磁性粉煤灰陶粒的制备及在MBBR中的应用研究
发布时间：2019-04-03 06:57
【摘要】：水污染问题,已经成为制约各地经济与社会发展的重要问题,提高污水排放标准和污水处理效果成了必然要求;粉煤灰每年排放量巨大,对环境的压力与日俱增,对其进行资源化利用势在必行。本论文提出利用粉煤灰制备粉煤灰陶粒并对其进行磁改性,将改性后的磁性粉煤灰陶粒作为MBBR反应器的生物填料,从而达到以废治废的目的。本论文的主要研究成果如下:(1)每份粉煤灰陶粒的主要原料为30g粉煤灰,60g粘土,4g发泡剂和5g秸秆粉;烧结条件为预热温度600℃,预热时间20 min;烧结温度1240℃,烧结时间30 min。冷却后得到的粉煤灰陶粒密度为1.01g?cm~(-3),堆积密度0.483g?cm~(-3)。陶粒比表面积,盐酸可溶率、磨损率以及孔隙率均能达到国家《水处理用人工陶粒滤料》的标准。(2)利用硫酸亚铁(FeSO_4)和三氯化铁(FeCl_3)可以制备磁性材料。制备的磁性材料,主要成分是铁氧化物(MeFe_2O_4)和亚铁磁性氧化物(Fe_2O_3),具有弱磁性(300~450m Gs)。利用磁性材料对粉煤灰陶粒进行磁改性,在水玻璃环境下进行混合黏结,能够得到具有微弱磁场(30m Gs~100m Gs)的磁性粉煤灰陶粒。(3)在三套MBBR反应器中分别利用无载体、非磁性粉煤灰陶粒和磁性粉煤灰陶粒作为生物膜填料。在相同反应条件下,磁性陶粒载体开始挂膜时间最短为9d,非磁性陶粒载体为11d。挂膜稳定后,磁性陶粒载体相对于无载体反应器和非磁性陶粒载体对COD_(cr)的去除率高出约10%~15%和5%~10%;对NH_3-N的去除率高出约20%~30%和5%~10%。可见,磁性粉煤灰陶粒能够提高MBBR反应器的挂膜速率和污染物的去除效果。
[Abstract]:Water pollution has become an important problem restricting the development of local economy and society, and it is necessary to improve the standard of sewage discharge and the effect of sewage treatment. Fly ash emission is huge every year, the pressure on the environment is increasing day by day, it is imperative to utilize the fly ash resource. In this paper, the preparation of fly ash ceramsite by fly ash and its magnetic modification, the modified magnetic fly ash ceramsite was used as bio-filler of MBBR reactor, so as to achieve the purpose of treating waste by waste. The main research results of this paper are as follows: (1) the main raw materials of fly ash ceramsite are 30g fly ash, 60g clay, 4G foaming agent and 5g straw powder, the sintering conditions are preheating temperature 600 鈩，
本文编号：2453001
[Abstract]:Water pollution has become an important problem restricting the development of local economy and society, and it is necessary to improve the standard of sewage discharge and the effect of sewage treatment. Fly ash emission is huge every year, the pressure on the environment is increasing day by day, it is imperative to utilize the fly ash resource. In this paper, the preparation of fly ash ceramsite by fly ash and its magnetic modification, the modified magnetic fly ash ceramsite was used as bio-filler of MBBR reactor, so as to achieve the purpose of treating waste by waste. The main research results of this paper are as follows: (1) the main raw materials of fly ash ceramsite are 30g fly ash, 60g clay, 4G foaming agent and 5g straw powder, the sintering conditions are preheating temperature 600 鈩，
本文编号：2453001
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