Shenyang Solid Waste Comprehensive Utilization Green Environmental Protection Industrial Park Construction Waste Treatment Project

Shenyang Solid Waste Comprehensive Utilization Green Environmental Protection Industrial Park Construction Waste Treatment Project

I. Project Background

With rapid urbanization, Shenyang generates over 8 million tons of construction waste annually. The original disposal method (simple landfilling) suffered from low resource utilization (<20%), land occupation, and environmental risks. To promote "Zero-Waste City" construction, the government initiated an upgrade project to establish an efficient, intelligent construction waste recycling system.

II. Technical Parameters and Configuration

The core system adopts a "pre-sorting + two-stage crushing + multi-stage screening + air/magnetic/optical separation" process.

Parameter Value

Plant Area 63,842 m² (180 mu)

Total Investment 160 million RMB

Annual Capacity 1.0 million tons (700kt construction + 300kt decoration waste)

Product Output 0-5mm: 400kt; 5-10mm: 300kt; 10-20mm: 150kt

Additional Lines 50kt/year recycled cement-stabilized macadam; 20kt/year fluid solidified soil

Key Equipment:

Crushers: Jaw crusher (coarse, ≤800mm → ≤200mm); Impact crusher (fine, ≤200mm → ≤40mm)

Screens: Three-layer vibrating screen (5/10/20mm meshes)

Sorting: Magnetic separator (ferrous metals); Air separator (light materials); Optical sorter (inert materials)

Control System: DCS with industrial IoT, remote monitoring, fault self-diagnosis

Dust Control: Pulse bag filter (emission ≤10mg/m³) + spray system

Mobile Units: 3 mobile crushing/screening stations (200 t/h each) for on-site treatment

III. Implementation Plan

3.1 Foundation and Mechanical Installation

Steel structure main workshop with heavy-duty foundations for crushers/screens

Laser alignment for crusher spindle: horizontal error ≤0.1mm/m

Belt conveyor deviation control ≤5% of belt width

3.2 Electrical and Control System Commissioning

Industrial Ethernet ring network with shielded cables

DCS programming: setting crusher gap, screen amplitude, air separator speed

Safety logic test response time ≤0.5s (overload, blockage, emergency stop)

Integration with ERP for automatic data reporting

3.3 Trial Operation and Optimization

No-load test: 4 hours continuous; bearing temp rise ≤40°C; vibration ≤4.5mm/s

Load test: Gradual loading 25% → 50% → 75% → 100% of design capacity

Monitor: crusher current, particle size distribution, screening efficiency (≥90%), magnetic separation efficiency (≥98%), light material removal (≥95%)

Final product impurity rate ≤0.5%, meeting GB/T 25176 standard

IV. Results

4.1 Production Efficiency

Resource utilization rate increased from <20% to 92% (near-zero landfilling)

Annual output: 850kt recycled aggregates (0-20mm grades)

Additional products: 500kt cement-stabilized macadam + 200kt fluid solidified soil

Land saved: ~300 mu/year

4.2 Safety and Environmental Performance

Fugitive dust concentration ≤0.5mg/m³ (well below national standard)

CO₂ emission reduction: ~30,000 tons/year (vs. natural aggregate mining)

Natural resource saving: 850kt/year of sand/gravel equivalent

Zero environmental violations or major equipment accidents since commissioning

4.3 Economic Benefits

Metric Value

Unit energy consumption Reduced by 18% (6.5 → 5.3 kWh/ton)

Annual revenue ~120 million RMB

Annual net profit ~40 million RMB

Investment payback period ~4 years

Revenue sources Aggregate sales, disposal service fees, government subsidies

Conclusion: This project demonstrates that an intelligent crushing-screening system with robust dust control, automated sorting, and comprehensive safety features can effectively solve urban construction waste challenges, achieving high resource utilization and providing a replicable model for similar cities.