| Autor: |
Namour, Ph., Le Pimpec, P. |
| Předmět: |
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| Zdroj: |
Water Science & Technology; 2001, Vol. 43 Issue 5, p231, 8p |
| Abstrakt: |
For the biochemical study of assimilation capacity (AC), two hypotheses were put forward (three levels of response, the hyporheon being the main site of self-purification). A physical model was designed, simulating the hyporheon and its response to increasing inputs of proteins was studied. The analyses evidence a low accumulation of proteins in the hyporheic biofilms for daily flows ranging from 0.1 to 20 mg/day. The percolation of proteins stimulates the proteolytic activity (increase in V[subm]) whereas the Km shows no significant change ; the assimilation capacities thus stimulated are vastly superior to the daily loads introduced into the system and explain the low accumulation of proteins. This stimulation concerns only a shallow active zone < 2 cm. For the future, a method of localising zones of hyporheic infiltrations (micro-piezometry, tracing, etc.) should be developed to monitor in situ the action of inputs of organic matter (OM) to estimate the AC of the river. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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