LFOM (LFOM)

Liquid Fermented Organic Manure (LFOM) is the liquid fraction of anaerobic digestate that has been further fermented or stabilised so that its nutrients — particularly nitrogen — are converted into plant-available, low-volatility forms. It is sold under FCO 1985 (amended 2021) as a registered liquid organic fertilizer, with a minimum NPK specification of 0.4% N + P + K on fresh basis, pH between 4.0 and 7.0, and pathogen counts below FCO limits (Salmonella absent in 25 ml, coliforms below 1,000 MPN/ml).

LFOM differs from raw liquid digestate in three ways. First, controlled secondary fermentation (typically 7–21 days in covered tanks with optional microbial inoculants) reduces residual BOD by 40–60% and stabilises the nutrient profile, preventing field emissions of ammonia. Second, optional acidification with citric or phosphoric acid drops pH to 5.5–6.0, locking ammonium into a non-volatile form and extending shelf life to 6–9 months. Third, filtration through 50–100 micron screens removes particulates that would clog drip irrigation emitters — critical because LFOM's main commercial channel is fertigation via drip and sprinkler systems.

For Indian CBG plants, LFOM addresses the long-distance transport problem that limits raw digestate. Packaged in 1-litre, 5-litre, or 20-litre HDPE bottles, LFOM ships through agricultural retail networks at ₹40–80 per litre, generating gross margins of 35–50% after bottling and distribution. A 10 TPD CBG plant that processes 30–40% of its liquid digestate into LFOM (10–12 KL per day) can add ₹2–4 lakh of daily revenue — meaningful against gas-sales-only economics. Trade-offs include the ₹40–80 lakh capex for fermentation tanks, filtration, and bottling line, plus FCO 1985 compliance overhead and brand-building cost to compete with established Indian liquid bio-fertiliser brands.

• Liquid fraction of digestate, secondarily fermented and stabilised for shelf life and field performance.
• FCO 1985 spec: minimum 0.4% N+P+K fresh basis, pH 4–7, pathogen counts below limits.
• Sold via fertigation channels (drip, sprinkler) at ₹40–80 per litre in retail packaging.
• Adds ₹2–4 lakh daily revenue to a 10 TPD CBG plant but requires ₹40–80 lakh additional capex.