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Journeys on a Limping Mule. What We Know About Bioreactors. One who knows and knows that he knows... His horse of wisdom will reach the skies. One who knows, but doesn\'t know that he knows... He is fast asleep, so you should wake him up!

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slide1

Journeys on a Limping Mule

What We Know About Bioreactors

slide2

One who knows and knows that he knows... His horse of wisdom will reach the skies.

  • One who knows, but doesn\'t know that he knows... He is fast asleep, so you should wake him up!
  • One who doesn\'t know, but knows that he doesn\'t know... His limping mule will eventually get him home.
  • One who doesn\'t know and doesn\'t know that he doesn\'t know... He will be eternally lost in his hopeless oblivion!

Ibn Yamin Faryumadi (1286-1368)

slide3

UU

KU

KU

KK

KK

UK

UK

slide4

KK

KU

UK

slide6

Why Bioreactors ?

  • Proven technology
  • Requires no modification of current practices
  • No land taken out of production
  • No decrease in drainage effectiveness
  • Very low maintenance
  • Estimated life - 10 to 15 years
  • Cost effective
slide7

Corncob Mix data points

Wood mix data points

Corncob Mix fittedline

Wood Mix fitted line

CD=68%

Concentration of Nitrate-N (mg/L)

Hydraulic Retention Time (mins)

Removal Efficacy is a Function of Oxygen Saturation, Carbon Source and Retention Time

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100

20c

50c

80

Measured Points (2oC)

% Nitrate Remaining

60

100c

Concentration of Nitrate-N (mg/L)

150c

40

20

200c

250c

Hydraulic retention time (mins)

Removal Efficacy is a Function of Temperature

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Diversion

Structure

Second Generation Bioreactors

Length/width dependent on

contributing area

5’ Soil

Backfill

Capacity

Control

Structure

Section

of perforated

tile

Trench bottom 1’

Below tile invert

Woodchips

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5’ Soil backfill

Top View

5’ section of non-perforated tile

Diversion

structure

Capacity control

structure

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Combination

structure

5’ Soil backfill

Perforated tile

Non-perforated tile

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60 minutes after injection

120 minutes after injection

slide15

Dissolved MeHg in Bioreactor Inlets

-Eight non-detects

-Six samples contained detectable MeHg

- Maximum: 0.16 ng/L

- Average: 0.09 ng/L

slide17

Diversion

Structure

Third Generation Bioreactors

Length/width dependent on

contributing area

5’ Soil

Backfill

Capacity

Control

Structure

Section

of perforated

tile

Trench bottom at the

tile invert level

Woodchips

slide21

Plastic Liner

Solid pipe

Perforated pipe

Perforated pipe

Solid pipe

Phosphorus Removal Chamber

slide31

Thank

You!

Richard Cooke

Department of Agricultural and Biological Engineering

University of Illinois

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