Trap designs: a. Tube technique; b. Stinger ring technique; c. Off-body flow split technique; 1 – waste header; 2 – body; 3 – discharge tube; 4 – sorbent layers; 5 – supply tube; 6 – feeding header; 7 – perforated rings; 8 – drain channel; 9 – perforated flow split walls; 10 – partitions; 11 – distribution channels.