WRAP (the Waste & Resources Action Programme)

Home Composting Diversion: Household Level Analysis


Courtesy of Courtesy of WRAP (the Waste & Resources Action Programme)

The goals of the present study were to (i) verify Parfitt’s (2005) household-level models of home composting diversion, (ii) provide additional insight into how those diversion factors were derived, (iii) extend the modelling approach to consider garden waste in residual and garden waste collections, and (iv) track the performance of compost bins supplied by WRAP (Waste & Resources Action Programme) to households over a 16 month period. Parfitt’s (2005) household level models were verified as being a true representation of the data.

New regression models were constructed to better understand the performance of different home composting groups, to test the assumption that diversion factors are not seasonal, and to provide a better fit to the data, particular for garden waste. Diversion factors were produced for three groups of home composting households:

  • Non-WRAP home composters – those that home composted without a WRAP bin;
  • WRAP Enhanced – those households that composted prior to receiving their WRAP bin
  • WRAP New Recruits - those household that did not home compost prior to receiving their WRAP bin.

Analysis of waste composition and questionnaire data collected in 2004 from nine local authorities produced the following diversion factors (negative values indicate diversion and bold indicates significantly different from zero):

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