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Original post made
on Sep 9, 2009
Recycled water. More bad news Plenty of good water comes from heaven but, of course, you have to catch it and manage this plentiful resources.
I suppose recycled water is good for the sheeple in this valley.
Throughout the world, water is recycled in various processes to achieve several results:
#1 - to capture and contain contaminants that enter water through use in industry, agriculture, and site & storm drainage.
#2 - to capture water that results from sewage treatment including removing household, industrial and medical chemistry that combined with water in such disposal.
#3 - to prevent such contaminated water from enter natural water supplies such as wells, reservoirs and rivers.
At present, in shallow well testing in our region, we are finding traces of contamination from human and animal habitation. Fertilizers, cleaning chemistry, pharmaceuticals in animal waste are becoming saturated in our land strata leading to our available ground water. Using that example, reclaiming and recycling water to specifications that eliminate such contamination serves to provide clean, natural water sources.
Let's start that conversation with consideration,
There are different levels of "treated sewage effluent. If it's only tertiary, it likely still has toxic and dangerous contaminants. The need to conserve water has resulted in an increase in the use of treated sewage effluent, or reclaimed water, for many non-potable purposes. However, reclaimed water may contain potentially harmful contaminants with which the user must be familiar in order to minimize detrimental environmental or human health effects. The focus of this paper is on human pathogenic (disease-causing) microorganisms that may be present in reclaimed water.
Tertiary treatment (consisting of primary sedimentation, trickling filter/activated sludge, disinfection, coagulation, direct filtration, and chlorination) does not remove all pathogens. There are several ways in which an individual can acquire disease from wastewater use. Direct ingestion of the wastewater or aerosols created during spray irrigation may result in infection. In addition, infection may occur from ingestion of pathogens on contaminated vegetation or other surfaces. Another potential route of exposure is from the ingestion of ground water that has been contaminated by pathogens in irrigation water. Indeed, viruses have been detected in ground water located 27.5m below a site irrigating crops with reclaimed water.
We need to applaud Hank in bringing the issues of treating water resulting from sewer plants. Pathogen and pyrogen, as "nano-bugs" in the water are being removed with new filtering processes such as electrohydrodynamic and plasma filters. Such filtration has two effects, 1) kill such microscopic organisms, and 2) removes them as particles at less than 50 nm in size.
I suggest you have a further EBMUD story based on experts providing the processes of reclaiming various waters and how filtration achieves successful, clean delivery.
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