Application Scenarios of Decanter Centrifuge in Lactic Acid Fermentation Broth Separation
Decanter Centrifuge in Lactic Acid Fermentation Broth Separation
Table of Contents
2026-10-26
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- Pre-separation of saccharification mash residue (pre-treatment before fermentation) After saccharification of corn / cassava starch, the mash contains crude fiber, unconverted starch particles and protein suspension. The decanter separates and dewaters crude residues in advance to avoid fiber accumulation inside fermenters. Residual sugar trapped in cake can be recovered via cake washing.
- Primary clarification & biomass separation of fermenter discharge (core application) The lactic acid broth from fermenter contains lactic acid bacteria, protein colloid and fine fiber. As the first-stage separation equipment, the decanter continuously removes most bacterial biomass and coarse suspended solids. The overflow supernatant is sent to disc separator for fine polishing. This “decanter + disc” combination is a classic process for lactic acid / PLA production lines.
- Counter-current cake washing for entrapped lactic acid recovery (yield improvement) A washing zone is integrated on the scroll. Washing water sprays the cake counter-currently to strip free lactic acid trapped inside the solid cake, recycle lactic acid back to liquid phase, reduce product loss and improve overall lactic acid yield.
- Deep dewatering of biomass residue, waste reduction and resource utilization The separated bacterial cake can be dewatered to 75~78% moisture. Reduced cake volume facilitates transportation. The dewatered biomass can be reused as protein feed or organic fertilizer raw material, cutting solid waste disposal cost.
- Pre-treatment protection before ultrafiltration and ion exchange Coarse fiber and large bacterial particles are removed by decanter to avoid blockage of UF membranes and resin columns. It reduces membrane cleaning frequency and resin fouling, extends service life of consumables and stabilizes the lactic acid purification process.
- Secondary separation of cake washing filtrate and process recovery water Wash liquor, tank cleaning wastewater and floor drainage containing residual biomass and fine solids can be treated by decanter to recover leftover lactic acid and lower COD load for the wastewater treatment station.
- High-flow buffer separation for batch fermentation discharge For traditional batch fermentation with concentrated discharge and fluctuating feed load, the decanter tolerates variable solid content well. It replaces plate-and-frame filter press and greatly cuts labor cost.
- Separation for high-solids lactic acid fermentation broth For high-substrate concentration fermentation routes with high feed solid content, disc separators are prone to overload and frequent sludge discharge. Decanter is suitable for stable continuous separation of such high-solid slurry.
- Bacterial strain concentration and recycling (for selected processes) For certain processes requiring strain reuse, the decanter concentrates bacterial slurry, which can be recycled back to the fermenter system to reduce seed culture cost.
- Separation under emergency bypass condition It can serve as emergency bypass equipment. When disc separators or filters are under maintenance, the decanter can run independently for solid-liquid separation to keep the production line running.
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