Performance Of Micro-aerobic EGSB And SBR-MBBR Process For Treating Traditional Chinese Medicine Residue Dehydration Wastewater

The modern industry of traditional Chinese medicine develops rapidly,but the extraction technology of traditional Chinese medicine processing industry in China is often relatively simple,the extraction efficiency is low,and the yield of Chinese medicine residue is huge.At present,the main disposal methods are landfill,incineration,fertilizer,etc.,resulting in the waste of resource materials in the residues,so the high-value utilization mode of the residues has been widely concerned.However,due to the complex composition and high content of organic pollutants in the front-end dehydrated waste water by high-value treatment,it is difficult for the conventional wastewater treatment process to meet the increasingly strict discharge standards.Therefore,it is of great practical significance to study the process system with high efficiency and low consumption for realizing the whole-process control of water pollution in the treatment of solid waste of traditional Chinese medicine.In this paper,the combined process of micro-aerobic EGSB and SBR-MBBR was proposed to treat the dehydrated wastewater from Chinese medicinal residue.Micro oxygen EGSB reactor for anaerobic mode,start in return increase after the completion of aeration,domestication and anaerobic granular sludge,and gradually explore different organic load,hydraulic retention time and aeration intensity of the sewage treatment effect and effluent organic matter composition and anaerobic microbial community diversity in EGSB bacterial colonies,the law of succession and the core function.The MBBR reactor is operated in SBR mode,and the combination of EGSB and MBBR processes is used to improve the wastewater treatment efficiency.The influence of different dissolved oxygen levels in aerobic section on the pollutant treatment efficiency of SBR-MBBR is focused on,and the stability and applicability of the continuous operation of micro-oxygen combined process of EGSB and SBR-MBBR for the treatment of Chinese medicinal residue dehydrated wastewater is investigated.Micro-aerobic EGSB start-up and stable operation of 220 consecutive days,anaerobic VFAs start early and gas rate shows that in the start stage,the change rule of EGSB reactor microbe is complete with anaerobic digestion features,after 49 days anaerobic startup is adjusted for micro-aerobic run,under the condition of anaerobic methanogenesis activity is reduced,the water VFAs maintain in low concentration;With the increase of organic load,VFAS concentration accumulated to a certain extent,and methanogen activity recovered to a certain extent.The maximum COD removal rate of92.19±5.02(%)can be obtained.After shortening HRT and increasing load,the COD removal rate can be stabilized at 87.00±0.82(%).Microbial diversity analysis showed that Bacteroides,Macellibacteroides,Petrimonas and other bacteria related to hydrolysis and fermentation were significantly enriched under micro-aerobic condition,which indicated that micro-aerobic condition could effectively promote the enrichment and growth activity of facultative microorganisms,and might stimulate the release of extracellular enzymes.Substrate hydrolysis and removal are thus enhanced.Two groups of MBBR with different dissolved oxygen levels were started and operated in SBR mode,and the two groups of SBR-MBBR and micro-oxygen EGSB were combined to run for 50 days.The experimental results show that the combined operation of micro-oxygen EGSB and SBR-MBBR can effectively improve the wastewater treatment efficiency,completely remove the characteristic pollutants such as glycyrrhizin and glycyrrhizic acid,reduce most of the organic load in the micro-oxygen EGSB section,and realize the deep treatment of organic matter in the SBR-MBBR.The effluent water quality meets the discharge limit of "Water Pollutant Discharge Standard for Pharmaceutical Industry of Traditional Chinese Medicine(GB21906-2008)".In this paper,the combined process of micro-oxygen EGSB and SBR-MBBR can effectively treat the dewatering wastewater of Chinese medicine residue and reach the standard stably,which provides a theoretical basis for the pollution control of the whole process of solid waste recycling of Chinese medicine and has a good practical application.