Optimization of hydraulic efficiency and wastewater treatment performances using a new design of vertical flow Multi-Soil-Layering (MSL) technolgy

Latrach, Lahbib; Ouazzani, Naaila; Hejjaj, Abdessamad; Zouhir, Fouad; Mahi, Mustapha; Masunaga, Tsugiyuki; Mandi, Laila

doi:10.1016/j.ecoleng.2018.04.003

Article (Scientific journals)

Optimization of hydraulic efficiency and wastewater treatment performances using a new design of vertical flow Multi-Soil-Layering (MSL) technolgy

Latrach, Lahbib; Ouazzani, Naaila; Hejjaj, Abdessamad et al.

2018 • In Ecological Engineering, 117, p. 140-152

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/226061

DOI
10.1016/j.ecoleng.2018.04.003

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Keywords :

hydraulic efficiency; modified multi soil-layering system; standard multi soil-layering system; purifying performance; retention time distribution

Abstract :

[en] The study gives a new method for contaminants removal from domestic wastewater using a novel design of Multi-Soil-Layering (MSL) eco-technology. Two MSL reactors were built and operated under laboratory conditions: astandard and modiﬁed MSL design(S-MSL andM-MSL). Atracer testusing KClindicated varyingdegrees of dispersion, short-circuiting, dead space, eﬀective volume ratio and hydraulic eﬃciency in two MSL reactors. The new MSL design was found to be most eﬀective in improving hydrodynamic ﬂow conditions. The M-MSL reactor increased the mean HRT from 15.79 to 22.07h, and decreased the dead space rate from 38% to 8%. The early arrival of the distribution peak, indicator of short-circuiting, was mainly noted in the case of S-MSL RTD which is around 57% of the nominal HRT. A high dead space rate was found to occur in the S-MSL reactor, and produced a poor hydraulic performance. The large diﬀerence between the nominal and mean HRT conﬁrms the presence of zones of stagnation in the S-MSL system. The new MSL design increased the eﬀective volume ratio from 0.62 to 0.92. The hydraulic eﬃciency was increased from 0.26 to 0.84 and reached a good level (λ≥0.75) highlighting the excellent hydraulic performance of the M-MSL design. Obtained results revealed that M-MSL had an optimal hydraulic proﬁle and enhanced sanitary and physicochemical performances compared to S-MSL. The mean log reduction of total coliforms, fecal coliforms and fecal streptococci was increased from 1.25, 1.26 and 1.15 log units for the S-MSL to 2.36, 2.38 and 2.11 log units for the M-MSL reactor. Both MSL reactors achieved high and satisfactory TSS and organics removal. The M-MSL reactor accomplished a 92% removal of TN, while the S-MSL achieved a slightly less eﬀective result. The M-MSL reactor was also found to be more eﬃcient in reducing TP by 98% compared to a removal rate of 76% in the S-MSL reactor. Therefore, the new design of MSL eco-technology could be adopted as an alternative to the current design for eﬃcient domestic wastewater treatment.

Disciplines :

Environmental sciences & ecology

Author, co-author :

Latrach, Lahbib

Ouazzani, Naaila

Hejjaj, Abdessamad

Zouhir, Fouad ; Université de Liège - ULiège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > Assainissement et Environnement

Mahi, Mustapha

Masunaga, Tsugiyuki

Mandi, Laila

Language :

English

Title :

Optimization of hydraulic efficiency and wastewater treatment performances using a new design of vertical flow Multi-Soil-Layering (MSL) technolgy

Publication date :

2018

Journal title :

Ecological Engineering

ISSN :

0925-8574

Publisher :

Elsevier, Netherlands

Volume :

117

Pages :

140-152

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 29 June 2018

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