厌氧消化-化学混凝-SNAD联合工艺处理海产品加工废水

Treatment of seafood processing wastewater using anaerobic digestion-chemical coagulation-SNAD combination process

设计厌氧消化-化学混凝-SNAD联合工艺对海产品加工中的高浓泡药间废水进行处理.厌氧消化对废水中COD去除率最高可达94.37%,平均可达89.77%,有机氮与聚合磷转化为NH4^+-N、PO4^3--P,浓度分别达总氮、总磷浓度的85%~90%;20g·L^-1的聚合氯化铝可实现总磷浓度1000mg·L^-1废水的总磷去除率99.83%,出水磷浓度为1.70mg·L^-1.SNAD系统中控制温度为32~35℃,以空气流量10~15mL·min^-1间歇曝气(ton/toff=10min/5min)控制DO为0.1mg·L^-1左右,pH为7.5~8.0,HRT为24h,运行稳定时最高可处理总氮浓度为655mg·L^-1的废水,总氮、COD去除率分别为72.71%、56.70%.高通量测序结果表明反应器内形成了SNAD系统,AOB、AnAOB和DNB含量分别为2.72%、2.09%、1.46%.

An anaerobic digestion-chemical coagulation-SNAD combination process is designed for the treatment of the high-concentration foam wastewater in seafood processing. The removal rate of COD in wastewater by anaerobic digestion is up to 94.37%, with an average of 89.77%. The conversion of organic nitrogen and polyphosphate results in an increase in the concentration of NH 4^+-N and PO 4^3--P, which reaches 85%-90% of total nitrogen and total phosphorus, respectively. 20 g·L ^-1 of polyaluminum chloride can remove 99.83% of total phosphorus in the wastewater with total phosphorus content of 1 000 mg·L ^-1 . The content of phosphorus in the medium is only 1.70 mg·L ^-1 . The control temperature in the SNAD system is 32-35 ℃. The air flow rate is 10^-15 mL·min ^-1 and the way of aeration is intermittent ( ton / toff =10 min/5 min). The DO concentration is about 0.1 mg·L ^-1 , and the pH is 7.5-8.0. HRT is 24 h. When the operation is stable, the wastewater with total nitrogen content of 655 mg·L ^-1 can be treated. The total nitrogen and COD removal rates are 72.71% and 56.70%, respectively. The results of high-throughput sequencing indicate that SNAD system is formed in the reactor, and the contents of AOB, AnAOB and DNB are 2.72 %, 2.09% and 1.46%, respectively.