[Digestion] Help needed

[Kshanika Goonesekera]

Hi All, 

 

I am in Sri Lanka where industries are starting to look at the
advantages of converting their sewage and kitchen waste treatment plants
to biogas plants. My question is; 

*	Can it be guaranteed that this slurry is free of all sewage
pathogens and hence can be safely used as fertilizer? 

 

The contractor has recommended secondary aerobic treatment to the
slurry; 

*	Does the slurry leaving the AD require secondary aerobic
treatment?  
*	Is the BOD, COD content of the slurry adequate for aerobic
treatment with MLSS of 1500-3000?

 

The employers are not keen on using the slurry as fertilizer due to the
chance that pathogens can exist. Hence, the agreement to send the slurry
through aerobic treatment and then into an inland surface waterbody. 

 

Best regards

Kshanika Goonesekera

Sri Lanka

 

 

 

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