UKTC Archive

RE: Biodisc effluent - impact to trees?

Subject: RE: Biodisc effluent - impact to trees?
From: Rupert Baker
Date: Dec 21 2017 18:30:05
Dear Andrew,
At those levels of solids and nitrate etc, no worries;  more to the point, 
will 1-2 000 litres of water/day saturate the ground and lead to root-death?  
Is it being discharged into a swale, and if so, at what depth below original 
soil surface? What is the infiltration rate of the soil? You need answers to 
these sort of questions first
Happy Christmas

-----Original Message-----
[] On Behalf Of Igoea, Andrew
Sent: 21 December 2017 10:20
To: UK Tree Care <>
Subject: Biodisc effluent - impact to trees?

Hi All,

Has anyone had experience with assessing the impact of discharging biodisc 
effluent (treated sewage) into the rooting zone of trees?

The treated effluent will contain 10mg/L suspended solids and 3.8mg/L 
ammonia, and will have a BOD of 10mg/L. The output could be between 1-2 cubic 
metres per day.

The treatment facility is at the top of a steep bank and the trees are below 

I know the proposal will impact the moisture content and chemical composition 
of the soil, which could impact the mycorrhizal associations and soil fauna, 
but will it have a significant detrimental impact on the trees?


Andrew Igoea  | Arboricultural Officer
Forestry, Amenity and Lands Directorate | Department of Environment, Food and 
Agriculture Thie Slieau Whallian | Foxdale Road | St Johns | Isle of Man | 
TEL:  (+44) 01624 XXXXXX | MOB: (+44) 07624 XXXXXX | E-MAIL:<>

Isle of Man. Giving you freedom to flourish

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