用粉煤灰稳定抗生素废水处理剩余污泥的研究

利用粉煤灰稳定抗生素废水处理过程中产生的剩余污泥的试验表明:粉煤灰与剩余污泥按一定比例混合搅拌后,混合物的重金属离子浓度和病原菌的含量均低于农用规定的浓度。在粉煤灰对重金属离子的固定机制中,表面络合作用在较宽的pH值范围内,尤其是在较低pH值时起主要作用,氢氧化物沉淀作用在较高pH值时是主要作用机制;粉煤灰的强碱性是杀死剩余污泥中微生物的主要原因。

Study on Excess Sewage Sludge from Antibiotic Wastewater Treatment Conditioning with Fly Ash

The Test of excess sewage sludge from antibiotic production wastewater treatmetnt conditioning with fly ash was carried out for the first time. Fly ash and excess sewage sludge were mixed at four different ratios for three times. Taking heavy metal ion concetration and pathogens into account the mixture could be used as soil amend agent. Surface complexation and deposition (silicate deposition and hydrate deposition) were the main mechanisms of fixation of heavy metal by fly ash . Surface complexation and silicate deposition worked at relatively wider pH range, especially on low pH. Hydrate deposition worked at higher pH. High alkalinity was thought to be the dominant reason for killing pathogens.