Dead livestock will benefit the environment

In March of this year, a large number of dead pigs were floating in Songjiang section of Huangpu River in Shanghai, which caused a great stir How to deal with dead animal corpses is also widely concerned Yesterday, a special vehicle for dead and injured animals drove into Huzhou harmless treatment center for dead and injured animals, and four boxes of dead animals were sent to the pyrolysis and carbonization furnace for treatment After 4 hours of pyrolysis and carbonization, they become biochar This technology is developed by Zhejiang Wuneng Environmental Protection Technology Development Co., Ltd "After being ground into powder, biochar can be used as a good talent for soil improvement, fuel, etc., so that resources can be reused." The technology is the first in the country and is applying for a national patent, said the administrator of Huzhou City's harmless treatment center for dead and injured animals A carbonization furnace can handle 800 kg of dead animals innocuously every time yesterday, reporters saw in the innocuous treatment workshop, dozens of dead animals were placed in four baskets respectively, and two workers lifted them onto the conveying track The operator presses the button, the dead animal enters the pyrolysis and carbonization furnace, and the treatment begins During the whole process, almost no peculiar smell can be heard Next to the treatment equipment, a sack of straw solidified substance is placed According to Che Lei, chief engineer of the R & D team of Wuneng company, this is the fuel for pyrolysis and carbonization, which is also made of biomass waste, which can be said to be "treating waste with waste" More than 3 hours later, the carbonization is over Chelei told reporters that this pyrolysis and carbonization furnace can handle two furnaces a day and about 800 kg of dead animals at a time, with treatment time ranging from 3 to 5 hours "The pyrolysis and carbonization of animal corpses is to use high temperature of 500-600 ℃ under the condition of oxygen-free and atmospheric pressure to gradually dry and pyrolyze them, and finally become carbonized substances The flue gas and animal fat produced by pyrolysis are sent back to the combustion chamber through pipes to continue combustion support This technology is the first in China " Chelei said that the high temperature treatment above 600 ℃ has a thorough sterilization effect, and the pyrolysis treatment in an oxygen-free environment reduces the generation of dioxins Through monitoring, after environmental protection treatment of flue gas, the pollutant is much lower than the national emission standard, and there is no odor "Before, the dead animals in the treatment center were incinerated, but the whole animal could not be put into the incinerator when incinerating, and only after crushing and cutting the pieces could it be burned up In the process of crushing, some sundries cannot be burned and may cause secondary pollution " Governance said The person in charge of Huzhou harmless treatment center for dead and injured animals has calculated an account With incineration method, the treatment cost per ton of dead animals is about yuan, and there is no use value after incineration In the cooking method, the dead animals are boiled at high temperature and then separated from oil and water Although the separated oil can be made into biodiesel, it needs more fuel and produces more waste water pollution The cost of pyrolytic carbonization is only RMB / ton, and 160 kg of biochar can be produced per ton of dead animals, with a market price of RMB / ton Last year, there were 4800 tons of dead animals in Huzhou In the past, the dead animals were mainly treated by the farmers themselves Generally, they were treated by digging a pit for landfilling and building a corpse cellar "The development of animal husbandry and the increase of breeding volume require a lot of land for treatment, which takes a long time and is easy to cause pollution Some farmers may also discard them at will " In recent years, there have been new treatment methods such as incineration, cooking and biological methods However, these methods have shortcomings Last year, when the government saw that tyres could be carbonized, it came to the idea of whether dead animals could also be pyrolyzed and carbonized to turn waste into treasure Experts in solid waste treatment set up a research group to tackle key problems, and finally the technology of pyrolysis and carbonization of dead animals came out "Now we have a unified collection and centralized treatment of dead animals." Zhu said that they are going to build 23 collection points, of which 7 have been built, 5 have been put into use, and 16 are planned to be built to achieve full coverage of dead and dead animals In addition to not using farmers to pay, Huzhou also links the treatment of dead animals with agricultural policy insurance claims "The human resources insurance company shall make claims based on the treatment sheet of the harmless treatment center for dead animals If the farmers discard the dead animals at will, without the treatment sheet of the harmless treatment center, the human resources insurance company will not make claims." Zhu said Next, Pinghu City in Jiaxing has also determined to use this new technology for harmless treatment of animals In other areas of our province, including Hangzhou, the incineration method and landfill method are mostly used at present At present, the provincial environmental protection department has recommended Huzhou City to the Ministry of environmental protection as a pilot city for pyrolysis and carbonization of dead animals.