Reasearch On Optimization Of Integrated A/O Process For Carbon Removal And Deodorization And Its Microbial Community Structure

the monosodium glutamate wastewater, yeast liquor wastewater, molasses wastewater, citric acid wastewater, antibiotic wastewater, starch wastewater and other industrial waste water not only contains a high concentration of organic matter, but also contain different concentrations of sulfate. These industrial wastewater usually treated by the anaerobic methods or the anaerobic-aerobic oxygen ways for processing. But they usually produce odors such as hydrogen sulfide, which affect the environment health greatly. In trials, we found that use of integrated A/O reactor dealing with high concentration organic wastewater can effective removal stink material. However, most integrated A/O systems which have been developed are not implemented in an industry setting but only in a laboratory, bench or pilot scale because of the immatureness now. So we need further study about the integrate A/O systems.In this experiment an integrated A/O reactor was used to inspect the integrated A/O reactor synchronous carbon removal and deodorization function. After a successful start period, two parameters: sulfur carbon ratio (COD/SO₄^2-) and alkalinity on the integrated A/O in stable operation period were emphasized to investigate the synchronous carbon removal deodorization function and their influence on integrated A/O reactors in synchronous carbon removal and deodorization to make sure the best conditions of these two parameters for this reactor. We also investigate the microbial community in the integrated A/O reactors in different conditions and periods, which has the purpose of check the good conditions from essentially.The influence of two ways on start-up, not doing sulfate and keep COD/SO₄^2-at 5:1, were investigated. The result showed that two kinds of start way both can achieve quick start, but not dosing sulfate has higher COD removal efficiency (about 99%) than keeping c COD/SO₄^2- at 5:1 (about 96%).After the successful start-up, the two parameters, carbon/sulfate ratios and alkalinity were changed respectively to investigate simultaneous carbon removal and deodorization effect of the integrated A/O reactor. The results showed that the COD removal efficiencies were reached 96.5%, 95.1% and 96.2% at the carbon/sulfate ratios of 30:1, 10:1, 5:1, while the COD removal efficiencies were reached 87.5%, 87.9% and 89.3% at the alkalinity of 800 mg/L, 2000 mg/L and 4000 mg/L. The COD removal efficiency is higher when the carbon/sulfate ratio is 30:1 than when the carbon sulfate ratios are 10:1 and 5:1. The COD removal efficiency is higher when the alkalinity is 4000mg/L than when the alkalinities are 2000mg/L and 800mg/L.Changing alkalinity and carbon has no obvious influence on deodorization of this integrated A/O reactor. The sulfide in the liquid and H2S in the gaseous produced in anaerobic zone were no detected after treated by the aerobic zone of integrated A/O systems. The trial also checked of the microorganism communities of reactor system by the DGGE means, and found that the microorganism existing in the reactor is Firmicutes and Proteobacteria; the deodorization microbes in this reactor are Pseudomonas and Xanthomonas.