Fish Protein Liquid Fertilizer Production Line: Transforming Fish Waste into High-Value Nutrients

Fish waste is often considered a byproduct of the seafood industry, but in modern agriculture, it’s becoming a goldmine for sustainable fertilizer production. Through efficient processing technology, fish scraps, heads, and viscera can be turned into nutrient-rich organic fertilizer — known for its high nitrogen and amino acid content.

This is where the Fish Protein Liquid Fertilizer Production Line from LANE Heavy Industry comes in — an advanced solution for converting fish waste into valuable agricultural input.

Why Choose Fish Protein Liquid Fertilizer?

Fish-based liquid fertilizer is one of the most natural and effective bio-organic fertilizers available today.
Rich in amino acids, peptides, nitrogen, and micronutrients, it improves soil fertility and promotes faster plant growth.

Main advantages:

  • Fast nutrient absorption by plants

  • Enhances microbial activity in the soil

  • Improves crop quality and resistance

  • Eco-friendly and zero-waste production

  • Ideal for organic farming and high-value crops

With increasing demand for organic produce and sustainable practices, building a fish protein liquid fertilizer production line has become an attractive investment for aquaculture companies and fertilizer manufacturers.

How the Fish Protein Liquid Fertilizer Production Line Works

A fish protein liquid fertilizer production line transforms raw fish waste into stable, nutrient-rich fertilizer through enzymatic hydrolysis, filtration, and homogenization.
LANE Heavy Industry provides complete turnkey systems tailored to production capacity, raw materials, and desired nutrient composition.

Below is a typical process flow and the equipment involved:

1. Raw Material Collection and Pre-Treatment

Raw fish waste (heads, bones, scales, viscera) is collected from processing plants or fisheries.
It is crushed using a vertical shaft crusher to increase surface area for enzymatic breakdown.
Large impurities such as shells or debris are removed by a vibrating screen or filter mesh system.

2. Enzymatic Hydrolysis and Digestion

The crushed fish slurry enters the enzymatic hydrolysis tank, where controlled heating and specific enzymes break down proteins into amino acids and peptides.
This process typically runs at 45–55°C for several hours to achieve full conversion.

LANE’s hydrolysis tanks are equipped with:

  • Automatic temperature control

  • Agitators for uniform digestion

  • pH monitoring and adjustment system

This stage is the heart of the fish protein liquid fertilizer production line, turning waste into nutrient-rich liquid.

3. Solid-Liquid Separation

After hydrolysis, the mixture passes through a decanter centrifuge or screw press separator, which separates solid residues (fish bone, scales) from the liquid fraction.
The liquid portion, rich in dissolved amino acids and nitrogen compounds, proceeds to the next step.
Solid residues can be further processed into fish meal or compost — ensuring no material goes to waste.

4. Filtration and Purification

To ensure a clean, stable product, the liquid fertilizer passes through a dual filtration system consisting of:

  • Coarse filter (removes large particles)

  • Fine mesh filter (ensures smooth flow)

  • Optional activated carbon filter (removes odor and color)

The result is a pure, stable liquid fertilizer ready for concentration and blending.

5. Concentration and Blending

In this stage, the liquid is concentrated using a vacuum evaporator or stainless steel mixing tank to reach the desired nutrient density.
LANE’s system allows for optional addition of micronutrients, humic acid, or seaweed extract to enhance fertilizer performance.

6. Homogenization and Storage

A key part of the fish protein liquid fertilizer production line is the inline homogenizer, which ensures the fertilizer has uniform particle size and stable consistency.
This prevents sedimentation during storage and ensures smooth application in fertigation or spraying systems.
The homogenized product is then stored in chemical-resistant storage tanks with built-in mixers.

7. Automatic Filling and Packaging

The final product is filled into bottles, drums, or IBC containers using an automatic liquid filling and capping machine.
LANE’s packaging systems feature:

  • Precise filling accuracy

  • Adjustable filling speeds

  • Sealed caps to prevent leakage and contamination

Composition and Applications

Typical nutrient composition of fish protein liquid fertilizer:

ComponentPercentage Range
Organic Nitrogen5–8%
Amino Acids20–30%
Organic Matter40–50%
Micronutrients (Fe, Zn, Mn)0.2–1%

Applications:

  • Foliar spray on vegetables, fruits, and cereals

  • Fertigation through drip irrigation

  • Soil drenching for young seedlings

  • Compost enrichment for organic farming

Advantages of LANE’s Fish Protein Liquid Fertilizer Production Line

LANE Heavy Industry specializes in customized, automated systems that meet global standards.
Our fish protein liquid fertilizer production line is designed for:

  • High efficiency and low energy consumption

  • Corrosion-resistant stainless steel construction

  • PLC-controlled automation for consistent output

  • Modular design — easy to expand or upgrade

  • Complete technical support and installation guidance

LANE’s engineers have implemented similar projects in Indonesia, the Philippines, and Vietnam, where fish processing waste is abundant and local farmers are turning to organic fertilizer production.

Conclusion

The Fish Protein Liquid Fertilizer Production Line is a smart, eco-friendly solution that bridges the gap between aquaculture and agriculture.
By using advanced equipment like enzymatic hydrolysis tanks, filtration units, and inline homogenizers, it transforms waste into a liquid nutrient source that supports both soil health and crop productivity.

With its extensive experience and technical expertise, LANE Heavy Industry continues to help producers worldwide establish reliable, cost-effective fertilizer production systems — turning what was once discarded into sustainable growth for the future.

For more details, please feel free to contact us.

Henan Lane Heavy Industry Machinery Technology Co., Ltd.

Email: sales@lanesvc.com

Contact number: +86 13526470520

Whatsapp: +86 13526470520

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