沸石悬浮填料生物移动床的亚硝化特性

Nitritation Performance of Zeolite Moving Bed Biofilm Reactor for Ammonium Wastewater Treatment

本研究以沸石为重要原料研制新型沸石悬浮填料,并将其用于启动沸石悬浮填料移动床反应器(ZMBBR),与装填普通陶粒的陶粒悬浮填料移动床(CMBBR)对比考察其亚硝化性能.结果表明:通过游离氨(FA)抑制的方法快速实现两种反应器的稳定亚硝化,两个反应器出水亚硝酸氮积累率均能达到90%以上;沸石对铵离子的吸附解吸作用使ZMBBR比CMBBR更快缓解FA对AOB的抑制,更有利于快速实现亚硝化;当ρ(NH^(+)_(4)-N)分别为350 mg·L^(-1)和1050 mg·L^(-1)时,CMBBR与ZMBBR均能保持长期稳定的亚硝化,NPR_(AVG)分别为0.43 kg·(m^(3)·d)-1和1.26 kg·(m^(3)·d)-1,ARE分别为82.21%和88.85%;进水ρ(NH^(+)_(4)-N)由250 mg·L^(-1)逐渐升至1250 mg·L^(-1)过程中CMBBR的最大亚硝酸氮产率(NPR_(max))仅为0.5634 kg·(m^(3)·d)-1,进水ρ(NH^(+)_(4)-N)为750 mg·L^(-1)时,ρ(FA)为166 mg·L^(-1),CMBBR受FA抑制崩溃;而ZMBBR的NPR_(max)可达1.800 kg·(m^(3)·d)-1,进水ρ(NH^(+)_(4)-N)为1250 mg·L^(-1)时,反应器在ρ(FNA)达到峰值1.9611 mg·L^(-1)后运行效果变差,随后ρ(FA)增至158 mg·L^(-1),NPR大幅降至0.9028 kg·(m^(3)·d)-1,ZMBBR运行效果显著变差.高通量测序表明,ZMBBR和CMBBR的优势菌群均为Nitrosomonas_europaea,相对丰度分别为11.15%和10.92%.

A new type of zeolite-suspended packing was developed by using zeolite as an important raw material,which was then used to start the zeolite moving bed biofilm reactor(ZMBBR).ZMBBR was compared with the ceramsite moving bed biofilm reactor(CMBBR)packed with ordinary ceramsite-suspended packing to investigate the different nitritation performance.The results showed that stable nitritation was successfully achieved in two reactors by the inhibitory effect of free ammonia(FA),and both of their nitrite accumulation rates(NAR)reached 90%;due to the adsorption of zeolite to ammonium,ZMBBR relieved the inhibition of FA on AOB faster than CMBBR and achieved nitritation earlier;CMBBR and ZMBBR could maintain long-term stable nitrosation whenρ(NH^(+)_(4)-N)was 350 mg·L^(-1) and 1050 mg·L^(-1) and NPR_(AVG) was 0.43 kg·(m^(3)·d)-1 and 1.26 kg·(m^(3)·d)-1,respectively,and ARE_(CMBBR)=82.21%and ARE_(ZMBBR)=88.85%.In the process of the influentρ(NH^(+)_(4)-N)gradually increasing from 250 mg·L^(-1) to 1250 mg·L^(-1),the maximum nitrite production rate(NPR)of CMBBR was 0.5634 kg·(m^(3)·d)-1;whenρ(FA)reached 166 mg·L^(-1) at the influentρ(NH^(+)_(4)-N)of 750 mg·L^(-1),CMBBR broke down for the heavy inhibition of FA.The maximum NPR of ZMBBR was 1.800 kg·(m^(3)·d)-1,and the performance of ZMBBR was getting worse after theρ(FNA)reached the peak value of 1.9611 mg·L^(-1) at the influentρ(NH^(+)_(4)-N)of 1250 mg·L^(-1).Subsequently,theρ(FA)of ZMBBR reached 158 mg·L^(-1) rapidly,the NPR dropped significantly to 0.9028 kg·(m^(3)·d)-1,and the performance of ZMBBR became significantly worse.It was demonstrated by high-throughput sequencing analysis that the dominant strain of ZMBBR and CMBBR was Nitrosomonas_europaea,and the relative abundances of N._europaea in ZMBBR and CMBBR were 11.15%and 10.92%,respectively.