摘要
针对干清粪式养猪废水4NH+浓度高和低C/N比的特点构建了四格室木质填料床A/O处理系统,通过调控运行探讨其除氮效能和机制。结果表明,在HRT 18.7 h、32℃、硝化液回流比200%、好氧区DO 1.5 mg·L-1等条件下,即便进水4NH+高达307.7 mg·L-1,COD/TN平均为0.47,系统对COD、4NH+和TN的去除率仍能维持在66.5%、93.6%和89.0%左右,TN去除负荷达到0.22 kg·m-3·d-1以上。系统对COD和TN的去除表现出一定的空间分区特征,其中前三厌氧格室是去除COD主要功能区,末端好氧格室是脱氮功能区。系统的脱氮机制以短程硝化反硝化为主,枯木填料的腐解为反硝化提供了必要的碳源。
Manure-free piggery wastewater is low in COD but high in4NH＋ concentration with a COD-to-TN （C/N） ratio less than 1. In order to removal nitrogen from the wastewater efficaciously, a wood-packed-bed A/O process with four compartments was constructed and its performance in pollutant removal was evaluated, especially the denitrification. The reactor was operated at HRT 18.7 h and 32℃ with an internal recycle ratio of 200% and DO 1.5 mg·L-1 in the last compartment. The treatment process was started up with diluted raw wastewater in which COD/TN ratio was regulated to about 3.9. When the process performed steady, the dilution rate of the raw wastewater was decreased stage by stage, synchronizing with C/N ratio. When the process was steady in the last stage even feeding the raw wastewater with a high4NH＋ of about 307.7 mg·L-1 and a COD/TN ratio as low as 0.47, the removal of COD,4NH＋ and TN was averaged out about 66.5%, 93.6% and 89.0%, respectively. A load removal of TN above 0.22 kg·m-3·d-1 was obtained. The four compartments had illustrated difference in pollutant removal with a total COD removal of about 78.3% in the front three anaerobic compartments and a TN removal of about 73.1% in the last aerobic compartment. TN removal in the reactor was mainly attributed to the shortcut nitrification-denitrification process with the packed wood as the internal carbon source.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第11期4661-4668,共8页
CIESC Journal
基金
国家水体污染控制与治理科技重大专项项目(2013ZX07201007-002-03)
黑龙江省应用技术研究与开发计划项目(GC13C303)~~
关键词
养猪废水
低C/N比
固定床
厌氧
曝气
脱氮
碳源
短程硝化
piggery wastewater
low C/N ratio
fixed-bed
anaerobic
aeration
nitrogen removal
carbon source
shortcut nitrification
