Odor management in livestock farms has long been a focus of public concern. To address this challenge, the China Animal Husbandry Association held a conference on "Odor Reduction and Control Technologies for Livestock Farming" in Hangzhou, Zhejiang.
The conference focused on three key topics: source reduction, process control and final deodorization. The goal was to effectively control and reduce the foul gases produced during livestock farming through technological innovation and management optimization. The conference invited professors from top universities such as Zhejiang University, China Agricultural University, and South China Agricultural University to share the latest research and technological advances.
The conference began with a keynote speech by Director Wang of the Ministry of Ecology and Environment. He emphasized that the odor problem in livestock farms has seriously affected the lives of local residents. According to data, odor complaints from livestock farms account for more than 20% of all environmental complaints and nearly 50% of air quality complaints. In response, governments are imposing increasingly stringent odor control standards on livestock farms.
Director Wang pointed out that ammonia (NH₃) is the main component of odors from livestock farms, and detailed the management and control of ammonia emissions in the livestock sector. China has a large amount of ammonia emissions and the government has implemented a series of reduction measures, with pilot projects underway in regions such as Beijing, Tianjin and Hebei. While initial successes have been achieved, further improvements are still needed.
In fact, as early as the National Environmental Protection Conference in July 2023, President Xi Jinping emphasized the need to address the foul odors that affect the lives of local residents. Ammonia, which is the main source of odors in animal husbandry, is a key substance in controlling these problems. Therefore, accelerating the reduction of ammonia emissions has become an urgent task for the livestock industry.
Next, Professor Wang of Zhejiang University provided an in-depth analysis of comprehensive odor reduction technologies for large-scale operations. She emphasized that an effective odor reduction plan must cover the entire process, from source control and process management to end-stage treatment. In particular, she highlighted the critical role of final stage deodorization. This step typically involves the use of physical, chemical or biological methods to purify the collected odorous gases.
Common physical methods include dilution, condensation and adsorption. However, these methods are often insufficient to completely eliminate odors. Chemical treatments, such as acid-base absorption and scrubbing, are more effective at neutralizing or breaking down harmful components, especially in high concentration industrial emissions. Biological deodorization technology is a current research hotspot. The use of specific microorganisms as deodorizers in biofiltration systems has proven to be highly efficient and has great potential.
Professor Wang also highlighted the importance of fermentation tank in processing organic waste such as livestock manure. By using advanced fermentation technologies, the degradation rate of organic materials can be significantly improved, thus reducing the unpleasant odors that result from these materials.
As a leading innovator in the field of end-stage deodorization, Bolong Group was also invited to the conference. Mr. Zhang Xueyi, the After-Sales Director of Bolong, shared the company's breakthrough innovations and significant achievements in gas deodorization, providing valuable insights to the attendees.
Bolong, with 31 years of experience in modern animal husbandry, has developed high-temperature aerobic fermentation tanks equipped with the newly designed 5.0 gas deodorization system. This innovative system has greatly improved the end-stage deodorization technology, providing green and sustainable solutions for livestock farming.
The 5.0 Gas Deodorization System developed by Bolong is an advanced, environmentally friendly solution designed to efficiently treat harmful gases such as ammonia (NH₃), hydrogen sulfide (H₂S), and methyl mercaptan (CH₃SH) produced by fermentation tanks in large-scale farms. The system cleverly integrates advanced physical, chemical and biological technologies to absorb and break down these foul gases.
The core of the system is its ability to take advantage of ammonia's solubility in water. Through a scrubbing process, ammonia reacts with water to form ammonium hydroxide (NH₄OH), significantly reducing the concentration of ammonia in the air. In addition, the system uses activated carbon as an adsorbent to capture and fix harmful substances such as hydrogen sulfide and methyl mercaptan, which enhances the deodorizing effect.
What sets Bolong's system apart is the integration of biological deodorization technology, which is the highlight of the system. By using carefully selected microorganisms, the system efficiently converts the sulfur elements in hydrogen sulfide and methyl mercaptan into odorless or low-odor compounds, effectively eliminating the source of the foul odor. This biological conversion process is highly efficient, environmentally friendly and free of secondary pollution.
To ensure that the microbial deodorizers operate under optimal conditions, the system is equipped with a cooling tower to regulate the temperature of the water in the storage tank, keeping it below 35°C - the ideal growth temperature for the microbes. The use of a recirculating water design not only conserves water resources, but also ensures the continuous and stable operation of the system.
This conference has opened up new perspectives for environmental protection and shown the way forward for odor management in livestock farms. Thanks to the meticulous organization of the China Animal Husbandry Association and the insightful presentations from various experts, we can look forward to a greener and more sustainable future for livestock farming. With innovative companies like Bolong leading the way, the livestock industry will embrace cleaner, more efficient and environmentally friendly practices.
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