Biofloc system

Complex for growing on biofloc: aeration, carbon dosing, control of suspension and buffers - a stable microbial community without water discharge.

target C:N 12–18:1 TSS 200–600 mg/l settleable 5–15 ml/l DO ≥ 5 mg/l alkalinity 120–200 mg/l CaCO₃

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Control: C:N, ORP, TSS
Suitable: shrimp, tilapia, catfish
Saving water: up to 90%

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Microbial Ecosystem Management

What does the complex solve?

Maintenance C:N 12–18:1 for ammonia binding by heterotrophs.
Distributed aeration and microbubbles - keeping flocs in suspension, high DO.
Online monitoring TSS/turbidity, ORP, pH, alkalinity with trends.
Techniques for starting/restarting and quickly extinguishing nitrite outbreaks.

Equipment

Aeration lines with fine bubble diffusers, backup compressor/oxygen.
Dosing pumps for carbon sources (molasses/dextrose/vinegar, etc.) and buffers (NaHCO₃).
Online ORP, pH, DO, turbidity/TSS sensors; point of manual selection on the Imhof cone.
Control panel with PID algorithms and operation/alarm log.
Sidestream clarifier/sludge collection cones for suspended matter control.

How biofloc works and what goals to keep

Principle

When carbon is added, heterotrophic bacteria quickly consume ammonium, forming flocs - a nutritious “super food”. The secret of success is stable oxygen, buffering and the amount of suspension.

DO ≥ 5 mg/l (feeding/night - air/oxygen reserve).
pH 7.2–8.0; alkalinity 120–200 mg/l CaCO₃ (addition of NaHCO₃).
ORP ~ 0...+150 mV - moderately oxidizing environment, without a “swamp”.
TSS 200–600 mg/l; settleable solids 5–15 ml/l (according to Imhof, 1 l/15 min).

Carbon dosing algorithm

We estimate the nitrogen input: protein in feed × excretion coefficient → grams N/day.
Select source C and take into account carbon content (molasses ~45–50% C, dextrose ~40–45% C).
We aim for C:N 12–18:1 by mass - start in small portions with correction for NO₂⁻/TSS.
Interblocking: high NO₂⁻ → C-dose priority; high TSS → reduction in C and sludge removal.

The exact calculation for biomass/feeding is in the mode passport, we can build in a mini-calculator.

Suspension control and clarification

Sidestream clarifier/conical collectors with adjustable sludge blowing.
Selection point at Imgof-cone, settleable solids and TSS magazine, auto-tips on drains.
Foam traps/skimmers for the “turbulent” stages of the start.

Options and integration

Integration with automatic feeders (combination of C-dose and feeding profile).
Mobile biofloc “starter modules” for new sites.
Remote support from a technologist 24/7 and weekly trend audits.

Frequently asked questions

How do you know if C:N is configured correctly?

NO₂⁻ does not accumulate, ORP is stable, TSS and settleable are within target limits, foam is moderate. If NO₂⁻ increases, add C and aeration; if TSS/settleable is high, we lower C and remove the sludge.

Which is better quality carbon?

It is technologically advanced to work with molasses/dextrose: they are predictable and safe. We take into account the actual %C and adjust the doses; We evaluate the effect on pH and alkalinity.