5. Conclusions
The prescribed intermittent chlorination regime was found to be effective for plate heat exchangers at the offshore site.
Viable bacterial counts in chlorinated biofilms were reduced some 94% compared to controls. Biolms were patchy,non-uniform and predominantly bacterial. Diatoms and other algal forms were not observed. As the biolm aged, corrosion
products were found to accumulate on the plates, which in turn led to entrapment of suspended particulate matter from the bulk fluid.
This was further compounded by the adsorption oforganic matter onto the particles, leading to the formation of a barrier between the biolm cells and the bulk fluid.
It is possible that the barrier may consume most of the free chlorine before it is available for killing the cells.
This may synergistically be responsible for the observed decrease in the biocidal the efficiency of chlorine in older biofilms (48 h onwards), which showed bacterial regeneration and growth.
From the present study it is evident that the use of a biodispersant along with the biocide is imperative. This would aid in removing the dead cells and the polymer matrix
from the surface, thus facilitating the infusibility of the biocide and its activity. Chlorination was effective in controlling the levels of sulphate reducers
5. ConclusionsThe prescribed intermittent chlorination regime was found to be effective for plate heat exchangers at the offshore site.Viable bacterial counts in chlorinated biofilms were reduced some 94% compared to controls. Biolms were patchy,non-uniform and predominantly bacterial. Diatoms and other algal forms were not observed. As the biolm aged, corrosionproducts were found to accumulate on the plates, which in turn led to entrapment of suspended particulate matter from the bulk fluid. This was further compounded by the adsorption oforganic matter onto the particles, leading to the formation of a barrier between the biolm cells and the bulk fluid. It is possible that the barrier may consume most of the free chlorine before it is available for killing the cells.This may synergistically be responsible for the observed decrease in the biocidal the efficiency of chlorine in older biofilms (48 h onwards), which showed bacterial regeneration and growth. From the present study it is evident that the use of a biodispersant along with the biocide is imperative. This would aid in removing the dead cells and the polymer matrixfrom the surface, thus facilitating the infusibility of the biocide and its activity. Chlorination was effective in controlling the levels of sulphate reducers
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