New CPD explores factors around wastewater treatment

GRAF UK has launched a new 50-minute CPD that explores the issues around wastewater treatment and advises on potential options available for specifiers.

The resource discusses the fundamentals through to the latest regulations and issues via a mix of ‘live’ presentation and videos.

The CPD explains the differences between cesspools, septic tanks and wastewater treatment plants before demonstrating advanced systems for optimum treatment, such as SBR (Sequence Batch Reactor) systems which are said to be capable of cleaning wastewater to 98% in just six hours.

It also explains the pollution strength of sewage and how Graf systems are capable of reducing the average levels of BOD (Biochemical Oxygen Demand) from 300-400mg/l to just seven, suspended solids from 200-300mg/l to 14mg/l, and ammonia (nitrogen compound) from 60-80mg/l to 0.5mg/l.

The CPD goes on to explore processes including de-nitrification, disinfection, phosphate removal and carbon dosing. This latter process helps housing developments deal with sewage underload as population increases.

A video explains the new General Binding Rules under which anyone with a septic tank discharging into a watercourse must have plans in place to replace or upgrade the foul water solution within a reasonable timescale – typically 12 months – or sooner if the property is sold before this date.

The CPD concludes with the case study of a family attraction in a SPA (Special Protection Area) in Scotland that required a new sewage treatment solution that Scottish Environment Protection Agency (SEPA) required to deliver phosphate levels of 2mg/l, and 0.2mg/l.

Click here to sign up to watch the full CPD or go to