强化循环厌氧反应器处理印染废水的中试启动研究

Study on pilot-scale start-up characters of strengthen circulation anaerobic reactor for treating printing and dyeing wastewater

应用自主研制的强化循环厌氧反应器(SCAR)中试规模处理实际印染废水,研究反应器的启动特性。反应器接种厌氧颗粒污泥后启动运行83 d,形成连续内循环并实现了对印染废水处理的高效稳定运行。在进水COD浓度1 000~3 650 mg/L、系统容积负荷0.7~6.4 kg/(m3·d)条件下,废水COD和色度平均去除率分别达到55%和73%。反应器内较高浓度的NH+4-N保证了系统pH的稳定性,350~600 mg/L的NH+4-N浓度没有对强化循环厌氧反应器产生抑制作用,系统内也没有出现VFA(以乙酸计)积累。启动过程中,厌氧颗粒污泥的粒径增大、沉降性能变好。启动实验完成时,反应器内微生物的脱氢酶活性(以TF计)和辅酶F420浓度分别为3.4973 mg/(g·h)和0.1872μmol/g。

The start-up characters of treating real printing and dyeing wastewater by a self-made pilot-scale strengthen circulation anaerobic reactor were investigated in the experiment. Seeded with anaerobic granular sludge,the reactor started by using real printing and dyeing wastewater as influent with COD concentration of1 000 ~ 3 650 mg /L. Within the 83 days start-up running,the reactor reached a state with high efficiency and formed a continuous internal circulation. The results showed that the average removal rates of COD and chroma were up to 55% and 73%,respectively while the system volume loading rate was 0. 7 ~ 6. 4 kg /( m3·d). It proved that 350 ~ 600 mg /L of NH+4-N had no inhibition to the strengthen circulation anaerobic reactor and ensured the stability of the pH value of the system and VFA with acetic acid expression also didn't accumulate in the system. During the start-up,the size of anaerobic granular sludge particle increased and the sludge sedimentation performance became better. At the end of the start-up,the values of dehydrogenase activity( DHA) with TF expression and the coenzyme F420 concentration were 3. 4973 mg /( g·h) and 0. 1872 μmol /g,respectively.