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针对目前流化床载体在生物挂膜过程中存在密度大、流态化能耗高、孔隙率低、亲水性及生物亲和性差、挂膜周期长等缺点,采用界面聚合发泡法制得亲水性聚合物多孔载体,通过接枝葡萄糖、掺杂粉末活性炭改善载体的亲水性及热稳定性能,研究了单体组成、催化剂、发泡剂用量与载体密度、孔隙率、吸水率的关系,并利用BET、FT-IR、TG分析表征了亲水性多孔载体孔结构及物化性能;并通过4种不同载体的生物流化床挂膜实验考察了载体表面特性对生物挂膜量、生物活性的影响,同时揭示亲水性聚合物多孔载体生物挂膜性能的机理.结果表明,制备体积1 L的亲水性多孔载体最佳组分为:聚醚三元醇用量50 g、TDI 20 g、葡萄糖7 g、粉末活性炭6 g、辛酸亚锡0.2 g、三亚乙基二胺0.4 g、发泡剂1.5g;所制备的载体具有表面亲水性及丰富的大、中孔结构,吸水率达到315.2%,孔隙率为91.7%;通过葡萄糖接枝、粉末活性炭掺杂增加了亲水性基团羟基及载体的吸附性能,附着的生物量达到4.65 gVSS/L、生物活性SOUR值为103 mgO2/(gVSS.h),均高于其它3种载体.证明亲水性多孔载体的高孔隙率、高亲水性及引入的强吸附剂均有助于载体表面微生物的生长,是一种适合于三相流化床反应器的载体.
In view of the disadvantages of high density, high fluidized energy consumption, low porosity, poor hydrophilicity and biocompatibility, and long hanging period of the fluidized bed carrier, the method of interfacial polymerization foaming Hydrophilic polymer porous carrier, through grafting glucose, doped powdered activated carbon to improve the hydrophilicity and thermal stability of the carrier, the monomer composition, catalyst, the amount of foaming agent and carrier density, porosity, water absorption The pore structure and physico-chemical properties of the hydrophilic porous carrier were characterized by BET, FT-IR and TG analyzes. The effects of the surface characteristics of the carrier on the biofilm deposition, The results showed that the optimal composition of the hydrophilic porous carrier with the volume of 1 L was as follows: the dosage of polyether triol was 50 g, TDI 20 g, glucose 7 g, powdered activated carbon 6 g, stannous octoate 0.2 g, triethylenediamine 0.4 g, foaming agent 1.5 g; Water absorption reached 315.2%, porosity (91.7%). Adsorption capacity of hydroxyl group and carrier of hydrophilic groups increased by doping glucose and powdered activated carbon. The biomass of biomass reached 4.65 gVSS / L and the bioactive SOUR value was 103 mgO2 / (gVSS.h) , Which are higher than the other three kinds of carriers.It is proved that the high porosity and high hydrophilicity of the hydrophilic porous carrier and the introduction of the strong adsorbent all contribute to the growth of microorganisms on the surface of the carrier and are suitable for the three- Reactor carrier.