Greywater challenge water: Systems treating laundry source water

Prepare the challenge water according to the following formula:

Wastewater components1 Amount/100 L
liquid laundry detergent (2X) 40 mL
test dust2 10 g
secondary effluent 2 L
raw influent screened to ≤ 1mm 1 L
liquid laundry fabric softener 21 mL
Na2SO4 4 g
NaHCO3 2 g
Na3PO4 4g
urea As needed to bring influent TKN within the specified range
NaOH As needed to adjust pH
HCl As needed to adjust pH
1 See Annex C for example products.

2 See ISO 12103-1, Road Vehicles – Test Dust for Filter Evaluation. The test dust shall meet the specification of ISO 12103-1, A2 – Fine test dust. A test dust that meets these specifications is available from Powder Technology, Inc. Inc., PO Box 1464, Burnsville, MN 55337. Source.