Development And Characterization Of Zeolite Biological Porous Filter For Denitrification Wastewater Treatment By Intermittent Operation

In recent years,urban sewage treatment plant has ginned more and more attention by the community as an important facility for urban water purification.Aeration biological filter,as a combination of activated sludge and biofilm method of mature water treatment process,with characteristic such as small footprint,low investment,and high degree of automation and so on,is very sui Tab for the current old sewage treatment plant upgrade and Transformation.In this study.Zeolite porous biological filter?ZPBF?was prepared using mixed cement,raw zeolite,and aluminum powder through optimization experiment and used as a novel filter medium in biological aerated filter?BAF?.The properties of the ZPBF were analyzed by scanning electron microscopy?SEM?,and porosimetry.Using a variety of molecular biology methods for the analysis of microbial characteristics in ZBPF-BAF.The results show that ZPBF has a large BET-N2?59.54m2/g?and average pore diameter?11.92nm?as well as a high porosity?29.55%?.In addition,the uniform and interconnected pores in ZPBF made it sui Tab for the microbial growth.In order to prove the feasibility of the use of ZPBF in BAF,ZPBF used in the BAF were investigated for city wastewater treatment.Thus,intermittent dynamic experiments were conducted,the intermittent operation cycle included adsorption,biological regeneration,and drip washing ZPBF.Until concentration of NH₄⁺-N was more than 1.5 mg/L of effluent standards,water in ZPBF-BAF was firstly emptied.The results show that NH₄⁺-N average removal was 87% and TN average removal was 60% at the blast for 24 h and 5d of continuous operation period.The results show that the effluent water could comply with the first grade B in "Discharge Standard of Water Pollutants for Bei Jing city".