Method for Rapid Labeling of Waste Sludge from a Food Factory with ¹⁵N-Glycine and Evaluation of N Use Using Komatsuna (Brassica rapa Var. perviridis)

Figure 3

The changes of temperature in the reactor during composting of WS-PM. The waste sludge from a bean curd factory was mixed with newspaper chips as described in Figure 2, and the temperature of the reactor was monitored as described in Sections 2.2 and 2.3. On day 7, indicated with a broken line arrow, the aeration was ceased, and the WS-PM in the reactor was collected and replaced again after the thorough mixing of the sludge to check the subsequent 2^nd composting reaction. After setting the remixed WS-PM, aeration was started with the same condition as those in the first aeration. The broken line ---, the solid line –, and dotted line ···· represent fluctuation of the temperatures at depth of 10 cm, 40 cm, and 70 cm, respectively, from the surface of the mixture in the reactor.