發(fā)布時間：2019-04-03 06:57

【摘要】：水污染問題,已經(jīng)成為制約各地經(jīng)濟(jì)與社會發(fā)展的重要問題,提高污水排放標(biāo)準(zhǔn)和污水處理效果成了必然要求;粉煤灰每年排放量巨大,對環(huán)境的壓力與日俱增,對其進(jìn)行資源化利用勢在必行。本論文提出利用粉煤灰制備粉煤灰陶粒并對其進(jìn)行磁改性,將改性后的磁性粉煤灰陶粒作為MBBR反應(yīng)器的生物填料,從而達(dá)到以廢治廢的目的。本論文的主要研究成果如下:(1)每份粉煤灰陶粒的主要原料為30g粉煤灰,60g粘土,4g發(fā)泡劑和5g秸稈粉;燒結(jié)條件為預(yù)熱溫度600℃,預(yù)熱時間20 min;燒結(jié)溫度1240℃,燒結(jié)時間30 min。冷卻后得到的粉煤灰陶粒密度為1.01g?cm~(-3),堆積密度0.483g?cm~(-3)。陶粒比表面積,鹽酸可溶率、磨損率以及孔隙率均能達(dá)到國家《水處理用人工陶粒濾料》的標(biāo)準(zhǔn)。(2)利用硫酸亞鐵(FeSO_4)和三氯化鐵(FeCl_3)可以制備磁性材料。制備的磁性材料,主要成分是鐵氧化物(MeFe_2O_4)和亞鐵磁性氧化物(Fe_2O_3),具有弱磁性(300~450m Gs)。利用磁性材料對粉煤灰陶粒進(jìn)行磁改性,在水玻璃環(huán)境下進(jìn)行混合黏結(jié),能夠得到具有微弱磁場(30m Gs~100m Gs)的磁性粉煤灰陶粒。(3)在三套MBBR反應(yīng)器中分別利用無載體、非磁性粉煤灰陶粒和磁性粉煤灰陶粒作為生物膜填料。在相同反應(yīng)條件下,磁性陶粒載體開始掛膜時間最短為9d,非磁性陶粒載體為11d。掛膜穩(wěn)定后,磁性陶粒載體相對于無載體反應(yīng)器和非磁性陶粒載體對COD_(cr)的去除率高出約10%~15%和5%~10%;對NH_3-N的去除率高出約20%~30%和5%~10%�？梢�,磁性粉煤灰陶粒能夠提高M(jìn)BBR反應(yīng)器的掛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，

本文編號：2453001