Description: WET_June_2021
One of the first things that should be done to troubleshoot a noncompliant system is to characterize the environments in each tank by performing a nutrient profile. This involves measuring ammonia, nitrate, and orthophosphate in grab samples taken from the outlet of each tank. With the help of a portable multiparameter photometer, the chemical results can be known in less than 2 hours.
PublisherWater Environment Federation
Word count271
Description: WET_June_2021
I was invited to the Village of Bradford, Ohio, because their 4-year-old BNR facility was having trouble meeting its effluent total phosphorus (TP) limit. The WRRF had been out of compliance for all but 9 months its first 53 months of operation.
PublisherWater Environment Federation
Word count1,131
Description: WET_June_2021
Another system that suffered from this condition and from noncompliance with a total phosphorus limit is the city of Niles, Ohio.
PublisherWater Environment Federation
Word count381
Description: WET_June_2021
I have been able to use this same mixer pattern — 3.5 hours off and 0.5 hours on — at other systems. Because this works, I believe that the “sweet spot” for fermenting mixed liquor must be wide. This pattern is a good starting point to achieve orthophosphate release when the influent has low soluble carbon, but operators should experiment at their facilities to find their...
PublisherWater Environment Federation
Word count211
Description: WET_June_2021
A recent innovation to overcome carbon limitations is sidestream enhanced biological phosphorus removal (S2EBPR). In S2EBPR, a stable source of readily biodegradable COD (rbCOD) is generated by fermenting RAS or mixed liquor. Several S2EBPR configurations are shown in Figure 1 (above). An important feature of S2EBPR is that it can be easily retrofit into existing facilities with conventional EBPR...
PublisherWater Environment Federation
Word count209