Treatment of effluent from vegetable production using a lamella separator

For the production of canned vegetables the amount of effluent and soiling varies a lot throughout the season. The high fluctuations led, beside the high wastewater costs, to problems in the municipal biological-effluent-plant.

In order to limit the pollution loads and decrease the peak loads a pre-separation was to be installed.

Technical details

Clarifying area: 100 m²
Lamella spacing: 40 mm
Housing / lamella material: coated steel / Polypropylene
Additional equipment: rabble rake, frost protection, mud cone

Performance characteristics

Vegetable output: 40.000 t/a (6 t/h)
Processing products: carrots, spinach, peas, beans, cauliflower, onions, Brussels sprout
Rate of the pre-treatment system: 75 m³/h
Max. Influent concentration: 20,000-40,000 mg/l CSB
Required discharge concentration: max. 2,000 mg/l CSB

Chosen processes

1. Dewatering screw
2. Lamella separator
3. Biological treatment with sludge recirculation

With the dewatering screw coarse material (larger 1mm) gets exported and dewatered at the same time.

The lamella separator separates the finer dirt particles. The particles / sludge-flocs settle onto the lamellas, slide into the sludge funnel and get exported by a pump. The last purification step is a biological treatment process with aeration. The accruing sludge is led back into the lamella separator.

Due to this process the required effluent values could be met reliably. As for example the for the production of carrots, the CSB-value was reduced from 16.000 to 1.300 mg/l. Leiblein GmbH delivered the lamella separator for the process.

Lamella separators for the purification of effluent from vegetable production – an ecological solution!

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