TTHMs in wastewater 2

[blurt8]

We've switched from glycerin as a food supplement for wastewater bugs to natural BOD by adjustments to our primary settling basins. TTHMs in our effluent have spiked to over 100ppb and are regulated for aquifer recharge and direct potable reuse. Could it be that natural BOD has much more TTHM potential vs. glycerin. I don't think chlorine reacts with glycerin to form THMs...may form chlorhydrins. Chlorine reacting with natural BOD as opposed to glycerin may be the cause of our TTHM problem?

 

[ashtree]

Blurt

Its a matter of what is getting carried through to the effluent to be chlorinated. THMs are typically caused by the chlorination of organic matter. Most likely you have more BOD in the effluent than what you had when you were feeding glycerin. A TOC/DOC test of the effluent when using the 2 different food sources would help you investigate this. It maybe that a period of acclimatization or some simple adjustments such as changes to SRT or operating dissolved oxygen levels may solve or reduce your problem. Reducing the amount of BOD being fed may also be possible.



Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

 

[bimr]

The glycerin is a sugar alcohol and should not make TTHM's like BOD and organics do. The sugars will be easily consumed by the microorganisms. Compare the TOC levels in the effluent from using glycerin or BOD.