Reporter'S Visit: Solution Of Water Pollutants Discharge Standard In Leather Making And Fur Processing Industry

< p > < strong > 1, setting up < a href= "http://sjfzxm.com/news/index_s.asp > tanning and fur processing industrial water pollutants emission standard < /a > background. < /strong > /p >

Since the reform and opening up, with the improvement of people's living standards and the increasing demand for leather, China's leather and fur processing industry has been developing rapidly, becoming the pillar industry of China's light industry, and has become the world's largest producer of leather products. P

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< p > a href= "http://sjfzxm.com/news/index_s.asp" > leather making > /a > fur processing industry is also a polluting industry in light industry. It has a series of problems, such as large discharge capacity, complex sewage components, different environmental awareness of enterprises, uneven pollution treatment and low promotion of cleaner production.

At present, 1.6 tons of wastewater, about 404 thousand tons of COD, 16 thousand tons of ammonia nitrogen and 1280 tons of total chromium (trivalent chromium) are produced in the industry of tannery and < a href= '> http://sjfzxm.com/news/index_s.asp > /a >. After treatment, waste water is about 1.38 million tons, COD about 30 thousand tons, ammonia nitrogen 7300 tons, and total chromium (trivalent chromium) 6.72 tons.

To this end, the Ministry of environmental protection decided to formulate the "discharge standards for water pollutants in leather making and fur processing industry" according to the characteristics of the industry.

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< p > < strong > 2, compared with the current standards, what are the main changes in the discharge standard of water pollutants in tanning and fur processing industry? < /strong > < /p >

< p > at present, the tanning and fur processing industry implements the comprehensive wastewater discharge standard issued in 1996 (GB 8978-1996).

In comparison, the effluent standard of tanning and fur processing industry has the following characteristics: < /p >

< p > one is to consider the characteristics of the industry more comprehensively.

For example, < a href= "http://sjfzxm.com/news/index_s.asp > > sewage discharge standard < /a > CODCr, BOD5 and other indicators have stipulated the applicable limits of leather industry, but other characteristic pollutants are implemented according to" other sewage units "or" all pollutant discharge units ".

The new standard has clarified the pollutants in tanning and fur processing industrial wastewater and improved the pertinence.

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< p > two is the "sewage comprehensive discharge standard" set the three level emission limits according to the direction of sewage discharge, which not only causes unfair competition among enterprises, but also is not conducive to the total amount control of regional pollution.

The new standard provides direct and indirect emission limits according to the technical level of water pollutants treatment in the industry. Heavy metals and other highly toxic pollutants are directly and indirectly discharged with the same limit.

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< p > three, during the leather making process, a large number of a href= "http://sjfzxm.com/news/index_s.asp" > collagen < /a > were produced. After hydrolysis, they became organic ammonia nitrogen, nitrate nitrogen and nitrite nitrogen, which were easy to cause eutrophication. The new standard set up the total nitrogen control index.

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< p > four is the salt preservation and processing of raw leather for leather making and fur processing. The new standard has added chloride ion control index.

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< p > five is the industry feature that takes full consideration of wet storage of raw materials and improves the maximum allowable discharge water index.

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< p > > strong > 3, what are the costs and benefits of implementing the effluent standard for leather and fur processing industry? What are the costs and benefits? < /strong > /p >

< p > the overall control requirements for the discharge standards of water pollutants in tanning and fur processing industry are equivalent to the average emission control level in developed countries.

After the implementation of the standards, it is estimated that the total COD and NH3-N emissions will be reduced to 11800 tons and 2380 tons respectively, 57.2% and 67.4% less than that in 2010.

The implementation of the new standard requires that tannery and fur processing industry increase environmental input. It is estimated that investment in upgrading and upgrading of sewage treatment facilities will cost nearly 2 billion yuan, and the annual running cost will be about 1 billion 700 million yuan.

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< p > comprehensive environmental benefits and investment intensity, the standard cost is reasonable.

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< p > < strong > 4, what will be the impact of the implementation of the new standard? < /strong > < /p >

< p > the new standard has increased the entry threshold for the industry. The implementation of the new standard will accelerate the elimination of backward production capacity, and urge a group of enterprises that are backward in production equipment, low in technological level, imperfect in environmental pollution control facilities, and small and weak in the market.

It is estimated that about 10% of the leading enterprises (above 200 thousand sheets of cattle hide or more) need to further strengthen environmental management and upgrade some of the links. About 45% of the medium enterprises (above 50 thousand mark sheets and cattle hide) need upgrading and upgrading. Some enterprises with difficulties in upgrading and upgrading will face the pressure of elimination. About 45% of the small enterprises (below 50 thousand scales of cattle hide) will be eliminated.

The market orientation of the new standard is consistent with the national industrial policy. It is of great significance to promote the leather making processing industry to adjust its structure, change its growth mode, promote cleaner production and technological progress in pollution control.

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What measures do P < strong > 5, leather making and fur processing enterprises need to take in reaching the standard? < /strong > < /p >

< p > enterprises should take full process control measures to prevent and reduce the generation and emission of < a href= "http://sjfzxm.com/news/index_s.asp" > pollutants > /a >.

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< p > in cleaner production, it includes the preservation and preservation of raw skins, the processing of fresh skins, the preservation of low salt, the hair removal, the high absorption of chrome tanning, the less chrome tanning, and the reduction of salt consumption in tanning process.

In terms of pollution control, including classifying the trivalent chromium and sulfide, and focusing on simultaneous reduction of COD and denitrification, the two stage A/O process can be selected; hydrolysis acidification + oxidation ditch + ozone oxidation + biological aerated filter; hydrolysis acidification (anaerobic) + A/O process; hydrolysis acidification + aerobic oxidation + SBR process.

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