What is BS EN 14701-2 ‒ Filtration properties of sludges about?  
BS EN 14701-2 is the second part of the multi series standard that specifies a method for determining the specific resistance to filtration of conditioned and non-conditioned sludges, provided that no sedimentation occurs during filtration (i.e. single phase suspension with particles in suspension).
BS EN 14701-2 is applicable to sludges and sludge suspensions from:
- Storm water handling
- Urban wastewater collecting systems
- Urban wastewater treatment plants
- Industrial wastewater that has been treated similarly to urban wastewater (as defined in Directive 91/271/EEC)
- Water supply treatment plants
BS EN 14701-2 is also applicable to sludge and sludge suspensions of other origins.
Who is BS EN 14701-2‒ Filtration properties of sludges for? 
BS EN 14702 on filtration properties of sludges is useful for entities dealing with: 
- Wastewater collecting systems 
- Wastewater treatment plants 
- Plants treating industrial wastewater 
- Water supply treatment plants  
Why should you use BS EN 14701-2‒ Filtration properties of sludges? 
In wastewater treatment plants, sludge thickening occurs in the lower layers of clarifiers and in separate thickening tanks. Due to wide variation in sludge filtration properties, design criteria for these processes are mostly based on batch thickening tests. A number of parameters have been developed to obtain a quantitative measure of the settleability of sludge. 
BS EN 14701-2 characterizes a test that can be easily performed and has widespread use in routine process control for sludge quality comparison in filtration tanks. It gives you the procedure for the use of indexes for sizing/optimizing decanters and static thickeners and talks about the care with which they should be handled. It also tells you about the influence upon indexes, by laboratory artefacts, i.e., channelling and bridging effects, turbulences caused by filling, shallow depth by partial support through the solids from the bottom to the vessel, the impact of stirring on sludge. 
BS EN 14701-2 provides you with the measures for determining the filtration properties of sludges, that can help you evaluate the impact of sludge chemical conditioning on the size and design of the thickener or on the process productivity. This is further helpful for you as a decanter/thickener well-sized will can enable sludge treatment as the lowest cost for its volume reduction.
