No full-text available
To read the full-text of this research,
you can request a copy directly from the authors.
Hydraulic characteristics and influence factors about short-cut nitrification of continuous aerobic granule reactor
Abstract
To study the hydraulic characteristics of the continuous aerobic granule reactor and the effecting factors of nitrification, NaCl solution was emptied into the reactor as the tracer to testify the specific conductivity of water. Hydraulic experiment results showed that the flow pattern of the reactor was plug flow which was not ideal. The single factor test was conducted with temperature, pH, dissolved oxygen, ratio of carbon and nitrogen, hydraulic retention time. Then orthogonal experiment was studied with the optimal method. The results show that the factors influencing short-cut nitrification are pH, temperature, hydraulic retention time, dissolved oxygen and ratio of carbon and nitrogen. The optimal factors combination is that pH = 8.0, t = 29°C, DO = 1.0 mg/L, HRT = 15 h, C/N = 5. Under this conditions the reactor rans for one month. The average accumulation of NO2--N/NOx--N exceeds 90%. The removal efficiency of ammonia nitrogen and COD are more than 85% and 90%.
The successful cultivation of aerobic granular sludge with outstanding performance in airlift aerobic granular sludge bed reactor (AGSB) which was inoculated anaerobic granular sludge and aerobic flocculent sludge was performed using a synthetic wastewater mainly consisted of glucose as carbon source. The diameters of the granules ware 0.5-2.0 mm and the sludge concentration in the reactor was in 5 g/L or so. As the influent COD of 2000 mg/L and the COD loading of 4.8 kg/(m3·d) were employed, COD removal synthetic maintained more than 96%. Through the scanning electron microscopy observation, aerobic granular sludge was layered structure with a large number of filamentous bacteria winding on the surface, and some short bacillus and holes existing inside. After 47 days of cultivation, when the pharmaceutical wastewater completely replaced the synthetic water with gradually the increased pharmaceutical wastewater in the ratio of water, the COD, NH3-N, TP removal synthetic were more than 90%, 90%, and 70% respectively.
This study investigated the control of several major single factors influencing nitrosification, including hydraulic retention time (HRT), dissolved oxygen (DO), pH, temperature, carbon-nitrogen ratio (C/N), on denitification of livestock wastewater under a continuous flow operation mode, in order to achieve stable shortcut nitrification-denitrification by immobilized activated sludge particles. The results show that the removal rates for TN were 81.98%, 87.32%, 83.82%, 85%, and 85.37%, respectively, for a single factor (HRT) of 10 h, dissolved oxygen of 4 mg/L, pH value of 8.5, temperature of 30°C and carbon-nitrogen ratio of 10.While those for COD were 93.79%, 98.35%, 93.93%, 97%, and 97.28%, respectively under the same conditions. The outcome of this study suggests that the removal efficiency of this technology is satisfactory.
ResearchGate has not been able to resolve any references for this publication.