Liquid Fertilizer Fermentation Tank

The liquid fertilizer fermentation tank is the process core of a liquid organic fertilizer or biofertilizer plant. It is where organic raw materials, water, and beneficial microorganisms are combined under controlled temperature, mixing, and gas conditions to produce stable, nutrient-rich liquid fertilizer.

LANE Machinery builds SS304 and SS316L fermentation tanks from 500 L to 50,000 L, with insulated and jacketed bodies, variable-speed agitation, defoaming, dosing ports, PLC monitoring, and CIP-ready design. The tank can be supplied as a single machine or integrated into a complete liquid organic fertilizer production line with filtration, sterilization, storage, and filling.

Product Overview

The LANE liquid fertilizer fermentation tank is a sealed or vented stainless steel vessel designed for aerobic and anaerobic fermentation of organic liquids. It is used to convert livestock manure liquid, biogas slurry, compost extract, fish waste, seaweed extract, and other organic raw materials into liquid organic fertilizer and biofertilizer.

The tank combines the functions of a reactor and a storage vessel: it maintains the temperature, mixing, and gas conditions that microbes need, then holds the fermented liquid until it is ready for the next process step.

Fermentation tank design is customized by capacity, heating method, agitation type, aeration requirement, and control level. SS304 is suitable for most organic liquid fertilizer processes; SS316L is recommended for acidic formulas, high-chloride raw materials, and processes that require stronger corrosion resistance.

Features and Advantages

Corrosion-resistant stainless steel construction

• Wetted parts are available in SS304 or SS316L stainless steel.
• SS316L provides stronger resistance to organic acids, chloride ions, and aggressive fermentation liquids.
• Internal surfaces are polished to reduce residue, biofilm buildup, and contamination.
• Material certificates can be provided for traceability and third-party inspection.

Temperature control for stable microbial activity

• Jacket, heating coil, or external heating options.
• Steam, electric, or hot water heating matched to plant utilities.
• Insulation keeps the fermentation temperature stable and reduces energy loss.
• Typical mesophilic fermentation temperature is 30C to 40C, with controller and alarms.

Variable-speed agitation

• Flat, angled, or curved blades selected by raw material and process.
• Gentle, continuous mixing keeps microbes in contact with organic matter.
• Variable frequency drive prevents excessive shear that can damage microbial activity.
• Mixing prevents stratification and speeds up fermentation.

Aeration and gas management

• Sealed configuration for anaerobic fermentation.
• Aeration system option for aerobic fermentation.
• Gas outlet and pressure vent prevent pressure buildup.
• Defoaming system controls foam generated by organic materials.

Dosing and process control

• Dosing ports for microbial inoculants, nutrients, pH regulators, and additives.
• Temperature, pH, and level sensors feed data to the control system.
• PLC and HMI support recipe storage, batch repeatability, and data logging.
• Optional remote monitoring for plants with limited local engineering support.

Cleanable and safe design

• Manway, sight glass, sampling port, and bottom discharge as standard.
• Optional CIP spray balls for cleaning between batches.
• Emergency stop, temperature alarms, and level protection.
• Five-year warranty, spare parts, and overseas installation support.

Working Principle

The working principle of the liquid fertilizer fermentation tank is to create and maintain the conditions in which beneficial microorganisms decompose organic matter and convert it into available plant nutrients.

A typical fermentation batch works as follows:

1. Pretreated liquid organic raw material is pumped into the fermentation tank.
2. The tank is heated to the target fermentation temperature, usually 30C to 40C.
3. Beneficial microorganisms, such as compound Bacillus, lactic acid bacteria, or enzyme preparations, are added through the dosing port.
4. The agitator keeps the liquid uniform and prevents solids from settling.
5. For anaerobic fermentation, the tank is sealed and gas is vented through the gas outlet. For aerobic fermentation, the aeration system supplies oxygen.
6. Temperature, pH, foaming, and level are monitored and controlled during the fermentation cycle.
7. After 3 to 15 days, depending on raw material and process, the fermented liquid is discharged to filtration, sterilization, or ingredient mixing.
8. The tank is rinsed or cleaned with the CIP system before the next batch.

The result is a stable liquid organic fertilizer with better nutrient availability, lower pathogen risk, and more consistent quality than unprocessed raw organic liquid.

