摘要
能耗是再生水厂运行主要的考核指标.采用比能耗分析法、单元能耗分析法以及冗余分析法等探讨了清河再生水厂不同污水处理工艺(倒置A2/O、A2/O和A2/O-MBR)的能耗构成和时空分布特征.重点考察了A2/O-MBR工艺的主要能耗环节和原因,探讨了A2/O-MBR工艺的节能改造方法,并比较了其改造前后的能耗.结果表明,曝气是清河再生水厂污水处理的常规工艺和A2/O-MBR工艺的主要耗能需求,分别占总能耗的42.97%和50.65%.在保证A2/O-MBR工艺出水水质的同时,采用脉冲曝气改造后节能效果明显.改造后的膜运行通量增大约20%,吨水能耗为0.53 k W·h·t-1,降幅达42.39%,去除单位COD能耗为1.29 k W·h·kg-1,降幅达54.74%.该厂A2/O-MBR工艺回流量大,但与出水水质相关性较弱.在一定范围内降低回流比不会造成出水水质恶化,因此可作为进一步节能的方向之一.
Energy consumption is the main performance indicator of reclaimed water plant( RWP) operation. Methods of specific energy consumption analysis,unit energy consumption analysis and redundancy analysis were applied to investigate the composition and spatio-temporal distribution of energy consumption in Qinghe RWP with inverted A2/ O,A2/ O and A2/ O-MBR processes. And the A2/O-MBR process was mainly analyzed to identify the main nodes and causes for high energy consumption,approaches for energy saving were explored,and the energy consumption before and after upgrading for energy saving was compared. The results showed that aeration was the key factor affecting energy consumption in both conventional and A2/ O-MBR processes,accounting for 42. 97% and 50. 65%of total energy consumption,respectively. A pulsating aeration allowed an increasing membrane flux and remarkably reduced the energy consumption of the A2/ O-MBR process while still meeting the effluent standard,e. g.,the membrane flux was increased by 20%,and the energy consumptions per kiloton wastewater and kilogram CODremovedwere decreased by 42. 39% to 0. 53 k W·h·t- 1and by 54. 74%to 1. 29 k W·h·kg- 1,respectively. The decrease of backflow ratio in the A2/ O-MBR process within a certain range would not deteriorate the effluent quality due to its insignificant correlation with the effluent quality,and therefore may be considered as one of the ways for further energy saving.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第6期2203-2209,共7页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2012ZX07203-002)
国家自然科学基金项目(51278483)
关键词
再生水厂
A2/O-MBR
脉冲曝气
污水
能耗
reclaimed water plant
A2/O-MBR
pulse aeration
wastewater
energy consumption
