摘要
为了提高载体的生物挂膜性能,采用葡萄糖接枝发泡法制备了亲水性聚合物多孔载体,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;利用红外光谱(IR)、热重(TG)和气质联用(GC—MS)表征了亲水性多孔载体的结构性能;并通过4种不同载体的生物流化床挂膜试验考察了载体表面特性对生物挂膜量、生物活性的影响,同时揭示了亲水性多孔载体生物挂膜性能的机理。结果表明,制备约1 L的亲水性多孔载体的较佳组分:聚醚三元醇用量为50g、TD I为20 g、葡萄糖为7 g、辛酸亚锡为0.2 g、三亚乙基二胺为0.4 g、水为1.5 g;在该组分下制备的载体具有丰富的孔隙结构,孔隙率达到91.8%,吸水率为326.2%;通过接枝葡萄糖增加了亲水性基团羟基,附着的生物量达到4.30 gVSS/L、生物活性SOUR值为101 mgO2/(gVSS.h),均高于其他3种载体。这说明亲水性多孔载体的高孔隙率、高亲水性及引入的营养元素均有助于载体表面微生物的生长,是一种适合于流化床反应器的载体。
In order to improve the performance of biofilm formation, a new hydrophilic porous carrier was prepared by the glucose-grafted foaming method. The effects of monomer composition, the amounts and concentrations of catalyst and foaming agent used on the structure characteristics of hydrophilic porous carrier were studied. The surface structure of hydrophilic porous carrier was characterized by IR, TG and GC - MS and the mechanisms were further explored. Four kinds of contrast tests were made using the hydrophilic porous cartier, conventional porous cartier, granular activated carbon （GAC） and plastic used for forming biofilm in biofluidized bed to study the effects of cartier structure on biofilm and bioactivity. The results show that the best composition is poly-aether of 50 g , TDI of 20 g, glucose of 7 g, stannous octanoate of 0.2 g, triethylene diamine of 0.4 g and H20 of 1.5 g. Under these conditions, the porosity and hydroscopicity of hydrophilic porous carrier are 91.8% and 326.2% respectively, and the hydrophilic group （hydroxyl） is introduced on the carrier. Attached biomass and bioactivity on the hydrophilic porous cartier are 4.30 gVSS/L and 101 mgOJ （gVSS·h） respectively with the concentration higher than that of the other three carriers. High porosity, hydrophilic surface and addition of nutrients can contribute to microorganism growth on the carrier surface. The hydrophilic porous carrier is a suitable carrier to biofluidized bed.
出处
《中国给水排水》
CAS
CSCD
北大核心
2006年第19期82-86,90,共6页
China Water & Wastewater
基金
国家自然科学基金资助项目(50278036)
广东省自然科学基金重点资助项目(04105951)
关键词
生物流化床
亲水性多孔载体
挂膜
生物活性
biofluidized bed
hydrophilic porous carrier
forming biofilm
bioactivity
