PCBs removal in the aged leachate by a new combination process, combined coagulation with a two-staged sequencing batch biofilm reactor with Luffa Sponges (LS) as the biomass carriers (LS-SBBR), was studied in this research. The results indicated that the removal rate of total PCBs in the aged leachate was 51.97%, and it was achieved mainly by the removal of trichlorobiphenyls, the PCBs contents in sludge in the two-staged LS-SBBR were consistent with the conclusion that the PCBs removal in liquid phase of the second LS-SBBR was higher than that of the first LS-SBBR.
Nowadays, the immobilization of At.t is a research potential. The immobilization of At.t on the sawdust filler was discussed in this paper. The experimental results indicated that sawdusts, as the immobilization fillers, can provide a stable living microenvironment for At.t showing the favorable bioactivity and strong acid-producing capacity. Also, under the optimal conditions with the inoculums concentration 12.5%, sulphur dosage 1% (w/v), dissolved oxygen (DO) in the bioreactor above 6 mg/l, the conductivity, pH, and H+ in the bioreactor were 45.2 ms/cm,0.964, and 0.109 mol/l,respectively. In the leaching ore experiment within 24 hours, bacteria effect of phosphorus removal was unconspicuous.
PCBs removal in the aged leachate by a new combination process based on an innovative biofilm reactor with natural fiber media, combined coagulation with a two-staged sequencing batch biofilm reactor with Luffa Sponges (LS) as the biomass carriers (LS-SBBR), was studied in this paper. The results indicated that the total PCBs removal in the aged leachate was 51.97%, and the PCBs removals are mainly achieved by the removal of trichlorobiphenyls, the PCBs contents in sludge in the two-staged LS-SBBR were consistent with the conclusion that the PCBs removal in liquid phase of the second LS-SBBR was higher than that of the first LS-SBBR.
By analyzing the feasibility of comprehensive utilization method of yellow phosphorus tail gas after desulfurized, the author of this article found only the method of heat energy utilization is technically more mature, practical and feasible. Taking a chemical plant in some Chemical co., LTD in Hubei for example, this article demonstrates that the complete and comprehensive utilization of yellow phosphorus tail gas could be achieved once various technical measures are planned as a whole and their configuration are optimized. The technical measures include replacing coal-fired boiler, using as polymerization heat source in fine phosphate production, stoving the materials of yellow phosphorus and burning chemical products and so on. Finally, this article put forward principles and requirements of the optimal configuration based on heat energy utilization of yellow phosphorus tail gas in fine phosphorous chemical enterprises.
Measure content of fresh tailing sand in a certain skarn type copper mine selection tailing sand warehouse, lead, cadmium, arsenic, nickel and zinc elements, etc in old tailing sand by ICP-AES. Carry out eluviations test of tailing sand and leaching test of tailing sand by horizontal vibration method and Sulphuric-Nitric acid method respectively. Discuss with phase constitution of harmful elements such as arsenic in tailing sand by XRD analysis chromatogram of tailing sand. Compare with content analysis result and mineral constitution of related elements in raw mine on the basis. Research migration and distribution disciplines of associated harmful elements in raw mine to tailing sand by floatation. Test result shows that arsenic, zinc, cadmium and lead elements in raw mine deeply concentrated in tailing sand after mine selection. Percentage is 96.89%, 92.0%, 91.65% and 41.12% respectively. Main existence form of As in tailing sand is FeAsS (arsenopyrite). It intergrowth with pyrite (FeS2); Zn mainly exists in a ZnS (sphalerite) form. Pb, Cd and As have migration trend from upstream to downstream of tailing sand warehouse and from shallow layer to deep layer. Dissolution rate of Cd, Cu, Zn, Cr and Pb under eluviation and weak acid leaching conditions is lower. However, they have release trend under acid conditions. Arsenic element is special as follows: It is undetected in various points during Sulphuric-Nitric digestion. However, tiny detection of fresh surface layer and deposit layer out of old tailing sand by horizontal vibration method prompts stability of arsenic tailing sand FeAsS and alarm of leaching activity under alkaline conditions. Cause of arsenic tailing sand FeAsS is that it is brought by raw mine without large destruction to FeAsS during mine selection process.
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