Sulfur denitrator experiment

[Delphinus]

Day 6 Readings:

Tank pH - 8.2
Tank NO3 - 75ppm (Salifert)

Stage 1 effluent pH - 7.3
Stage 2 effluent pH - 7.6

Stage 2 effluent NO3 - 50ppm (Salifert)

Just to eliminate "testing error" (since I only did one sample for each reading above) I'll test NO3 again tomorrow using a different test kit. The original readings I took, were done with an Elos NO3 test kit, so that's what I'll use again tomorrow to see if I can confirm the apparent reduction already at this point.

Anyhow this is interesting stuff. Just under a week and the effluent coming out of the reactor appears to have a lower nitrate value than the inflow. The second stage, for buffering the low pH output of stage 1, does appear to have some function although not as profound as one might like (0.3 difference? better than nothing I suppose). Really is there a difference between dumping 7.3 into your tank versus 7.6? The drip rate is about 1 drop per 1-to-2 seconds so it is a very slow throughput.