Read e-book online A practical guide to particle counting for drinking water PDF

By John Michael Broadwell

ISBN-10: 1566703069

ISBN-13: 9781566703062

We tested how invasion of tropical riparian forests by way of an unique N-fixing tree (Falcataria moluccana) impacts organic-matter dynamics in a Hawaiian river through evaluating early levels of leaf-litter breakdown among the unique F. moluccana and local Metrosideros polymorpha timber. We tested early decomposition levels as a result of low leaf-litter retention premiums (<20 d) that consequence from the flashy nature of Read more...

summary: We tested how invasion of tropical riparian forests by means of an unique N-fixing tree (Falcataria moluccana) impacts organic-matter dynamics in a Hawaiian river by means of evaluating early levels of leaf-litter breakdown among the unique F. moluccana and local Metrosideros polymorpha bushes. We tested early decomposition levels as a result of low leaf-litter retention premiums (<20 d) that outcome from the flashy nature of tropical Pacific Island streams. Leaf breakdown charges, fungal biomass, and invertebrate abundances have been forty, a hundred and twenty, and 30% larger, respectively, for F. moluccana than M. polymorpha leaves. Leaf-litter breakdown was once mostly end result of the movement stream and to a lesser quantity fungal colonization. Invertebrates weren't a massive consider leaf-litter breakdown. preliminary tannin content material, leaf C∶N, and sturdiness have been vital intrinsic components inhibiting leaf breakdown and fungal colonization. Regression analyses among closing N content material (%) and ash-free dry mass of leaf clutter printed that the early levels of F. moluccana leaf-litter breakdown are a resource of N to streams invaded by means of F. moluccana and give a contribution a conservatively envisioned 2.1 to 5.7% to the to be had overall dissolved N pool. Direct enter of F. moluccana leaf clutter impacts early phases of leaf-litter breakdown in tropical streams with low leaf-litter retention premiums. Direct enter of leaf muddle additionally contributes a bit to N inputs, yet subsurface flows via N-rich soils of F. moluccana-invaded riparian forests most likely are a better resource

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Extra info for A practical guide to particle counting for drinking water treatment

Example text

While the particle counts did not directly point to the problem, they caused the operators to take a closer look at the filter, and the problem was discovered. Note that the counts on the faulty filter were still quite low, but were an order of magnitude higher than the other filter counts. This is a good example of why it is important to look for meaningful clues in the data, as opposed to targeting a specific number of counts. Damaged filter media will often be indicated by carbon fines in the filter effluent.

Practical Considerations In most cases, less-than-ideal conditions exist for choosing tap locations and minimizing sample line lengths. For instance, the shortest line length may require that the particle counter be mounted behind a pipe where it is hard to access. If it is hard to access, it will not be cleaned and maintained properly, and will eventually be ignored or taken out of service. It is much better to mount the particle counter where it can be easily reached for maintenance, even if the sample line length is increased.

This requires that a filter be placed between the particle counter and the flowmeter. This filter creates headloss, and must be replaced periodically. The nonintrusive-type meters tend to be more expensive, some costing more than half as much as the particle counter. These meters are usually designed to handle special chemicals, and are often made of materials designed to handle corrosive or high-purity liquids. This drives the cost up even farther. The very low (100 to 200 ml/min) sample flow rates used for particle counting are difficult to measure, and it has only been feasible for applications where the cost of the process can justify expensive instrumentation.

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A practical guide to particle counting for drinking water treatment by John Michael Broadwell


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