Grey water treatment in stacked multi-layer reactors with passive aeration and particle trapping.

When adequately treated, grey water represents a potent alternative water resource, as it constitutes a large proportion of household wastewater. The objective of this paper was to test a full scale version of a novel compact grey water treatment technology, based on passive aeration and particle trapping in multiple layers. Using a modified dual porosity filtration technology, grey water from a public bath was passed through a stack of eight reactors, each 0.75 m × 0.55 × 0.22 m, serially connected for gravity driven flow from top to bottom in a zig-zag pattern. The topmost reactor served as pre-filter for removal of hair and other larger debris. The lower seven reactors facilitated degradation of bulk organic contaminants in biofilm established on a stack of five fibrous polyamide nets, and trapping of particles by sedimentation on five interlaid corrugated plastic plates. By operating the reactors in a time-controlled batch-mode, the corrugated plates further served to trap air and thus ensure passive aeration of the subsequent batch. The production rate was 1.2 m

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