| 摘要 |
<p>Controlling the metering of carbon-source addition to the denitrification step of a waste water purification plant can be achieved by monitoring the methane concentration in the exhaust gas of the denitrification step and controlling the carbon-source feed in such a manner that the methane concentration in the exhaust gas remains at / 0.03% and in particular in the range from 0.2-0.4%, especially 0.2-0.3%. The redox potential in the effluent of the denitrification step is expediently additionally monitored and, if desired, kept at values in the range from -340 to -470 mV by additional carbon-source-feed control, the carbon-source feed being preferably spontaneously released if the redox potential exceeds -100 mV. An apparatus suitable therefor includes a methane metering device connected to the gas space of the denitrification and a metering regulator in the carbon-source feedline to the denitrification step, which controls the feed in proportion to the deviation from the set point determined by the methane measurement, and, if required, a redox potential measurement probe connected to the metering regulator and arranged in the effluent of the denitrification step, whose signal is passed to the metering regulator as an additional control parameter for the carbon-source feed. <IMAGE></p> |
