posted 12 years ago
I have a serious problem with the notion of using municipal sewage for growing vegetables. While the Public Works Department may follow the procedures as laid out in their processing manual, monitored temps and moisture, and even testing the resulting material for coliform bacteria, there's a whole lot more going into a municipal sewer system than feces and urine.
Every pill taken by every human in the town, plus their guests, plus every person from out of town using a public restroom. There are medications which don't break down readily in composting conditions, even hot, professionally monitored batches. Then there is everything people toss down the sink and flush down the toilet. Paint thinner, leftover pesticides found when cleaning the garage, that stuff they clean the tops of those fancy stoves with no burners, every hair tonic and shampoo known to man, grease and oil from handwashing, drain cleaners, rat poison, antifreeze...pretty much anything that will fit down the drain goes down the drain, plus the stuff the town adds to the water supply-corrosion inhibitors, chlorine, flouride, acetohalenes- to squeak it past the safe drinking water guidelines.
Let this stuff sit in the sewer system for a while in the heat of summer and humidity of enclosed pipes, gently mixing as it flows to the treatment plant. Add alum, salts defoamers and flocculants to try to clean it up. Float off some stuff, let other stuff precipitate out of solution, then separate the compostable solids from this chemical soup for use in making safe topsoil for your vegetables.
Next, you must trust your local budget constrained, under staffed government bureaucracy to test for safe levels of every toxin under the sun in order to then give the stuff away free or sell to the good people at a few bucks per truckload to save the cost of hazardous waste removal and storage.
Safe for vegetables?
Your call.
Seed the Mind, Harvest Ideas.
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