| Autor: |
Haddaoui, Najoua, Jellal, Jamal Eddine, Boumaaza, Siham, Alaoui, Soukaina |
| Předmět: |
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| Zdroj: |
Eau, l'Industrie, les Nuisances; avr2018, Issue 411, p90-94, 5p |
| Abstrakt: |
The high-yield algal channel system continues to be one of the best-suited purification systems for small and medium-sized settlements, and it is perfectly suited to the climate conditions of the Moroccan environment. It is an extensive treatment process leading to a nett reduction in the surface area compared to the lagooning process. To enhance the system's behaviour with respect to significant organic loads, the idea of adding a tier could be a promising solution that makes it possible to both make the system more intensive - in other words to treat double the flow using the same surface area – and also to make it possible for the system to be adapted to service a settlement that is bigger as a result of an increased population. Two variants are available for the functioning of the high-yield algal channel in tiered mode, and they depend on the kind of hydraulic input that is envisaged, either in series or in parallel. There is no easy solution to the problem of oxygen reduction in the high-yield algal channel in tiered mode, and the following factors need to be taken into consideration: the masking effect and the O2 minimum. The determination of the critical height between the high and low channels has been made by using as a base the solar insolation variation during the course of a year, taking Rabat as a reference city, and the direct and diffused flows were taken into consideration during this simulation. The figures obtained for the least favourable month demonstrated that the low channel was resistant to the masking effect, this being the case without the algo-bacterial symbiosis being affected. The oxygenation factor – a key element of any normal functioning – was optimised and set by a series of experimental values obtained on the pilot station of the IAV Hassan II and Ouarzazate. So the adaptation of the High-Yield Algal Channel in tiered mode to Moroccan conditions has to be subjected to sizing models based on incorporating them into equations and modelling different hydrodynamic and bio-reactional mechanisms governing the oxygen's distribution within the tiered system. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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