Domestic Transformation and Technological Innovation of China’s Waste Incineration Industry

Introduction

China's waste incineration industry has entered a critical stage of quality upgrading after decades of scale expansion. Driven by waste sorting promotion, stricter environmental standards, solid waste collaborative disposal, circular utilization and intelligent technological iteration, the sector is phasing out extensive development models. It is also restructuring its profit logic amid national subsidy phase-outs, realizing a comprehensive transformation from simple waste disposal to efficient, green and low-carbon resource utilization.

1. Waste Sorting and Incineration: A Win-Win Symbiotic Relationship

The view that waste sorting causes incineration plants to operate under capacity is a one-sided misunderstanding. Industrial operational data shows that undercapacity is a typical regional and structural problem rather than a nationwide crisis. In eastern China, Zhejiang and Shandong’s incineration facilities maintain high load rates of 90% and 84% respectively, far exceeding the 70% minimum reasonable load rate stipulated by national authorities. Only a small number of provinces in southern and northern China face low capacity utilization.

In fact, waste sorting is a core booster for the high-quality development of the incineration industry. The centralized separation of kitchen waste greatly improves the calorific value of residual domestic waste, laying a foundation for higher power generation efficiency. Although high-calorific waste brings new challenges such as furnace coking and equipment overheating to traditional incinerators, it has spurred nationwide targeted technical renovations. Upgrades to furnace grate materials, cooling systems and air distribution structures enable modern incineration equipment to adapt to fluctuating waste calorific values and maintain stable combustion.

Environmentally, waste sorting significantly reduces incineration pollution risks. Practical data from Shanghai proves that standardized waste sorting cuts incineration plant pollutant emissions by 47% to 84%. Unsorted wet waste not only reduces combustion efficiency by 30% but also greatly increases dioxin generation risks. In contrast, sorted dry waste burns more sufficiently and stably, making flue gas pollution control more accurate and efficient. Waste sorting and incineration are therefore mutually supportive: sorting optimizes waste quality, while refined incineration realizes maximum resource value of sorted waste.

2. Flue Gas Ultra-low Emission: Core Technical Renovation for Green Upgrading

Continuous tightening of flue gas emission standards has become the most direct driving force for the technological iteration of the waste incineration industry. Based on the national standard GB18485-2014, many Chinese cities have formulated far stricter local ultra-low emission standards. Shenzhen’s standard is recognized as one of the strictest globally, with particulate matter, sulfur dioxide and nitrogen oxide indicators drastically reduced. Shanghai’s new local standard implemented in 2026 adds ammonia emission limits and refined daily and hourly average indicators, while Hunan’s updated standard expands pollution control scope and indicators.

To meet ultra-low emission requirements, the industry has formed a mature and systematic technical renovation system. The combined SNCR+SCR denitrification technology realizes deep removal of nitrogen oxides, keeping emissions at an ultra-low level in benchmark projects. The composite acid removal process of semi-dry, dry and wet treatment effectively controls sulfur dioxide and hydrogen chloride. Upgraded high-efficiency coated filter bags achieve advanced particulate matter purification. In addition, precise ammonia injection control technology has become a key renovation focus to avoid ammonia escape under new emission rules.

Nevertheless, large-scale environmental renovation brings huge capital pressure on enterprises. A number of renovation projects completed in 2025 involved billions of yuan in investment. Coupled with difficulties in accounts receivable recovery, environmental protection enterprises are facing the dual challenge of ensuring compliance and maintaining operational profitability, forcing the industry to explore more efficient and cost-effective technical paths.

3. Diversified Solid Waste Co-combustion: Breaking Domestic Overcapacity Dilemma

Structural overcapacity in some regional incineration facilities has become a prominent industry pain point. The co-combustion and collaborative disposal of diversified solid wastes have become an effective way to improve capacity utilization and optimize operational benefits. A variety of industrial solid wastes and organic wastes, including waste textiles, plastics, wood scraps, traditional Chinese medicine residues, garden waste and municipal sludge, feature high calorific value and can serve as high-quality alternative fuels for incineration plants.

Relevant national and local policy systems have been fully improved to support collaborative disposal. The national solid waste treatment action plan and industry national standards clearly allow qualified municipal sludge and general industrial solid waste to be co-incinerated on the premise of stable operation and standard emissions. Local governments such as Wuhan have issued detailed disposal catalogs to standardize the types and sources of co-combustible solid wastes.

In terms of operational management, various regions adopt differentiated co-combustion ratio control policies according to local conditions, forming a graded and refined supervision system. At the same time, the industry has drawn clear red lines: medical waste and hazardous waste are strictly prohibited from being mixed into domestic waste incineration systems, with independent disposal standards and management mechanisms implemented. Given the current inconsistent local supervision rules, unified national technical specifications and full-chain online monitoring systems are urgently needed to standardize the collaborative disposal industry.

4. Fly Ash Resource Utilization: Building a Closed-Loop Circular System

Incineration fly ash, classified as hazardous waste due to heavy metal and dioxin content, was mainly disposed of by landfill for a long time, resulting in land occupation and potential long-term environmental risks. Promoting fly ash harmless treatment and resource utilization has become an essential part of building a circular waste treatment system.

National and local policies have clearly defined the development direction of fly ash recycling, requiring new incineration projects to synchronize supporting fly ash treatment facilities and gradually reduce landfill volume. Multiple regions including Shanghai and Guangdong have launched special policies to encourage diversified high-value utilization of fly ash.

At present, three technical paths are widely applied and explored in the industry. Cement kiln collaborative disposal is the most mature industrialized technology, which realizes resource reuse after fly ash washing and desalination. In-plant fly ash re-incineration technology achieves waste reduction and harmlessness through physical and chemical optimization. High-temperature melting technology can completely solidify heavy metals to form safe glassy materials, though high energy consumption restricts its large-scale promotion. The core bottleneck restricting industrial development is the high-cost treatment of high-salinity wastewater generated by fly ash washing, which is the key direction of future technical breakthroughs.

5. AI Intelligent Empowerment and Post-subsidy Business Model Restructuring

Digital and intelligent transformation is reshaping the operational mode of traditional waste incineration plants. In the past, incineration operation relied entirely on workers’ empirical judgment. Today, AI visual recognition, big data analysis and large model decision-making systems realize real-time monitoring of furnace temperature and flame status, automatic optimization of air distribution and feeding parameters, and stable maintenance of optimal combustion conditions. Intelligent transformation effectively improves power generation efficiency and operational stability, with benchmark projects achieving a 3%-5% increase in power generation and a significant reduction in operational fluctuation.

Intelligent technology is also expanding to full-scenario applications such as equipment predictive maintenance, emission intelligent early warning and group digital management, turning traditional manual-dependent plants into data-driven smart factories.

Meanwhile, the industry is facing the comprehensive withdrawal of national subsidies, ending the decade-long profit model relying on policy subsidies. Facing operational pressure, enterprises are actively exploring diversified profit channels. Thermal-power cogeneration that supplies industrial and municipal heating has become the second growth curve of the industry. In addition, CCER carbon trading, furnace slag metal recycling and mobile heat supply services have built a multi-dimensional profit system. Outstanding practical cases have proved that refined operation and technological innovation can fully hedge the pressure of subsidy withdrawal and insufficient waste volume, enabling incineration plants to transform from single waste disposal facilities to regional comprehensive energy service hubs.