Start-up Of Micro-pressurized Fluidized Hybrid Biological Reactor And Study On The Efficiency For Treating Phenolic Wastwater

In order to reduce investment and operating costs and increase running stability of sewage treatment, then extendly used in the industrial wastewater treatment, Wenhua Zhang design of a micro-pressurized fluidized hybrid biological reactor (MP-FHBR) as the core of the new type of highly efficient complete water treatment technology and equipment.In this paper, using artificial phenolic wastwater to test and study on the micro-pressurized fluidized hybrid biological reactor (MP-FHBR) in the laboratory. Experiments include: debugging and start up MP-FHBR, study on the efficiency of MP-FHBR for treating phenolic wastwater, the process of removing of phenol and study on the reason for efficient degradation of phenol in the MP-FHBR. Efficiency of MP-FHBR for treating phenolic wastwater is the key of this study. Through more than 8 month of dynanmic experiment, this article has studied the effect of volumetric load to the quality of the effluent and settling velocity of sludge, the influence of inflow rate on the sedimentation effect, the relations between HRT and the phenol removal rate. And through research the influence of different phenol concentrations to the microbial degradation phenol, as well as the elimination process of phenol in MP-FHBR, the partly reason that phenol can be highly effective removed in the MP-FHBR has be explained.MP-FHBR as a new type of bioreactor, the technology have not yet reported at home and abroad to date. The experiment was carried out the first small-scale testing and research, experimental data will serve as the basic date to improve and optimize the design and operation parameters in the pilot and the subsequent practical application.The results of debugging and start up the MP-FHBR showed that:⑴continuous sludge return can guarantee the stability of sludge concentration, on the other hand, will return to a mixture of sludge and water to the mixture of mud and water form through the inlet into the reaction pool, which is equivalent to increasing the intake of water and reduce the concentration of water, which is conducive to the spread of pollutants in water and the reaction mixture of activated sludge tank, thereby speeding up the process that pollutants be adsorbed and degradated by the sludge.⑵by controlling the three perforated aeration tube gas flow rate can be achieved on the reaction pool solid - liquid - gas phase flow system in the control of the pool in response to the formation of a gradient of dissolved oxygen.⑶Under the conditions of 20℃-30℃temperature range, temperature is no significant impact on the removal rate of phenol in the MP-FHBR.⑷MP-FHBR sedimentation tank sludge bed is an important factor for reactor stable operation. Height of Sedimentation tank sludge bed of the reactor mainly determined by inflow rate, sludge concentrations and settling velocity of sludge.⑸Micro-organisms which domesticates can quickly adapt to the environment in the MP-FHBR and can be highly efficient removal of phenol in waste water.⑹After a period of time to run, sludge can form a static sludge layer in the MP-FHBR sedimentation tank. Due to its strong filtering effect, it can significantly improve the water separation efficiency of MP-FHBR sedimentation tank, thus can reduce suspended solids of the effluent.The results of studying the efficiency of MP-FHBR for treating phenolic wastwater showed that the organic volumetric loading and phenolic volumetric loading of MP-FHBR could reach to 4.86kgCOD/m3·d and 1.96kg phenol/m3·d, respectively, COD of effluent were less than 200mg/L, phenol concentrations of effluent were less than 1mg/L, the COD removal efficiencies were above 90%, and the phenol removal efficiencies were above 99%. When the phenolic volumetric loading reach 2.04kg/m3·d, in the reactor, phenol cumlated gradually and the specific TTC-dehydrogenase activity decreased. When the organic volumetric loading were 3.14～4.86kgCOD/m3·d, settling velocity of sludge is better. When phenol concentration of influent was 800mg/L, the optimun HRT was 9～10h. Because the influence of inflow rate on the sedimentation effect of sedimentation tank constraint on the inflow rate of the reactor, MP-FHBR was superior to treating high-concentration phenolic wastwater.The results of studying the process of removing of phenol and the reason for efficient degradation of phenol in the MP-FHBR showed that:⑴With the increase in phenol concentration of phenol used in this experiment the activated sludge to enhance the inhibitory effect of phenol degradation, and when the phenol concentration at 350mg/L, the inhibitory effect of phenol significantly enhanced.⑵MP-FHBR can efficiently remove the phenol in waste water, partly because of continuous water flow. when the phenol volume load in less than 1.96kg phenol/m3?d, the concentration of phenol of the system has always been at a low level. This will avoid the phenol concentration being at a higher level in the system, and thus avoid reducing capacity of the microbial for degradation of phenol.⑶When the MP-FHBR overload , the system has a certain impact on the capacity of the load resistance. When phenol cycle and accumulated to a certain concentration in the system, due to the high concentration of phenol on microbial inhibition, the ability of reactor for removing of phenol will significantly reduced, resulting in the phenol concentration in effluent became significantly higher.