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WATER I NNOVATE Tom Stephenson Steve Callister Wastewater Network Meeting 25 th May 2006.

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Presentation on theme: "WATER I NNOVATE Tom Stephenson Steve Callister Wastewater Network Meeting 25 th May 2006."— Presentation transcript:

1 WATER I NNOVATE Tom Stephenson Steve Callister Wastewater Network Meeting 25 th May 2006

2 2 Summary Nitrogen cycle and N 2 0 N-Tox ® Case Study – municipal Case Study – industrial Case Study – pilot plant Conclusions

3 3 Who are we? –Spin out business from Cranfield University What do we do? –Identify, develop and commercialise innovative technology for the water and wastewater market

4 4 Products odour modelling software nitrification toxicity monitor water treatment coagulant membrane chemical reactor odour control reactor nite/denite reactor

5 5 Nitrogen Cycle N2N2 N2ON2O NO NH 3 NH 2 OH NO 2 - NO 3 - DenitrificationNitrification Fixation

6 6 N 2 O Formation NO 2 - N 2 O nitrite reductase NO 2 -, NH 2 OH chemical decomposition Formed during nitrification and denitrification

7 7 Causes –Loss of aeration –Ammonia overload –Toxic chemicals Methods for nitrification toxicity detection –Effluent NH 3, NO 2 -, NO 3 - monitors –On-line respirometers –Laboratory respirometers –Microbial methods Nitrification Inhibition

8 8 N-Tox ® relies on gas phase detection of nitrous oxide rather than a chemical in the aqueous phase. N-Tox ®

9 9 N-Tox ® - Alarm Mode Inhibition event detected by presence of N 2 O in off gas. Ammonia Into River N 2 O Peaks Early Warning

10 10 N-Tox ® - Diagnostic Mode Nitrification failure mode indicated by shape of curve. N 2 O (greenhouse gas) emissions indicated by area under curve.

11 11 N-Tox ® Applications Municipal or industrial treatment plants Plants with stringent ammonia discharge consents Plants susceptible to toxic chemicals in influent e.g. leachate or pharmaceutical wastes Plants with high ammonia loadings (e.g. sludge liquor returns) Plants with history of inhibition problems

12 12 N-Tox ® Outputs Alarm giving early warning of nitrification failure Diagnostic tool for process optimisation & control Device for quantifying N 2 O greenhouse gas emissions

13 13 N-Tox ® - The Apparatus Innovative design comprises: integral sample pump gas conditioning device non-dispersive infra red (IR) gas analyser auto-calibration system data logging unit IP65 rated enclosure Floating Sample Hood Tubing ASP

14 14 N-Tox ® - Unique Benefits Real time response allowing proactive management Robust, non invasive technique Simple, low cost technology No chemical reagents

15 15 Municipal Case Study 5 m 0 m Anoxic zone Operating Parameters MLSS: 2941 – 3555 mg.l -1 MLpH: 6.75 – 7.23 DO: 2.0 – 7.4 Temp: 18.6 – 21.3 ºC

16 16 Municipal Plant – Aeration Lane Sample Points Direction of flow Anoxic Zone 0 5 10 15 20 25 Distance from anoxic zone

17 17 StageNH 3 -NCOD Influent (mg.l -1 )29.8 – 65.8156 – 940 Effluent (mg.l -1 )0.1 – 0.626 – 72 Removal (%)97.6 – 99.886.0 – 90.7 Municipal Plant Performance

18 18 Municipal Aeration Lane N 2 0 Profile

19 19 Industrial Plant Aeration Tank

20 20 Industrial Plant Schematic Stage one Anoxic tank Clarifier Stage two Clarifier Influent Final effluent Off-gas Influent WAS RAS Samples

21 21 Stage 1 Performance MLSS 3700 – 7100 mg.l -1 MLpH 5.84 – 7.30 StageNH 3 -NCOD Influent (mg.l -1 )488 – 8589810 – 20300 Effluent (mg.l -1 )248 –520768 – 2748 Removals (%)2.5 – 69.674.8 – 87.2

22 22 Stage 1 N2ON2O

23 23 Stage 2 Performance MLSS 2360 – 3900 mg.l -1 MLpH 6.37 – 7.01 StageNH 3 -NCOD Influent (mg.l -1 )248 – 520768 – 2748 Effluent (mg.l -1 )1 –13732 – 1488 Removal (%)98.89 – 99.9529.3 – 73.6

24 24 Stage 2 NO,

25 25 Denitrification Influent StageNH 3 (mg.l -1 )COD (mg.l -1 ) Influent488 – 8589810 – 20300 MLSS 2760 – 4820 mg.l -1 MLpH 6.97 – 8.02

26 26 Denitrification N2ON2O 0 500 1000 1500 05101520 Time (h) ppm

27 27 Annual NO x and N 2 0 Emissions StageNO (kg/yr)NO 2 (kg/yr)N 2 O (kg/yr) 127383733442 259711134368 Denitrification730.73212

28 28 Activated Sludge Pilot Plant Lab N 2 O analyser ClarifierAeration Tank

29 29 Pilot Plant Operating Parameters MLSS 2,000 – 2,500 mg/l MLpH ranged 6.53 – 7.2 COD removals 55.0 to 85.0 % Performance Effluent COD 27 – 49 mg/l Effluent SS 12 – 35 mg/l NH3 removals 97.2 – 99.6 % Effluent NH3 0.1 – 0.6 mg/l Performance as expected for a full-scale plant

30 30 Pilot Plant – Loss of Aeration ProblemAlarm Failure

31 31 Pilot Plant – Ammonia Shock Loads Ammonia shock load of 7.25g NH 3 CL ≈ instantaneous oxygen demand 3.5 mg/l. N-Tox ® provides early warning of nitrification failure several hours before ammonia appears in final effluent.

32 32 Pilot Plant – Phenol Shock Loads 75% inhibitory phenol shock load at MLSS of 1340 mg/l. N-Tox ® provides early warning of nitrification failure. 75% inhibitory phenol shock load at MLSS of 3270 mg/l. No response from N-Tox ® as nitrification is unaffected.

33 33 Pilot Plant – Phenol Shock (cont) Phenol shock load 4x minimum inhibitory concentration. N-Tox ® provides early warning of nitrification failure as effluent nitrite continues to rise.

34 34 Pilot Plant – Allythiourea (ATU) Shock Loads Allylthiourea (ATU) shock load at 75 % of reported minimum inhibitory concentration. No inhibition detected by N-Tox ® and no increase in effluent ammonia or nitrite. Allylthiourea (ATU) shock load at x 10 of reported minimum inhibitory concentration. N-Tox ® provides early warning of nitrification failure.

35 35 Pilot Plant – Sodium Azide Shock Loads Sodium azide shock load at 75 % of reported minimum inhibitory concentration. N-Tox ® provides early warning of nitrification failure several hours before nitrite appears in the effluent.

36 36 N-Tox ® - Conclusions N 2 O is a reliable “real time” indicator of nitrification failure N-Tox ® provides a robust, non-invasive device for measuring N 2 O N-Tox ® can act in a simple monitor/alarm mode (allowing time for corrective action) N-Tox ® can act in a diagnostic mode (allowing failure analysis and process optimisation) N-Tox ® can also be used to quantify greenhouse gas emissions from wastewater treatment plant


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