Technical Issues and Design criteria
- 1. Technical Selection Issues
-
· Know the regulations - treatment standards and design requirements.
· Evaluate flows, loads, and peaking factors carefully ? the size and cost of the plant will directly relate to flows, loads, and peaks.
· Consider an equalization tank to optimize treatment ? membrane is a barrier, therefore need to design for the peak flow.
· Evaluate the whole life cost of each viable option.
· Consider the complexity of O&M and who will manager.
· Volume of sludge produced
· Footprint, visual impact, noise and odour.
· Phased construction.
- 2. Design Criteria
· Design Criteria, 12,000mg/L
· Design Sludge Age, 20 to 30 days
· Typical Design Flux, 15gpd/ft2 or 25l/m2h
· Relaxation Period, 5mins/hr
· Permeate Recycle for Low Flow Periods
· Estimated Membrane Replacement Period 7 to 10 years