Yuan L.,Xi'an University of Architecture and Technology |
Li J.,China Jikan Research Institute of Engineering Investigation and Design Co. |
Chai L.,Xian Jian Gong Da Tang Construction Project Management Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2015
Due to the lack of special designing model of sequencing batch reactor(SBR), the determination of basic parameters of the SBR has to depend on experience or refer to the design of continuous flow reactor in present, where its own characteristics of SBR has been ignored, resulting finally in some errors in the design. In order to solve the problem, the dynamic process of substrate biodegradation in different operation stage of the SBR treating synthesized domestic sewage was analyzed. Based on this, the dynamics models of substrate biodegradation were established according to anaerobic / anoxic (only mixing) stage and aerobic stage (aeration and mixing) of SBR operation. Selecting and determining method of the reaction kinetics' parameters were proposed and discussed. The model was validated by data of performance of the SBR. As a result, substrate biodegrading model in anaerobic/anoxic stage is as S =[a·Si+(1-a)·S0]·e-5.654×10-6 Xt and that in aerobic stage S =S0'·10-1.662 5×10-5Xt. The results calculated by the models are highly consistent with that of performance of the reactor. The models are considered to be helpful for designing SBR applied to domestic wastewater treatment. ©, 2015, Science Press. All right reserved.
Yu Y.,China Jikan Research Institute of Engineering Investigation and Design Co. |
Yu Y.,Xi'an University of Architecture and Technology |
Zhang J.,China Jikan Research Institute of Engineering Investigation and Design Co. |
Zheng J.,China Jikan Research Institute of Engineering Investigation and Design Co. |
And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015
The calibration test was carried out to improve the measurement accuracy of the standing-wave ratio(SWR) sensor. The effect of dry density, structure properties and soil texture on soil-water content measured with the SWR sensor was explored. The mathematic correction models were established on the basis of the measured soil-water content of Q3 loess and paleosol with the SWR sensor and the oven-drying method. The use of the factory-supplied parameters resulted in an overestimation of soil-water content compared to the one measured with oven-drying method. The effect of the variation of dry density on the measurements of sensor should not be neglected. The correction model of soil-water contents for SWR sensor was established considering the effect of dry density. The corrected results with the model were proved better than those based on the cubic fitting equation of regression analysis between θv and θw determined in the laboratory. When the volumetric water content was in the range of 9.2% to 39.9%, the adjusted soil-water content was within 2%. While the volumetric water content was 39.9% to 46.3%, the adjusted soil-water content was within 3%. No statistically significant difference of soil-water contents was observed between the undisturbed and the remoulded samples. There were notable differences between the loess and the paleosol in soil texture and therefore the corresponding calibration models should be established separately. ©, 2015, Academia Sinica. All right reserved.