Environmental Protection Requirements for NPK Blending Fertilizer Production Lines
The environmental protection requirements for NPK Blending fertilizer production lines revolve around four core areas: exhaust gas, wastewater, solid waste, and noise. These requirements also include ensuring compliance with approval processes and implementing long-term management. Specific requirements are as follows:
Prior to operation, environmental impact assessments, safety assessments, and pollution discharge permits must be obtained. The “three simultaneous” system (simultaneous design, construction, and operation of environmental protection facilities) must be strictly implemented, and environmental protection acceptance must be completed before production begins. Emission standards must comply with national standards, and stricter local standards should be prioritized. Exhaust gas treatment is of paramount importance. Crushing, granulation, drying, and screening processes must be completely enclosed, and equipped with bag filters or cartridge dust collectors to ensure particulate matter emissions are ≤10mg/m³. Granulation and drying exhaust gases must be treated by acid scrubbing towers and biofilters to control ammonia emissions to ≤20mg/m³ and hydrogen sulfide to ≤5mg/m³. Boiler flue gas must utilize low-NOx combustion + SCR/SNCR technology, with nitrogen oxide emissions ≤50mg/m³. Raw material warehouses and batching warehouses must be completely enclosed and operated under negative pressure to strictly control fugitive emissions. Plant boundary particulate matter should be ≤1.0mg/m³, and odor concentration ≤20 (dimensionless).
Wastewater must be separated into clean water and sewage. Production wastewater, after coagulation sedimentation and biochemical treatment, must meet the following standards: pH 6-9, SS ≤70mg/L, COD ≤100mg/L, and ammonia nitrogen ≤15mg/L. Wastewater reuse should be prioritized to reduce external discharge, and sewage tanks must be covered and sealed to collect exhaust gases. Regarding solid waste disposal, dust, screening return materials, and unqualified products can be reused in the production line; waste engine oil, heavy metal-containing sludge, and other hazardous wastes must be transferred and disposed of in accordance with regulations, and clear records must be maintained.
Noise control requires the use of low-noise NPK blending machine. Vibration damping devices and sound insulation covers should be installed on fans, crushers, and other equipment to ensure that plant boundary noise is ≤65dB(A) during the day and ≤55dB(A) at night. In addition, raw material and finished product storage areas must be protected against leakage and rain to prevent soil and groundwater contamination; exhaust stacks must be equipped with online monitoring equipment for particulate matter, ammonia, and nitrogen oxides, with data transmitted to the ecological environment department; environmental protection facilities must be linked to the production line for simultaneous start-up and shutdown, regularly maintained, and have operation logs established; and emergency plans must be developed to address pollution risks.
