The aquaculture industry has experienced rapid development in recent years, with large-scale and intensive farms continuously expanding. As a result, the discharge of livestock waste and sewage has significantly increased, leading to severe pollution problems in some farming areas. Manure is piled up everywhere, and untreated wastewater flows into nearby water bodies, causing serious environmental degradation. During summer, the stench from these farms becomes unbearable, and mosquitoes swarm around, making the situation even worse. Many people believe that the issue of animal farming pollution has reached a critical point, and it is difficult to find a solution. However, how to regulate breeding scale, adjust the layout of aquaculture, and control pollution at the same time has become a major concern for local authorities.
In response to this challenge, our province has taken the lead in proposing plans for ecological province construction. Provincial and municipal leaders have visited sites to conduct field research, seeking effective solutions. Through the joint efforts of Zhejiang Blue Sky Ecological Agriculture Development Co., Ltd. and Zhejiang University’s School of Environmental Resources, an innovative "ecological, resourceful, and harmless treatment" model for pig farm waste has been developed and applied in practical production. This model integrates pig farming with alfalfa, grass, rice, pears, tea, and sheep, forming a new type of agricultural circular economy. By implementing clean production technologies, waste is minimized, resources are conserved, and comprehensive utilization is achieved.
The pig farm area covers 110 mu, housing 5,000 slaughter pigs and 15,000 commercial pigs. Under the guidance of Zhejiang University, the site uses a "cleaning and diversion" system, separating rainwater and sewage, and implements dry and wet manure separation. A top-bottom fermentation tank is used to store and process dry manure, preventing secondary pollution. Pig manure is mixed with straw and fermented to produce organic fertilizer, while the residue is used as base fertilizer for vegetable plots and pastures. The liquid waste undergoes solid-liquid separation, and the resulting slurry is used for irrigation of pastures and tea gardens.
A worm farming area was established in 2002, where 12,000 square meters of plastic greenhouses were built. This project transformed the traditional method of directly disposing of pig manure into farmland or fish ponds. Instead, it added value by using fresh pig manure and crop straw to produce earthworms and organic fertilizer. The annual economic benefits from this initiative amount to 605,000 yuan, demonstrating the potential of sustainable waste management.
In addition, the company has adopted eco-fish farming techniques, integrating alfalfa and other crops into the system. By applying advanced technologies such as "fling-fish-screw layering," micro-ecological regulation, and water level control, they have improved efficiency, reduced feed usage, and eliminated the need for antibiotics. These products have received certifications for being "non-polluting," "green," and "organic."
The agricultural product cultivation area spans 1,200 acres, including pear orchards, rice fields, and vegetable plots. Anaerobic biogas slurry and organic fertilizers are used to enrich the soil, promoting sustainable crop growth. Ongoing research and innovation in pig manure composting and biogas slurry utilization further enhance the circular economy model.
By following the principles of reduction, recycling, and reuse, the company has optimized the agricultural industrial structure, creating an efficient and sustainable system. This approach not only achieves "zero emissions" of waste but also ensures the conservation and efficient use of agricultural resources. The ultimate goal is to build a self-sustaining, economically viable, and ecologically friendly agricultural complex.
Innovation has opened new pathways. The Blue Sky Agricultural Model demonstrates that creativity and technological advancement are key to solving environmental challenges. Only through continuous innovation can we build a brighter and more sustainable future.
Correspondent: Yu Meizhong
Wenzhou Gaoya Light Industry Machinery Co.,ltd. , https://www.hongyafitting.com