Overview
Biofloc calcium hydroxide is a high-purity variant of calcium hydroxide specifically formulated for aquaculture biofloc technology (BFT) systems. Unlike standard hydrated lime, it undergoes additional purification to remove contaminants harmful to aquatic life. This compound plays a dual role in biofloc systems: maintaining optimal pH levels (7.5-8.5) and providing calcium ions essential for microbial floc formation. Its controlled solubility makes it ideal for gradual alkalinity adjustment in recirculating aquaculture systems (RAS).
Physical and Chemical Properties
The material exhibits a fine particle size distribution (typically 80-150 mesh) for uniform dispersion in water. Its high surface area (15-25 m²/g) enhances reactivity with carbon dioxide, a critical process in biofloc systems. Unlike agricultural lime, biofloc-grade calcium hydroxide has strict limits on impurities: <0.1% magnesium oxide, <0.01% heavy metals, and <0.5% acid-insoluble matter. These specifications prevent toxicity to shrimp and fish while supporting beneficial bacterial growth.
Main Applications
In intensive shrimp farming, it's used for daily pH maintenance (0.5-2 ppm doses) and emergency alkalinity boosts during microbial blooms. The compound also precipitates phosphates, controlling algal growth in heterotrophic systems. Recent applications include biofloc starter cultures, where it accelerates floc formation by 30-40% compared to sodium bicarbonate. Some integrated multi-trophic aquaculture (IMTA) systems use it to balance water chemistry between fish and shellfish compartments.
Safety and Storage
Industrial users must store bulk quantities in silos with desiccant systems to prevent caking. On-site slurry preparation requires corrosion-resistant mixers (316L stainless steel or HDPE). Workers handling dry powder require NIOSH-approved N95 respirators and chemical goggles. Spill response kits should include pH-neutralizing agents (e.g., citric acid) and containment materials. Unlike food-grade calcium hydroxide, biofloc variants aren't FDA-approved for human contact.
B2B Procurement Guide
Reputable suppliers provide batch-specific heavy metal analysis certificates (As <2 ppm, Pb <5 ppm). For large aquaculture operations, bulk purchases (20+ metric tons) typically include free technical support for dosage calculations. Key procurement considerations include: 1) Verification of bioavailable calcium content (>92% Ca(OH)₂), 2) Packaging options (moisture-proof bags vs. super sacks), and 3) Logistics compatibility with slurry dosing systems. Seasonal demand fluctuations may affect lead times during peak aquaculture cycles.
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