摘要
This paper reports a comparative evaluation between 2 kinetic models for predicting nitrification and biodegradable organics(BOD5)removal rates in 5 vertical flow(VF)wetland systems,that received strong wastewaters(i.e.tannery,textile and municipal effluents).The models were formulated by combining first order and Monod kinetics,with continuous-stirred tank reactor(CSTR)flow approach.The performance of the 2 models had been evaluated with3 statistical parameters:coefficient of determination(R2),relative root mean square error(RRMSE),and model efficiency(ME).The statistical parameters indicated better performance of the Monod CSTR model(over first order CSTR approach),for correlating ammoniacal nitrogen(NH4+—N)and BOD5removal profiles across VF systems.Higher Monod coefficient values(from Monod CSTR model)coincided with greater input NH4+—N and BOD5loading,and experimentally measured removal rate(g/(m2·d))values.Such trends indicate that NH4+—N and BOD5removals in the VF systems were mainly achieved via biological routes.On the other hand,the rate constants(from the first order CSTR model)did not exhibit such correlations(of Monod coefficients),elucidating their inefficiencies in capturing overall removal mechanisms.The interference of organics removal on nitrification process(in VF wetlands)was identified through Monod coefficients.The deviation between NH4+—N and BOD5Monod coefficients imply incorporation of both coefficients,for calculating the area of a single VF bed.Overall,closer performance of the Monod CSTR model for predicting NH4+—N and BOD5removals indicate its potential application,as a design tool for VF systems.
This paper reports a comparative evaluation between 2 kinetic models for predicting nitrification and biode- gradable organics （BODs） removal rates in 5 vertical flow （VF） wetland systems, that received strong wastewaters （i.e. tannery, textile and municipal effluents）. The models were formulated by combining first order and Monod kinetics, with continuous-stirred tank reactor （CSTR） flow approach. The performance of the 2 models had been evaluated with 3 statistical parameters： coefficient of determination （R2）, relative root mean square error （RRMSE）, and model efficien- cy （ME）. The statistical parameters indicated better performance of the Monod CSTR model （over first order CSTR ap- proach）, for correlating ammoniacal nitrogen （NH4 ＋-N） and BOD5 removal profiles across VF systems. Higher Monod coefficient values （from Monod CSTR model） coincided with greater input NH4＋-N and BOD5 loading, and experimentally measured removal rate （g/（m2·d）） values. Such trends indicate that NH4＋-N and BOD5 removals in the VF systems were mainly achieved via biological routes. On the other hand, the rate constants （from the first order CSTR model） did not exhibit such correlations （of Monod coefficients）, elucidating their inefficiencies in capturing overall removal mechanisms. The interference of organics removal on nitrification process （in VF wetlands） was identi- fied through Monod coefficients. The deviation between NH4＋-N and BOD5 Monod coefficients imply incorporation of both coefficients, for calculating the area of a single VF bed. Overall, closer performance of the Monod CSTR mod- el for predicting NH4＋-N and BODs removals indicate its potential application, as a design tool for VF systems.
出处
《湿地科学》
CSCD
北大核心
2013年第4期421-432,共12页
Wetland Science
关键词
CSTR
废物处理
技术方法
BOD
constructed wetlands
continuous-stirred tank reactor （CSTR）
modelling
Monod kinetics
vertical flow
wastewater
