Sewage treatment to promote sound duckweed technology to overcome the new fortress

Recently, automated sewage treatment and closed-loop recycling is no longer a problem. Shandong Province has successfully applied "Duckweed-based Poultry Sewage Treatment System and Resource Utilization Demonstration Project" to Bolan Town dairy farm in Jimo City. The project's application can also solve domestic sewage treatment and bring new benefits to water treatment.

Sewage treatment to promote sound duckweed technology to overcome the new fortress

July 23, 2017, Chinese Academy of Sciences, Qingdao Institute of Bioenergy and Process information released by the Institute and the Qingdao Institute of Animal Husbandry and Veterinary "duckweed-based livestock breeding wastewater treatment system and resource utilization demonstration project" has been successfully applied In Shandong Province Jimo paragraph Bo Lan town dairy farm, is the first application of duckweed biotechnology for livestock wastewater treatment and the realization of high value of the project. It is reported that the project automation devices and closed-loop recycling system reached the international advanced technology level.

The Dairy Farm located in Dapu Lan Town is part of the Comprehensive Experimental and Demonstration Center of the City Animal Husbandry and Veterinary Research Institute. The 1,500-square-meter Duckweed Efficient Wastewater Treatment System in the dairy farm is fully automated. Only need a worker to start the button, the dairy cow dung collected in the farm for wet and dry separation, dry manure into organic fertilizer, the sewage will be collected into the glass photovoltaic greenhouse, a multi-storeyed duckweed in the greenhouse shed "nourishment ". After the duckweed removes the inorganic nitrogen and phosphorus in the sewage, the clean "middle water" is automatically discharged into the temporary storage tank, which can not only be used as landscape river water in the park, but also be used for flushing the bullpen. Most importantly, from time to time, rapidly growing duckweed will be automatically harvested, processed into starch, high-quality feed and other substances, to achieve comprehensive utilization of resources.

According to Chingnen Institute for Advanced Plant Resources, Chinese Academy of Sciences, "Hundred Talents" expert Zhou Gongke introduction, the use of duckweed for small town sewage treatment is one of the most commonly used means in Europe and the United States, but China is subject to land, population and other resource constraints in recent years The research is just beginning. "Although we started late, but the technology is not backward." Zhou Gong Ke told reporters that automation and recycling applications in the international no relevant reports.

It is understood that the total output value of animal husbandry in Shandong Province ranks first in the country, producing about 270 million tons of manure each year, not only caused some of the water eutrophication, pollution of the surrounding air farm, but also easy to spread the disease. Jimo is a major livestock husbandry in Shandong Province, which became the first choice of Zhoukeng team test point. They started designing and building factories in 2012 and put them into trial operation in 2016. Test data show that the sewage treatment of 4,000 tons per mu shed, with an annual output of duckweed 5 tons of raw materials, extract Duckweed starch 2 tons per year. "We selected duckweed germplasm, deliberately selected high starch content or high protein content of the species, duckweed collected in addition to animal feed, but also can be used to make paints, rubber, medical adhesives, animal gelatin instead of doing medical Capsule, comprehensive utilization of high value. "Zhou Gong Ke said.

In another development, the successful trial duckweed pollution control not only for livestock husbandry sewage treatment can also be used for domestic sewage treatment. At present, Green Energy is working with Qingdao Water Group and other departments to promote the further application of the project.

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