oosik
Epic Contributor
Jinman,
Domestic residential sewage is difficult to pin down. Normally solids will be only 0.1 to 0.75%(less than one percent) by volume. This is one of the reasons it is costly to treat - so much liquid to solid and once the liquid & solid are mixed the mixture must all receive treatment. Of course, the other reason is pathogenic microorganisms which can be exceedingly difficult to kill. This is why the spreading of sewage from a pump truck is, normally, so tightly controlled by the local health dept. Where I worked for the health dept here in WA one of the conditions was the tractor & disk harrow had to be in the field with operator when the pumper truck arrived so the disking in operation could start w/out delay. The tractor had to have annual operational certification from a registered dealer and an employee of the health dept had to physically observe an actual disking in operation at least once a month during the months of operation. Its quite obvious we had problems with no show on the tractor/operator, last minute calls saying that the tractor wouldn't be running today etc, etc. There were times I got so Go_ Da_ _ mad at this entire operational situation --- its just lucky for me that I wasn't allowed to carry a weapon.
Domestic residential sewage is difficult to pin down. Normally solids will be only 0.1 to 0.75%(less than one percent) by volume. This is one of the reasons it is costly to treat - so much liquid to solid and once the liquid & solid are mixed the mixture must all receive treatment. Of course, the other reason is pathogenic microorganisms which can be exceedingly difficult to kill. This is why the spreading of sewage from a pump truck is, normally, so tightly controlled by the local health dept. Where I worked for the health dept here in WA one of the conditions was the tractor & disk harrow had to be in the field with operator when the pumper truck arrived so the disking in operation could start w/out delay. The tractor had to have annual operational certification from a registered dealer and an employee of the health dept had to physically observe an actual disking in operation at least once a month during the months of operation. Its quite obvious we had problems with no show on the tractor/operator, last minute calls saying that the tractor wouldn't be running today etc, etc. There were times I got so Go_ Da_ _ mad at this entire operational situation --- its just lucky for me that I wasn't allowed to carry a weapon.