How to deal with sludge has always been a headache for many paper mills. The traditional incineration and landfill treatment methods not only deal with high cost, but most importantly, cause pollution to the environment. In Panjin Liaohe mouth eco economic zone, small earthworms easily solve this problem, and drive a green recycling industry chain.

　　In November 19th, the reporter saw several small striped soil piles in the wintering earthworm sheds in Zhang Yuquan's home, each of which was about 1 meters wide and half a meter high. "This is the earthworm bed. In winter the bed is laid in the shed, and in the spring it moves out of the shed and is spread on the earth." "The main ingredient of the earthworm bed is paper sludge and cow dung, and earthworms eat this fast," said Zhang Yuquan, a Panjin Yulin earthworm breeding cooperative. A pink earthworm is clearly visible when the earth is opened. "These small earthworms are quite capable of turning sludge into organic fertilizer, which not only solves the problem of paper mills, but also brings millions of yuan to the cooperatives."

　　In 2009, the Yulin earthworm breeding cooperative was established, and built an earthworm breeding base with an area of 120 mu and 1000 beds, including earthworm breeding, airing and freezing storage.

　　There is a large paper mill in the ecological economic zone of the Liaohe estuary. The sludge produced by the paper mill is a good feed for the earthworms. The digestive tract of the earthworm is a natural organic waste disposal plant. Earthworms phagocyted sludge during the process of sludge treatment, and the sludge entered the earthworms through digestion and excreted earthworm feces. Yulin earthworm breeding cooperatives can digest more than 20 thousand cubic meters of paper mill sludge every year, which not only reduces the cost of farming, but also plays a role of green environmental protection.

　　The acidity and alkalinity of the vermis is suitable. It has the properties of water conservation and fertilizer preservation. It contains the trace elements needed by plants. It is a kind of efficient biological fertilizer. Panjin farmers in rice seedling planting or Pengcai, are willing to use vermicompost as fertilizer. The earthworm feces of the Yu Lin earthworm breeding cooperative are always in short supply. For a year, the Yu Lin earthworm breeding cooperative sold 62 thousand cubic meters of earthworm feces, making a profit of 1 million 200 thousand yuan.

　　According to Zhang Yuquan of Yu Lin earthworm breeding cooperative, the green industrial chain of earthworm breeding has a broad market prospect and has been paid much attention. Earthworms are of high medicinal value, and the sun dried earthworms are sent to the pharmaceutical factory. The price of the earthworms is 80 thousand to 100 thousand yuan per ton. This year, the co-operatives made a total of 500 thousand yuan for the production of earthworms. Next year, Yu Lin earthworm breeding cooperatives will continue to expand the scale of the industry, driving more farmers in the vicinity of earthworms. At present, the co-operatives can consume 1 /4 of sludge in the paper mill. In the future, cooperatives should cultivate more earthworms, eat all papermaking sludge, bring more environmental benefits, and make earthworm farmers have greater economic returns.