稻壳-粉煤灰混合吸附剂对沼液氮磷的吸附  

Adsorption of nitrogen and phosphorus onto fly ash and rice hull mixture from anaerobic fermentation slurry

作　　者：刘春力[1,2] 张帆[1,2] 朱建航[1,2] 李燕[3] 

机构地区：[1]南昌大学环境与化学工程学院,南昌330031 [2]南昌大学低碳生物技术研究中心,南昌330031 [3]南昌大学生命与食品科学学院,南昌330029

出　　处：《安全与环境学报》2014年第6期178-184,共7页Journal of Safety and Environment

摘　　要：以稻壳-粉煤灰为混合吸附剂吸附沼液中的氮磷,考察了混合吸附剂组分质量比、吸附剂量、吸附时间、初始氨氮质量浓度和p H值对吸附效果的影响。结果表明:在沼液中PO3-4-P和NH+4-N初始质量浓度分别为36.4 mg/L和88.2 mg/L、稻壳粉和粉煤灰质量比为3∶7、混合吸附剂投加量为50 g/L、吸附时间180 min、p H=8.3时,沼液中PO3-4-P的去除率达90.5%,NH+4-N去除率达70.6%,COD去除率达29.7%,PO3-4-P、NH+4-N和COD的吸附量分别为0.6588 mg/g、1.245 mg/g和1.356 mg/g。The paper is concerned about our investigation of the removal effects of the mixture of fly ash （FA） and rice hull （RH） on the ammonia nitrogen and phosphate from anaerobic fermentation slurry under varied conditions and influences, such as the mass ratio, adsorbent dosage, adsorption time, the initial concentration of ammonia nitrogen and pH value. The results of our experiments and investigation show that the removal rates of the mixture for the PO3- - P, the NH4 - N and the COD are as high as up to 92.4%, 70.6% and 29.7% respectively under the optimized conditions. The adsorption efficiencies of the mixture for PO43 - - P, NH4＋ - N and COD are 0.658 8 mg/g, 1.245 mg/g and 1.356 mg/g, respectively, when the initial concentrations of PO43- - P and NH4＋ - N are 36.4 mg/L, 88.2 mg/L, whereas that mass ratio of FA and RH, the mixture dosage, the adsorption time, pH are 3：7, 50 g, 180 min and 8.3. The removal rates of FA, RH and the mixture dosage to PO43- - P and NH4＋ - N prove that the removal rate of the mixed dosage is the best, followed by the FA, with the RH being the worst. The optimal pH for the removal effect of PO43- - P and NH4＋ - N is 8.0 - 9.0. When 1 - 10 g of the mixture adsorbent dosage added to the 100 mL fermentation slurry, with other conditions unchanged, the removal rates of PO43 - - P and NH4＋ - N are expected to increase with the increase of the mixture adsorbent dosage by taking the adsorption unit as the hybrid adsorbent, and decrease with the increase of the amount of the adsorbent dosage. However, when the initial concentrations of PO43- - P and NH4＋ - N are 3.64 - 72.8 mg/L and 22.05 - 441.0 mg/L, respectively, the removal rates of PO43 - - P and NH4＋ - N tend to decrease with the increase of the initial concentration. In addition, the said mixture proves to have a strong removal effect on the ammonia nitrogen and phosphate from anaerobic fermentation slurry for its improvement as compared with the added, individually. The working mechanism of the adsorption can be

关 键 词：环境工程学 粉煤灰 稻壳 氨氮 磷酸根 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]