1.Yunnan normal university;2.Yunnan Normal University
Industrial Technology Leading Talent Project of Ten Thousand Talents Plan of Yunnan Province (20191096); Science and Technology Development Program of Jilin Province (20200402099NC, 20200403010SF); International Science and Technology Cooperation Special Project of Yunnan Province (202003AF140001).
以多级好氧折流沟串联沉降装置为基础，最大限度地保留沼液中氮素养分的同时，去除沼液废水中悬浮物。根据材料静态条件下等温吸附及解吸率结果，筛选氨氮低吸附填料，接着在动态条件下考察好氧折流沟内填料深度及运行时间对沼液中悬浮物去除效果与氨氮浓度的影响。结果显示，在人工沸石、河砂、石英砂和沙漠砂四种材料中，河砂的吸附强度、吸附指标及解吸值最低。选取河砂作为动态好氧折流沟填料，在水力负荷0.75 L/h、滞留时间24 h条件下，无填充、低填充、中填充及高填充对沼液废水中悬浮物最大去除量分别为4.8 g/L、5.1 g/L、8.1g/L和8.4g/L，最大去除率分别为38.0%、51.2%、86.1%和88.7%，而中、高两种填料深度对沼液废水中悬浮物去除量及去除率在第三、四取水口处无明显差异性（P＞0.05）。介于应用中材料选取、用量及去除效果比较，河砂填料对沼液废水中氨氮浓度影响最小，建议采用河砂中填料深度的好氧折流沟处理沼液中悬浮物。
Based on the multi-stage aerobic baffle ditch series sedimentation device, it can retained to the maximum extent of ammonia nitrogen in biogas slurry and suspended matter in biogas slurry wastewater can be removed. According to the results of isothermal adsorption and desorption rate of materials under static conditions, the low adsorption filler of ammonia nitrogen was screened, and the effects of depth of filler and running time in the aerobic baffle ditch on the removal efficiency of suspended solids and the concentration of ammonia nitrogen in biogas slurry were investigated under dynamic conditions. The results showed that the adsorption strength, adsorption index and desorption value of river sand were the lowest among artificial zeolite, river sand, quartz sand and desert sand. River sands were selected as the filling of dynamic aerobic baffle ditch. Under the hydraulic load of 0.75 L/h and retention time of 24 h, the maximum removal of suspended solids in the biogas slurry wastewater by no filling, low filling, medium filling and high filling were 4.8 g/L, 5.1 g/L, 8.1 g/L and 8.4 g/L, respectively, and the maximum removal rates were 38.0%, 51.2%, 86.1% and 88.7%, respectively. There was no significant difference in the removal amount and removal rate of suspended solids in the biogas slurry wastewater between the medium and high filler depths at the third and fourth water intakes (P > 0.05). Considering the comparison of material selection, dosage and removal efficiency in application, river sand filler had the least influence on concentration of ammonia nitrogen in biogas slurry wastewater. Therefore, it is recommended to use aerobic baffled ditch with the medium filling depth of river sand to treat suspended solids in biogas slurry.
罗志伟,刘建峰,王昌梅,赵兴铃,吴凯,尹芳,梁承月,张无敌. 基于氨氮低吸附的折流式沉降滤过装置去除沼液中悬浮物研究[J]. 农业现代化研究, 2022, 43(2): 360-368
LUO Zhi-wei, LIU Jian-feng, WANG Chang-mei, ZHAO Xing-ling, WU Kai, YIN Fang, LIANG Cheng-yue, ZHANG Wu-di. Research on removal of suspended solids in biogas slurry by baffled settlement device based on low ammonia nitrogen adsorption[J]. Research of Agricultural Modernization, 2022, 43(2): 360-368