Papers by Keyword: Wastewater Treatment Process

Abstract: In the wastewater treatment process, it is necessary to detect the concentrations of organic matter in order to monitor the operation and adjust the process parameters. Based on fluorescence excitation-emission matrix spectrometry, Chemical oxygen demand (COD) of effluent wastewater in the primary sedimentation tank, the secondary sedimentation tank and the final sedimentation tank of Hengdian Wastewater Treatment Plant, Zhejiang Province, is detected respectively based on fluorescence excitation-emission matrix spectrometry. In order to compare the modeling performance, principal component regression (PCR), partial least squares (PLS), parallel factor analysis (PARAFAC) and multi-way partial least squares (N-PLS) are respectively used to build the calibration models between the fluorescence spectrometry and COD. Experimental results show PLS is better than PARAFAC and N-PLS in the aspect of modeling performance for detecting COD in the wastewater.

Abstract: The combustion properties of five different sewage sludges were studied by thermal gravimetric analysis in the atmosphere of “oxygen”and “nitrogen + oxygen”, respectively. The results indicate that there are not influence of wastewater treatment process and the sludges anaerobic digestion on the combustion process, but both of the “anaerobic” wastewater treatment and the sludge anaerobic digestion make the ignition temperature of sludge higher, and the temperature of anaerobic digestion sludge is the highest. The relationship among the ignition temperatures of five sludges is independent of combustion atmosphere and heating rate. However, low heating rate makes the temperature of sludge decline. The combustion reaction mechanisms have been studied with Šatava-Šesták equation. It shows that there are the same combustion reaction mechanisms for five sludges in the same atmosphere, and the heating rate hasn’t influence on them, but the combustion atmosphere has influence on them.