Application in a Liquid Organic Fertilizer Production Line

The fermentation tank is the central unit of a liquid organic fertilizer production line:

Raw material collection -> Solid-liquid separation -> Filtration -> UV sterilization -> Fermentation tank -> Ingredient mixing -> Storage tank -> Filling

In this configuration:

• Solid-liquid separation extracts the liquid fraction from manure, biogas slurry, or plant waste.
• Filtration removes large solids before fermentation.
• UV sterilization reduces harmful bacteria and pathogens.
• The fermentation tank carries out the main biological conversion.
• An ingredient mixing tank adds NPK, humic acid, amino acids, or trace elements.
• Storage and filling complete the line.

LANE supplies the fermentation tank as a single machine or as part of a complete line with separation, filtration, sterilization, mixing, storage, filling, and CIP systems.

Application Scope

• Livestock and poultry manure liquid.
• Biogas slurry and manure wastewater.
• Compost extract and plant-based organic liquids.
• Fish waste and fish hydrolysate.
• Seaweed extract and molasses-based formulas.
• Humic acid, fulvic acid, and amino acid liquid fertilizer production.
• Microbial biofertilizer and biostimulant production.
• Organic liquid fertilizer production for fertigation and foliar application.

Technical Specifications

Quality, Standards, and Certification

LANE fabricates liquid fertilizer fermentation tanks under an ISO 9001 quality management system and can supply CE-certified equipment with material certificates, welding records, and hydrostatic test reports.

For sanitary or pressure-rated projects, design and fabrication can follow customer-specified standards including ASME BPE, PED, ASME Section VIII, or GB/T 150. Internal surface finish, welding quality, and cleanability are controlled to support safe organic fertilizer production.

For organic fertilizer products, the final product must meet the destination market’s organic and fertilizer regulations, including contaminant limits, microbial safety, and labeling. LANE’s tank and line design support clean changeover, batch traceability, and quality control, and we recommend independent certification of the final product by the relevant authority.

Why Choose LANE Machinery

Henan Lane Heavy Industry Machinery Technology Co., Ltd. is a fertilizer equipment manufacturer with more than 20 years of engineering experience. LANE has delivered equipment and production lines to clients in more than 50 countries and supplied machines for a 100,000 tons per year national fertilizer project in Africa.

LANE provides one-stop service from process design and equipment selection to overseas installation, commissioning, operator training, remote video guidance, and after-sales support. For liquid organic fertilizer projects, our engineers review raw materials, microbial process requirements, capacity, and automation level, then recommend the correct tank size, material grade, agitation, heating, and control design.

Frequently Asked Questions

How long does liquid fertilizer fermentation take?

Typical mesophilic fermentation takes 3 to 15 days, depending on raw material, temperature, microbial inoculum, and process conditions. LANE designs the tank and process for your raw material to achieve a stable and repeatable fermentation cycle.

What is the difference between aerobic and anaerobic fermentation?

Aerobic fermentation uses oxygen supplied by an aeration system and is generally faster for many organic liquids. Anaerobic fermentation uses a sealed tank and gas outlet. LANE supplies both configurations and confirms the best process for your raw material and product target.

What temperature is needed for fermentation?

Most liquid organic fertilizer fermentation processes work best at 30C to 40C, when microbial activity is highest. The tank is insulated and heated to maintain this range even when ambient temperature changes.

Which stainless steel grade should I use?

SS304 is suitable for many organic liquid fertilizer processes. SS316L is recommended for acidic formulas, high-chloride raw materials, and products that require stronger corrosion resistance. LANE confirms the correct grade before fabrication.

Can I add NPK, humic acid, or trace elements during fermentation?

Yes. The tank has dosing ports for nutrients, microbial inoculants, and additives. Many producers add NPK, humic acid, amino acids, or trace elements during or after fermentation to create a balanced liquid fertilizer formula.

How do you control foaming?

LANE offers mechanical defoaming systems and process control to manage foam generated by organic raw materials. The tank is designed with freeboard, a gas outlet, and agitation control to reduce foam overflow.

Do you provide installation and operator training?

Yes. LANE provides overseas installation, commissioning, operator training, and remote video guidance. The five-year warranty covers equipment supplied under the project contract.

Get a Quote for Your Liquid Fertilizer Fermentation Tank

Send LANE your raw materials, microbial process, batch capacity, and automation requirements. Our engineering team will provide a fermentation tank configuration, technical data sheet, line integration recommendation, and quotation.