Study Of Sulfate Organic Wastewater Treatment In Light Anaerobic Microecological System

As the common industrial wastewater, sulfate wastewater has numerous sources andgreat harmful to humans. There have many shortcomings in traditional physicochemicaland biological treatment processes. In this paper, a novel process which add lightcondition in the traditional anaerobic treatment processes has been presented, and thenon-illuminated condition as comparative experiments. The COD, SO42-, pH of theeffluent and changes of reactors were detected in the initial and changed conditionsoperational phase. The biofacies of granule sludge were observed by SEM-EDS,furthermore, the proliferation and index of sludge were analyzed.In this study, the domestication of mature granular sludge was used as the seed sludge.Initial operation phase, using a phased approach to enhance the load, run to28days, CODand sulfate removal rate of each reactor remained stable. Illumination reactors andnon-illuminated reactors’ COD removal rate are about85%~90%and60%~70%,respectively. Effluent pH are7.5~8.0and7.5~8.0, respectively. Besides, the SO42-removalrate of each reactor is almost, surpassing90%. It showed that, in different conditionoperational phase, the COD removal rate of each ractor which with overflow circulationloop is slightly higher than which without. When COD/SO42-is5:3, COD removal rate issignificantly lower than that are5:2and4:1, meanwhile, sulfates removal rate is lowerthan that COD/SO42-ratio is4:1, obviously. COD and sulfates removal rate are dropedvisibly when illumination time from more than12h to6h. COD removal rate significantlyreduced when temperature was40℃, however, sulfates removal rate of35~40℃isslightly higher than25~30℃. It indicated that, add overflow recycle, COD/SO42-ratio of4,more than12hours illumination time and temperature of30~35℃are a the suitableconditions for the experimental system. Detection results showed that the maincomponents of the reaction gas are methane, carbon dioxide.After a period of running time, the color of light reactors went to red, and there hadwhite-yellow solid substance generated. After SEM-EDS analysis on the light-yellowsolid product, basically concluded that this material is sulfur. Granule sludge biofaciesanalysis results showed that, bacillus and sphaerophorus are the mainly bacteria in the sludge, in addition, there have some spirillum and filamentous bacteria. Furthermore, itformed zoogloea of granule sludge in the light condition. The results of sludgecharacteristics analysis showed that the sludge growth rate in light conditions are fasterthan the non-light conditions, moreover, the sludge in light conditions are superior tonon-light conditions. This article concluded that the light is conducive to pollutantremoval and system stability.