8% drop) for the sample mixed microbes and 1447.4 – 90.8mg/l (93.7% drop) for the control. Turbidity values increased from 5.0 NTU – 25.2NTU for sample with mixed microbes and 5.0 NTU – 23.1 NTU for the control. The values of THC (1.96 mg/l) and BOD (17.1 mg/l) at the end of the experimentation period fell within the FEPA and DPR limits of 10mg/l and 30mg/l for THC and BOD respectively.The results above thus indicates that the use of mixed microbial population of Pseudomonas aureginosa, Penicillium notatum, E. Coli and