| Title |
The Development of Estimation Model for Iron Compound Originated from Anaerobic Microbial Corrosion |
| Abstract |
In this study, estimation model for iron compound originated from upflow, anaerobic fixed bed reactor, which treats sewage domestic wastewater, was developed. The estimation model was formulated by a mathematical expression which was based on the mass balance. Below the HRT of 60 minute, sulfide concentration combining with iron FeS_2 is the highest because the maximum sulfate consumption rate V_maxs and half-saturation constant of sulfate K_ms exert an important effect on the estimation model as temperature was increased. But increment of FeS_2 concentration is weakened above the HRT of 60 minutes and represent the lowest value at the HRT of 108 minutes, It implies that liquid phase distribution ratio of sulfide αr becomes lower as temperature was increased, While phosphorus concentration combining with iron Fe_3(PO_4)_3 is increased as HRT and temperature are increased, which is affected by phosphorus removal rate constant k_p. As the result of estimating the iron concentrations of corrosion by the model, the concentration of iron corrosion is higher than any other at the HRT of 108 minute and 20℃. The predicted values were compared with measured ones at different HRT(13.5, 27, 54, 108 min) and temperature(20, 25, 30℃). The experimental data could be fitted with the simulated curves. Therefore, the mathematical expression could be applicable to design full-scale wastewater treatment plants. |