Goodarzi, Danial, Abolfathi, Soroush and Borzooeic, Sina (2020) Modelling solute transport in water disinfection systems : effects of temperature gradient on the hydraulic and disinfection efficiency of serpentine chlorine contact tanks. Journal of Water Process Engineering, 37 . 101411. doi:10.1016/j.jwpe.2020.101411 ISSN 2214-7144.

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Abstract

Chlo­rine resid­ual plays a key role in de­ter­min­ing the qual­ity of treated wa­ter and waste­water. One of the most crit­i­cal fac­tors af­fect­ing chlo­rine de­cay rates is flow and am­bi­ent tem­per­a­ture. De­tailed knowl­edge of tem­per­a­ture im­pacts on the ef­fi­ciency and per­for­mance of chlo­rine con­tact tanks will en­able op­ti­mum de­sign and op­er­a­tion of wa­ter and waste­water treat­ment in­fra­struc­tures. This pa­per de­vel­ops a ro­bust and com­pu­ta­tion­ally ef­fi­cient three-di­men­sional nu­mer­i­cal sim­u­la­tion model us­ing Reynolds-av­er­aged Navier-Stokes equa­tions (RANS) with tur­bu­lence clo­sure model. A non-re­ac­tive tracer trans­port model is de­vel­oped by im­ple­ment­ing three-di­men­sional ad­vec­tion-dif­fu­sion equa­tion. The Chlo­rine de­cay processes are sim­u­lated us­ing Reynolds-av­er­aged species trans­port model. Tem­per­a­ture ef­fects on den­sity and vis­cos­ity is sim­u­lated through Millero and, Pois­son and Vo­gel equa­tions, re­spec­tively. Eight sce­nar­ios with vari­a­tion in in­flow and am­bi­ent tem­per­a­ture are sim­u­lated in this study. The res­i­dence time dis­tri­b­u­tion (RTD) and hy­draulic ef­fi­ciency in­dexes are de­ter­mined for the sim­u­la­tion sce­nar­ios. It is shown that small fluc­tu­a­tion in in­flow and am­bi­ent tem­per­a­ture cause a sig­nif­i­cant change in chlo­rine con­cen­tra­tion and per­for­mance of dis­in­fec­tion tank. The analy­sis of nu­mer­i­cal sim­u­la­tions in­di­cated that in­crease in am­bi­ent and in­flow tem­per­a­ture can in­crease chlo­rine de­cay by up to 75 %, lead­ing to un­de­sir­able dis­in­fec­tion con­se­quences and dis­rup­tion of wa­ter treat­ment processes. The nu­mer­i­cal model de­vel­oped within this study was suc­cess­fully val­i­dated against ex­per­i­men­tal mea­sure­ments and it is shown to be ro­bust and ef­fi­cient tool to de­ter­mine op­ti­mum in­flow and am­bi­ent tem­per­a­ture con­fig­u­ra­tions for high-ef­fi­ciency wa­ter treat­ment processes and to pre­vent mi­croor­gan­ism resid­ual and by-prod­ucts dis­in­fec­tion for­ma­tion. The com­pu­ta­tional frame­work pre­sented in this study can in­form op­ti­mum de­sign of wa­ter and waste­water treat­ment processes.

Item Type:	Journal Article
Subjects:	Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TD Environmental technology. Sanitary engineering
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Sewage -- Purification, Water -- Purification, Water -- Purification -- Disinfection, Sewage -- Purification -- Simulation methods , Water -- Purification -- Simulation methods , Navier-Stokes equations
Journal or Publication Title:	Journal of Water Process Engineering
Publisher:	Elsevier
ISSN:	2214-7144
Official Date:	October 2020
Dates:	Date Event October 2020 Published 20 June 2020 Available 31 May 2020 Accepted
Volume:	37
Article Number:	101411
DOI:	10.1016/j.jwpe.2020.101411
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	23 June 2020
Date of first compliant Open Access:	20 June 2021

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