Agricultural entrepreneurship story: raising black gadfly larvae to deal with kitchen waste

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Catering waste, also known as kitchen waste (commonly known as slop), is a general term for leftovers, table waste and kitchen scraps, the source of which is mainly restaurants, canteens, street food stalls and other places. It contains a variety of organic substances in the summer is very easy to corrode and produce pollution, especially by the catering waste fed pigs and refined slop oil once the market, will seriously jeopardize the health of the people. At present, a large number of food and beverage waste has become one of the main sources of urban pollution, how to scientific and harmless treatment, has become a troubled city management and construction of the problem.

In the family farm of Wang Zepu in Cao County, Shandong Province, an innovative experiment is drawing people's attention: the larvae of black gadfly are used to deal with kitchen waste, which is not only ecological and environmentally friendly, but also has an amazing output value.

"This is a kind of resource insect, called bright spotted flat horned gadfly, commonly known as black gadfly. Black gadfly is a kind of carrion-feeding insect in the family of Diptera gadfly, and its growth and development is divided into egg stage, larval stage, pupal stage and adult stage. The larvae feed on decayed organic matter and animal feces in nature; the adult gadfly is like a fly, but bigger than a fly, and its life span is not more than 10 days, feeding on nectar and dew, and laying an average of a thousand grains of eggs. Larvae like to eat rotten things, animal feces, slop are its food. The swill can become the feed of gadfly larvae after a little treatment. Moreover, black gadfly larvae are not sensitive to salt, seasonings, food toxins and other chemical additives, and especially prefer greasy food." Liu Jie, the head of the farm, talks about the black gadfly at length.

"There is a set of data that can show the large amount of food of black gadfly larvae and the 'efficiency' of swill treatment: larvae from the 3rd age enter a large number of feeding stage, in the case of sufficient food can be fed all day round the clock, the efficiency of feeding is very high. 1 cubic meter saturated 4th age larvae in the appropriate environment, in 24 hours can deal with about 800 kg (70% water content) kitchen food, and can be treated with the help of a large amount of food. water content) of kitchen waste. It is particularly effective in treating common organic wastes such as dead fish, rotten fruits, pig manure and leftover food." Liu Jie added.

Black gadfly larvae how to make slop into treasure? Liu Jie told the author that the liquid slop can not be fed directly to the larvae, the water needs to be filtered out first, and the remaining solid material can be fed. In addition, the nutritional value of black gadfly larvae is also very high, the dried black gadfly larvae contain 45% crude protein and 36% fat, as well as amino acids and fatty acids and other substances, which is better than ordinary soybean meal and bone meal, and it can be processed into dried insect powder to replace fish meal, which is a high-quality aquaculture feed. Black gadfly larvae can also be fed directly as feed to chickens, fish and other economic animals, because its larvae can survive in the water, it is a rare live bait for aquaculture.

According to Liu Jie, at present, there is a company in Tianjin has reached a cooperation intention with him to buy dried black gadfly larvae at 12,800 yuan per ton. After the preliminary test, 1 kg of kitchen waste can feed 500 grams of black gadfly larvae, and 1,500 grams of larvae can be baked out of 1,000 grams of dried insects.

Liu Jie in Caoxian County, Shandong Province can be called a legend, his early years of entrepreneurial experience is widely admired by local villagers. 2000, he founded the Chinese insect network, 2008, he learned from the Internet to South Korea's breeding of black gadfly to deal with the garbage is very successful, he tried to find ways to hire from the South Korean Academy of Sciences, a gadfly specializing in black gadfly breeding experts, Zhengzhou, Henan Province, to build the first black gadfly resource application of the country. The first black gadfly resource application institute was built in Zhengzhou, Henan Province. However, the black gadfly brought from South Korea does not spawn, tossed nearly two years, the Korean expert gave up the research to go back to his home country, more than 300,000 yuan of investment hit the water. Liu Jie, who is not willing to fail, started to explore the black gadfly breeding technology by himself. 2013, by a chance, he collected a small insect similar to black gadfly in a dairy farm, which was later confirmed by the experts that this gadfly is called brightly-spotted gadfly, which is widely distributed in our country. It turned out that the black gadfly is a close relative of the Chinese gadfly, but its habits are very different, so it is no wonder that the gadfly is not suited to the soil and water.

Liu Jie started to breed black gadfly in his own family farm, and experimented with black gadfly larvae to deal with kitchen garbage, chicken manure, pig manure, rabbit manure and so on, and obtained the first-hand informative and reliable information. Nowadays, Liu Jie started to expand the scale of black gadfly breeding while actively promoting the ecological harmless garbage treatment station project he designed and researched.

"Shandong Province has just introduced the "kitchen waste management approach", the province's kitchen waste generation, collection and transportation, disposal and supervision and management of clear provisions, and pointed out that the management of kitchen waste will be included in the catering business rating conditions. According to the 2012 statistics from the Sanitation Department of Heze Municipal Public Utilities Bureau, the daily amount of kitchen waste in the four districts within Heze City is 180 tons, and tens of thousands of tons of slop waste are generated every year. Now the state invests in the construction of a county-level kitchen waste treatment site, about 4.5 million yuan, if we prepare to build an equal amount of scale, specializing in the use of black gadfly larvae to deal with food and beverage waste, the investment is only 300,000 yuan, and the two benefits are almost the same, so it can be seen that the black gadfly treatment of garbage has great potential in the market. Coupled with the fact that black gadfly has the characteristics of fast growth, strong reproduction and regeneration ability, high food conversion rate, if it can be cultured on a large scale, the prospect is very broad." When saying these words, Liu Jie looks confident.

It is worth mentioning that China is the largest importer of feed additives fishmeal, in 2013, China's demand for fishmeal is about 2.6 million tons, the domestic production of fishmeal is far from meeting the demand, so it is necessary to import about 1.3 million tons per year from abroad. At present, Liu Jie has sent his experimental breeding of black gadfly insect oil, etc. to the authority designated by the Ministry of Agriculture for testing, if the gadfly products can be used to replace fishmeal after testing, it means that the black gadfly products can be provided to the domestic fishmeal market of 1.3 million tons per year, with an output value of 10 billion yuan.