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131639

Biological Treatment of Organic Loads in Surface Flow Constructed Wetland Using Convective Dispersion Mixing Flow Model.

Article

Last updated: 04 Jan 2025

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Civil Engineering

Abstract

 Wastewater treatment through constructed wetland is a combination of physical, biological and chemical treatment processes. These processes are described by plug flow, mixed flow or by the plug - mixing flow combination. The concept for describing removal of organic loads biologically with treating the wetland as a series of completely stirred tanks reactors is practically applied (Chen et al, 1999). Each of stirred tank reactors is presumed to be completely mixed and the concentration departing each is equal to the uniform, internal concentration. 
A model is used to assess the BOD removal through free water surface (FWS) constructed wetland in a pilot scale project treating drainage wastewater before dumping at Lake Manzala on the North of Egypt. Two assumptions are used in the model application; the fully mixing stirred tank reactor with fully dispersion and diffusion inside and between the wetland subsystems. The other assumption is proposed as a new idea based on the fully mixed flow assumption, namely; the partially mixing stirred tank reactor with fully dispersion and diffusion inside and a plug flow between the wetland subsystems. Sensitivity analysis of the two assumptions is presented as well as a comparison between the BOD treatment results and the corresponding results obtained from field data. 
Sensitivity results shows that for both model assumptions, BOD treatment improves with increasing number of internal mixing tanks, removal rate constant, and hydraulic detention time and with decreasing the aspect ratio (length/width). In both model assumptions the BOD concentration values were nearly comparable with the corresponding measured BOD values along the wetland length with a mean absolute error of 11.7% for the case of fully mixed flow and 12.5% the case of partially fully mixed flow. 

DOI

10.21608/bfemu.2020.131639

Keywords

Wetland, Drainage water, plug flow, mixed flow, and pollutants

Authors

First Name

Saad Hamed

Last Name

Moharram

MiddleName

Saad

Affiliation

irrigation and Hydraulics Department., Faculty of Engineering., El-Manosura University., Mansoura., Egypt

Email

-

City

Mansoura

Orcid

-

First Name

Abd- ElRazek

Last Name

Zidan

MiddleName

Ahmed El-Sayed

Affiliation

irrigation and Hydraulics Department., Faculty of Engineering., El-Manosura University., Mansoura., Egypt

Email

-

City

Mansoura

Orcid

-

First Name

A.

Last Name

Rashed

MiddleName

A.

Affiliation

The Chair person and Researcher, National Water Research Center, MWRI.

Email

-

City

-

Orcid

-

First Name

S.

Last Name

Abedel Gawad

MiddleName

T.

Affiliation

The Chair person and Researcher, National Water Research Center, MWRI.

Email

-

City

-

Orcid

-

Volume

30

Article Issue

3

Related Issue

19436

Issue Date

2005-09-01

Receive Date

2005-06-11

Publish Date

2021-09-01

Page Start

1

Page End

17

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 30_Issue 3_Pages 1-17.pdf

PDF . 189.1kB

Link

https://bfemu.journals.ekb.eg/article_131639.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=131639

Order

1

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Biological Treatment of Organic Loads in Surface Flow Constructed Wetland Using Convective Dispersion Mixing Flow Model.

Details

Type

Article

Created At

22 Jan 2023