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Quick start-up and quick steady-state techniques for UAFFB reactor.

M T Datar¹, D R Dubey, A N Singh

¹Ujjain Engineering College, Ujjain.

Indian Journal of Environmental Health

|October 25, 2002

Summary

This study introduces a novel technique to accelerate the start-up of Upflow Anaerobic Filter Fixed Bed (UAFFB) reactors. By pre-coating media with slime, reactor start-up time is reduced to just 15 days.

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Area of Science:

Environmental microbiology
Bioreactor engineering
Wastewater treatment

Background:

Anaerobic reactor start-up is typically lengthy (2-12 months) due to slow microbial growth and washout.
Anaerobes lack slime production, hindering biofilm formation on reactor media.
Aerobic slime can serve as an attachment matrix for anaerobic biomass.

Purpose of the Study:

To develop a method for reducing the start-up period of anaerobic reactors.
To enhance anaerobic biofilm formation on fixed-bed reactor media.
To investigate the efficacy of a slime-based inoculation technique.

Main Methods:

Pre-coating fixed-bed media with an aerobic slime layer.
Introducing acclimated anaerobic biomass to the slime-coated media.
Operating laboratory-scale Upflow Anaerobic Filter Fixed Bed (UAFFB) reactors at high organic loading rates.

Main Results:

The novel 'Start-up Technique' significantly reduced UAFFB reactor start-up to 15 days.
High organic loading of 5.95 kg COD/day/m³ was achieved during the reduced start-up period.
The 'Steady-state Technique' established stable conditions within 15 days at 7.66 kg COD/day/m³.

Conclusions:

Pre-seeding with slime effectively accelerates anaerobic biofilm development.
This method drastically shortens reactor start-up times, improving efficiency.
The technique is viable for rapid establishment of high-rate anaerobic wastewater treatment systems.

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