焦化废水脱除氨氮过程的操作优化  

Operation optimization of ammonia-nitrogen removal process in coking wastewater treatment

作　　者：廖明森 赵月红[2] 宁朋歌[2] 曹宏斌[2] 温浩[2] 张懿[1,2] 

机构地区：[1]天津大学化工学院,天津300072 [2]中国科学院过程工程研究所,北京100190 [3]精馏技术国家工程研究中心,天津300072

出　　处：《计算机与应用化学》2014年第6期669-674,共6页Computers and Applied Chemistry

基　　金：国家重大水专项基金资助项目(2012ZX07202006;2013ZX07209001)

摘　　要：当前针对焦化废水氨氮去除过程的优化研究多集中在单元操作,对脱除氨氮全过程的研究较少。本文对蒸氨塔预处理-短程硝化/厌氧氨氧化/全程硝化(D-O_1-A-O_2)耦合脱除氨氮的工艺过程进行了建模和优化。在蒸氨塔预处理和O_1-A-O_2生物脱氮2个操作单元优化模型的基础上,通过合理简化建立了全过程操作优化模型。模型结果显示:在蒸氨塔入口氨氮浓度4000 mg·L^(-1)的条件下,当蒸氨塔出口氨氮浓度为128 mg·L^(-1),短程硝化反应周期为10 h,蒸氨塔出水旁路输送量为11.448m^3·h^(-1)时,整体操作费用最低。进一步分析表明:对于采用O_1-A-O_2工艺进行生物脱氮的过程,主要操作费用集中在O_1过程,通过将部分蒸氨塔出水直接输送至厌氧氨氧化反应器可以降低O_1负荷30.174%,从而整体操作费用降低0.606$·t^(-1)。Currently,most of the optimization researches of ammonia-nitrogen removal process are focused on the unit operations in coking wastewater treatment without considering the interactions between units.In this paper,a mathematical model of the overall ammonia-nitrogen removal process,which combines distillation with shortcut nitrification/ANAMMOX/denitrification （O1-A-O2）,is proposed for its operation optimization.Optimization model is established based on the simplification of unit operation models according to the key parameters.The results indicate that the minimum operating cost is obtained at ammonia-nitrogen outlet concentration 128 mg/L,reaction recycle time of O1 10 h and passby flowrate 11.448 m3/h when the ammonia-nitrogen inlet concentration of distillation column is 4000 mg/L.Further study reveals that the cost of O1 operation is the major part of the bio-treatment process.And the passby of O1 reactor could reduce its duty by 30.174 ％ thus the total cost decrease by 0.606 ￥/t.

关 键 词：焦化废水 过程优化 蒸氨塔 短程硝化 厌氧氨氮氧化 

分 类 号：TQ028.31[化学工程]