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悬浮物含量高是沼液在使用滴灌或膜浓缩处理过程中最主要的技术障碍,因此,如何去除其中的悬浮物是保证沼液能否更好后续资源化利用的关键。为了探索玉米秸秆作为一种预过滤材料对猪粪发酵沼液的过滤效果,通过将玉米秸秆按不同粒径、不同填充方式进行装柱,测定过滤前后液体的悬浮物(SS)、p H值、电导率(E_C)、化学需氧量(COD)、总氮(total nitrogen,TN)、总磷(TP)、总钾(TK)等指标的变化,比较玉米秸秆在不同装填方式下的综合过滤能力。滤柱的运行条件设置为:内径10 cm,装填高度85 cm,沼液进水流量5 L/h。结果表明,上粗下细玉米秸秆自然堆放(JG50+JG20)在单周期总运行时间、单周期总处理水量以及悬浮物(SS)的去除方面均有较好的表现,其中,单周期总运行时间可达到10~14h,单周期总处理水量为56.65 L,SS去除率可达到60%以上,COD去除率在50%左右。沼液中的氮素主要分布在液相中,过滤后TN的去除率约为10%~15%。玉米秸秆作为过滤材料,在过滤过程中沼液可将其中的K+浸提溶出,提高滤出液的养分含量,且滤出液K+与EC具有高度相关性,相关系数>0.8。该实验验证了玉米秸秆作为沼液预过滤材料的可行性,并为后续进行精密过滤、组合过滤提供了参考。
The high content of suspended solids is the most important technical obstacle in using biogas slurry in drip irrigation or membrane concentration treatment. Therefore, how to remove the suspended solids in it is the key to ensure that biogas slurry can be used for better subsequent resource utilization. In order to explore the filtration effect of corn stalks as a pre-filtration material on the fermentation of biogas slurry from pig manure, the column was used to pack the corn stalks with different particle sizes and different filling methods. The suspended solids (SS) and p H (E_C), chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), total potassium (TK) and other indicators of corn stalks were compared under different loading methods Filtering ability. The filter column operating conditions were set to: 10 cm in diameter, filling height of 85 cm, biogas slurry inflow 5 L / h. The results showed that JG50 + JG20 had better performance in total cycle time, single-cycle total treatment volume and suspended solids (SS) removal. Among them, the single-cycle total operation Time can reach 10 ~ 14h, single cycle total treated water is 56.65 L, SS removal rate can reach more than 60%, COD removal rate is about 50%. Nitrogen in biogas slurry is mainly distributed in the liquid phase, and the TN removal rate after filtration is about 10% -15%. Corn stalks were used as filter material, biogas slurry could be leached out and leached by the biogas slurry in the process of filtration, and the nutrient content of the filtrate was increased, and the filtrate K + was highly correlated with EC with a correlation coefficient> 0.8. This experiment verified the feasibility of using corn stalks as biogas slurry prefilter and provided a reference for the subsequent precision filtration and combination filtration.