Promotion Of "Green Leather" New Technology In Xinji Leather Industry

In 2010, among the eight enterprises in Hebei leather industry that needed to eliminate backward production capacity, the "bull's-eye" was "drum". Nowadays, most enterprises have eliminated the old drum and purchased the new drum with advanced technology. However, Hebei Dongming Industrial Group Co., Ltd. has fought a "renovation battle" relying on technological innovation.

"The 18 rolls that this enterprise will eliminate have been upgraded and transformed into new ones to turn waste into treasure." Xinji City Industrial Promotion Bureau concerned responsible person told the reporter.

It is understood that in the past, in the preparation process of cattle hide tanning, cattle hair was burned and discharged with wastewater, which was an important factor for the high concentration of chemical oxygen demand. Now using the wool preservation method, the cow's hair is completely filtered out and turned into raw materials for the production of organic nitrogen fertilizer and nitrogen-based acid. In the past, chrome liquor produced in leather tanning process was a heavy pollution source, and how to control it was a big problem. New technology is now in use & mdash& mdash; Over load drum hair protection unhairing method and energy saving of Liming and chrome tanning wastewater recycling environmental protection All problems can be solved easily.

"The Liming wastewater and chrome tanning waste liquid produced by the tanning workshop are collected through special pipelines for solid-liquid separation, precipitation treatment and test proportion, and then recycled. This is our company's source control tannery wastewater discharge technology. " Dongming company general manager Xie Shenghu said.

As early as 2006, Dongming company invited professors from Shaanxi University of science and technology and well-known domestic leather experts Wei Shilin and Liu Zhenhua to take the lead in technical research and development. The company invested 2 million yuan in special research and development funds. On the basis of digesting and absorbing domestic and foreign leather making clean technology and wastewater treatment technology, Dongming company has overcome the chemical screening and application methods, the operation of overload drum, and the operation of overload drum There are 135 technical problems such as the recycling and treatment of waste water, forming the system technology integration of overload drum hair protection unhairing method and the recycling of Liming wastewater and chrome tanning waste liquid. In order to promote energy conservation and emission reduction, Xinji has promoted this technology in the city's tannery enterprises, and has been used by 14 tannery enterprises.

According to the relevant person in charge of the Management Committee of Xinji tanning Industrial Zone, they supervised the enterprises to achieve the goal of "separate storage by enterprises, transportation by special vehicles of sewage treatment plants and centralized treatment", and vigorously promoted new technologies and new equipment such as recycling of chromium liquor and alkali liquor, ash free expansion and water-saving drum. The water consumption for tanning will be saved by more than 1 / 3, the tannery sludge will be reduced by 80%, and the chromium liquid, alkali liquor and other new technologies and equipment will be vigorously promoted The discharge of alkali liquor was reduced by 70%. In particular, the tannery wastewater recycling technology project developed by Dongming group won the first prize of national energy conservation and emission reduction. By guiding enterprises to adopt chrome free tanning, chrome free tanning leather has accounted for more than 70% of the total leather, which is worthy of the name“ Green leather ”。