The organic fertilizer production process is complex, encompassing multiple stages from raw material processing, high-temperature fermentation, fine granulation, to finished product storage. Influenced by factors such as raw material ratios, ambient temperature, equipment operation, and process control, the organic fertilizer production process is highly susceptible to various faults, which not only reduce production efficiency but also lead to substandard product quality and nutrient loss. This article summarizes typical faults that frequently occur in production to help improve production quality and efficiency.
The fermentation and maturation stage is the core process most prone to faults. Common problems include slow heating of the compost pile and insufficient temperature, preventing high-temperature harmless maturation. This is often caused by an imbalance in the carbon-nitrogen ratio of the raw materials, or excessively high or low moisture content. A high carbon-nitrogen ratio and excessive moisture can easily lead to oxygen deficiency in the compost pile, reducing microbial activity; insufficient moisture and overly dry raw materials hinder microbial reproduction and stagnate fermentation. Simultaneously, insufficient turning frequency and poor ventilation can lead to anaerobic fermentation in the compost pile, resulting in sourness, foul odor, and the breeding of insects, ultimately causing incomplete maturation of the material and making the finished product prone to causing seedling burn after application.
Frequent malfunctions in the granulation process directly impact the appearance and quality of the finished product. Common problems include low granulation rate and loose, brittle granules, primarily caused by insufficient material grinding fineness, improper binder ratios, and uncontrolled material moisture content. Excessive drying temperature and improper cooling processes can lead to granule cracking and nutrient loss through volatilization. Furthermore, clogged or malfunctioning screening equipment results in high impurity levels, uneven granule size, and inconsistent product quality.
Quality issues also arise during finished product storage and subsequent shelf-life preservation. Inadequate moisture control during stacking and poor ventilation in storage can cause organic fertilizer to absorb moisture, leading to clumping and hardening, severely affecting its effectiveness. Functional bio-organic fertilizers are also prone to microbial agent inactivation, often due to high-temperature processing and hot, humid storage environments, which deactivate beneficial microorganisms and impair their soil-improving, growth-promoting, and antibacterial functions.
In summary, most organic fertilizer production failures stem from imprecise process control and inadequate parameter management. Precise control of fermentation parameters, standardized operation of organic fertilizer equipment, and proper management of finished product storage can effectively avoid various production problems and ensure the stability of organic fertilizer quality.
