《Table 5–The average value of ORP in the inner areas of saran lock carriers along their thickness du

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《Pilot-scale experiments on multilevel contact oxidation treatment of poultry farm wastewater using saran lock carriers under different operation model》

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Further，the saran lock carriers also provided a threedimensional spiral structure，which differed from the function of the anoxic–aerobic interspace on the surface of each part of the carriers.The oxidation–reduction potential（ORP）was applied to reveal the internal environment of the carriers and shown in Table 5.The results revealed that，along the direction of the thickness of the carriers，the ORP decreased significantly from the outlier to the center，where an apparent anoxic-aerobic interspace was possibly formed during the framework of the carriers.That is to say，the inner environment of the carriers is similar to the anoxic-aerobic interspace of the biofilm.The concentrations of CODcr，ammonia，NO3-，total nitrogen，and the DO were distributed as specific law.However，known from the biofilm，granular sludge or the sludge flocs，the mass transfer among the saran lock carriers is via the flowing liquid.The water loaded with varies kinds of nutrients can flow at will in every space of the carriers，which can easily transfer the nutrients，especially for the COD and nitrate，to the anoxic section.The thickness of the carriers is as high as 60 mm，more than ten times of that of biofilm，which could provide a stable and vast anoxic section under the outlier aerobic environment.This conclusion is similar to the pervious study that a three dimensional spiral structure was provided by the spiral biological carriers to enhance the SND process when a four-level contact oxidation process was applied to treat the brewery wastewater（Zheng et al.，2015b）.