Sink Blackwater System

Introduction

• Kitchen sink water, due to its potential for high organic matter loading, is considered blackwater in design practice
• The Seed Eco-Home uses a 2-tote Open Source Biodigester design, where the kitchen sink feeds the biodigter with active pumping via a macerator lift pump.

Sink Feed Concept

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Data Collection

• The Sink Feed Concept above with 4" down-pipe contains only about 1.3 gallons volume total (about 2 feet of length total)
• Interesting, this low volume made it such that the 1.4 gallon volume of the water pipes going to the biodigester (about 35 feet of 1" pipe), whenever pump was shut off, would fall back down and cause backflow into the sink, fouling the air
• It turns out that the check valve (see design above) does not work in practice with sink blackwater

Links

• Biodigester#Concept:_2_Tote_Biodigester