The aquaculture industry has experienced rapid development, leading to the continuous expansion of large-scale and intensive farms. As a result, the discharge of livestock excrement and sewage has significantly increased, making aquaculture pollution a growing concern. In many farms, waste is piled up in open areas, and untreated sewage flows into nearby water sources, severely polluting the surrounding environment. During summer, the odor from these farms becomes unbearable, and mosquitoes are everywhere. Many people believe that the pollution caused by animal farming has reached an irreversible stage. How to manage breeding scale, adjust aquaculture layout, and control pollution simultaneously has become a major challenge for authorities at all levels. The ability to effectively address aquaculture pollution is now key to ensuring the sustainable development of the livestock industry.
So, how can we handle the waste from the livestock and poultry industry? What is the solution for sustainable breeding?
In recent years, with the rapid growth of animal husbandry, our province has taken the lead in proposing plans for the construction of an ecological province. Provincial and municipal leaders have conducted on-site research to find practical solutions.
With the joint efforts of Zhejiang Blue Sky Ecological Agriculture Development Co., Ltd. and Zhejiang University's School of Environmental Resources, a new technology for the "ecological treatment, resource utilization, and harmless disposal" of pig farm waste has been successfully developed and implemented. This innovative approach combines pigs, alfalfa, grass, rice, pears, tea, and sheep into a circular agricultural model. By adopting clean production methods, the company achieves resource conservation and comprehensive utilization. Waste reduction and resource recovery help adjust and expand the industrial structure, forming a combined agricultural and industrial chain. Several interrelated functional blocks have been established, creating a material and energy-efficient circular economy system. The use of ecological restoration technology not only recovers active ingredients from waste but also promotes pollution-free production in surrounding farmlands while reducing waste disposal costs, resulting in significant social, economic, and environmental benefits.
The pig breeding area covers 110 mu, housing 5,000 slaughter pigs and 15,000 commercial pigs. Under the guidance of Zhejiang University’s School of Environment and Resources, the site implements a "cleaning and diversion flow, rain and sewage separation, and dry-wet separation" system. It is equipped with a dry manure storage fermentation tank designed to prevent secondary pollution.
The farm uses clean production technology to separate wet and dry pig manure and sewage. Pig manure is mixed with straw and fermented in a manure pool, then used to breed flies and earthworms for feed. The residual solid sludge serves as base fertilizer for vegetable plots and pastures.
Pig farm sewage first enters a catchment well, then is pumped into a hydraulic screen for solid-liquid separation. The remaining solids are mixed back into the manure for comprehensive utilization. The liquid portion flows into a hydrolysis and acidification tank, followed by an anaerobic pond. The effluent from the anaerobic pond is used for irrigation of pastures or tea gardens, turning the forage into high-quality green feed for the original farm.
The earthworm breeding area was established in 2002 with an investment of 600,000 yuan, building 12,000 square meters of plastic greenhouses. This innovation changed the previous method of directly disposing of pig manure into fields or fish ponds, adding value to the waste. Annually, it processes 2,000 tons of fresh pig manure, 220 tons of crop straw, and produces 39 tons of live earthworms and 975 tons of organic fertilizer, generating annual economic benefits of 605,000 yuan. Earthworms are used as turtle feed, while the organic fertilizer is sold as premium organic fertilizer.
Today, the company uses a technology that turns manure into valuable resources, solving the problem of difficult pig manure handling. It allows flexible aquaculture planning based on actual conditions, with low investment and high returns.
The eco-fish farming area is part of Yuhang District's agricultural pillar industry. The company expanded its operations by integrating alfalfa and eco-cultivation. Through independent innovation, it adopted layered eco-technology, micro-ecological preparations, water level control, and new-age breeding techniques, achieving higher production efficiency, lower feed consumption, and no use of antibiotics. These products have passed non-pollution, green, and organic certifications.
Feeding turtles with earthworms not only reduces feed costs but also improves the turtles’ immunity and growth rate, offering a more profitable way of raising them.
The agricultural product cultivation area spans 1,200 acres, including pear orchards, rice fields, and vegetable plots, with seasonal rotation. Part of the biogas slurry and organic fertilizers are utilized through field ditches and manual transport.
To deepen the recycling of waste urine and build a highly efficient circular economy, the company collaborates with research institutions like Zhejiang University to explore pig manure composting, biogas slurry application, and fly maggot farming.
Based on the principles of "reduce, reuse, recycle," the company integrates and optimizes the existing agricultural structure, establishing an efficient material and energy recycling system. It aims to achieve zero emissions from waste, conserve agricultural resources, and eventually build a well-planned, ecologically self-sustaining, and economically viable facility that balances ecological, economic, and social benefits.
Innovation has opened new paths. The example of Blue Sky Agriculture not only shows a new and creative approach but also highlights that innovation is the soul of corporate development. Only through courage and continuous innovation can we create a bright future.
Correspondent: Yu Meizhong
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