Study On The Performance Of The Integrated Anaerobic-aerobic Reactor Used For The Treatment Of Tea Polyphenols Production Wastewater

To solve the problems of applying the treatment technology to middle and high concentration organic wastewater: narrow applying field, occupying larger area, high investment and running fee, this paper firstly studied the treatment of high concentration organic wastewater by integrated anaerobic-aerobic reactor (IAOR) which was designed by our laboratory. Firstly, IAOR was firstly used for the prefabricated high concentration organic wastewater treatment. The impacts of temperature, OLR, HRT on treatment effect were also studied. The primary conclusions were: at 16~20 ℃the start-up is completed within 25 days. When operating at 20~28 ℃after 46 days, the hydraulic retention time (HRT), CODCr concentration of influent, volumetric organic loading rate (OLR) and CODCr removal rate of IAOR system had reached 20h, 13000mg/L, 13.2KgCOD/(m3·d) and 99%, respectively. This system was able to resist the impact load when OLR was lower than 20KgCOD/(m3·d) and HRT was higher than 14h. And it could run steadily at lower temperature. From the SEM pictures of bio-particles, we found the particles were very close to sphere, and there were a lot of microbes on the face of particles. It was proved that the IAOR adapted to the growth of microbe and could remove large quantities of CODCr. And the good foundation was set up for the treatment of Tea Polyphenols (TP) production wastewater. Secondly, Tea Polyphenols (TP) production wastewater was characterized by high CODCr, high TP and chroma, bio-toxicity, etc. We adopted the technics of flocculating pretreatment-IAOR to treat the TP production wastewater. By pretreatment we got that when the basic aluminium chloride was used to modifying celatom, the best quantity of basic aluminium chloride was 7 times of celatom to the 1.2 times diluted TP wastewater. When using the modified celatom to absorb the CODCr of the wastewater, the optimal conditions were: pH=8~8.5; the dosage=100mL; stewing time=30~40min. And under these circumstances the TP and chroma removal rate were 70% and 60%. After the pretreatment, the wastewater was sent into the IAOR system. During the running of IAOR system at 26~30 ℃, HRT was 20h and OLR was 6.5~20KgCOD/(m3·d). When the CODCr, TP and chroma concentration arrived 18000mg/L, 1360mg/L and 1000, it was found that these indexes'removal rate of the whole system were 96%, 99% and 94%, respectively. This system was capable to resist high impact load: when OLR was 7~17KgCOD/(m3·d), the CODCr removal rate of the system could keep around 98%; and when OLR went beyond 7~17KgCOD/(m3·d), the rate also was over 90%. From the SEM pictures of bio-particles, we found much deposit were accreted on the face of the particles of A and O parts. The particles were very close to sphere, but the quantity of microbe on the face of the particles was little than that in the holes. And the microbes'size was small.In these microbes there were some unacquainted types, besides Methanithrix sp., Methanosarcina, and bacilli. It was proved that this technics could remove large quantities of TP, CODCr and chroma.And it adapted to the treatment of the TP production wastewater. Thirdly, on the base of the experimental data and the Monod'equation, we simulated the curves and get the reaction kinetics of TP at the first time: A part, 0.4860.629dS SX? dt = + S; O part, ? ddSt = 3110..978491S+X S. These results proved that the IAOR system possessed many advantages such as high CODCr, TP and chroma removal rate, a short start-up time, strong anti-shock loading capability, fine outlet-water quality, easily to manage, occupying smaller area and investment. It adapted to treat the organic wastewater that had high CODCr, TP and chroma concentration and large fluctuation of wastewater character and flow. And the IAOR system had tremendous industrial foreground.