With proper engineering, a composter can drain leachate through 1 to 2 in. (25.4 to 50 mm) drain pipe. This large size prevents clogging by solids and allows larger volumes, should a flush toilet be used. Note: Drain lines should be vented. Many codes require separate venting for any drain system, but you might be… Continue Reading

Draining leachate with a drain line lowers your handling of the leachate. Generally, you should drain it to: A tank that is pumped out by a septage hauler; A septic system (septic tank and leach field); A system to be combined with graywater for irrigation of plants such as the Ecocyclet. U.S. regulators usually require… Continue Reading

Some composting toilet systems, especially the cottage models, have internal electric heaters to evaporate leachate. They are usually effective, but they require a lot of energy – about 9000 BTUs per gallon. At 10 cents per kWh, that’s about 30 cents a gallon (3.79 l).

Leachate can be difficult to manage because, as the water evaporates, sludge forms, which should be removed periodically. It can clog screens, grates, and filters in some composters; block outlet holes and openings, drain hoses, and pipes; and harden on internal mixing equipment — causing maintenance headaches over time. Some composters have fittings that can… Continue Reading