im in the process of building a small brewery, part of the regulations include a bathroom (flush toilet needed). no sewer onsite, the plant needs to be on septic.
the brewing (or cleaning) process uses some pretty harsh chemicals (and low concnetration). we generate 50 liters of 2 ppm caustic soda, 50 liters of 2 ppm nitric acid, and 50 liters of a iodine based sanitizer~3 days/week. by design, it kills microorganism, which will mean keeping a healthy septic system going difficult.
my current working plan is this. basically having two systems, one for the toilet, the second for the sinks/area drains of teh brewery. The two stsyems would have a shared leach field/reed bed (more on this below). i would like to design the primary box for teh chemical system to have a candy cane outlet. letting a good amount of water (100-200 liters) be stored, and when it reaches the fill point, the entire box will be syphoned out and discharge to the leech field. allowing to two cleaning chemicals to be mixed and to cool down. the toilet would have a sediment trap at the road (for cleanout of solids) and discharge to the same leach field.
leach field; we have about 30-50 cm of top soil and the sub soil is heavy clay (and sesonally high water table). if this was going to be permitted in the US, it would never pass the perc test. That is why i am thinking about a wetland/reed bed tretament, and over flow discharge. i think the reedbed would be 1 m wide x 1 m deep x 2-3 m long, filled with gravel. i would want to install a few baffles to slow down flow and limit short circuiting. overflow would go to a existing drainage ditch which connects to a abandoned oxbow meander.
ideas? comments? quetsions?