Organic Pigment Wastewater Becomes Enemy of Environmental Protection
The reporter learned from the 2007 national organic paint industry annual meeting held on August 10th that the wastewater generated during the production of organic pigments has become the main killer of environmental protection. Whether or not it can be used to treat waste water has become a key issue for the survival and development of the organic pigment industry. However, at present, there is still a lack of technologies that are effective and cost-effective.
It is understood that the overall performance of organic pigments is superior to that of inorganic pigments, and they are widely used in industries such as coatings, inks, and plastics, and have developed rapidly in China in recent years. However, organic pigments discharge organic waste water, dust, and exhaust gases during the production process, which poses great risks to human health, aquatic products, and agricultural crops. Among them, organic wastewater is the most dangerous and its treatment is also the most difficult problem. According to statistics, in 2005, the total amount of industrial organic wastewater discharged nationwide was 24.31 billion tons, of which the waste water discharge of organic pigments was also estimated to be more than 9 million tons.
According to Wang Wei, director of the China National Dyestuff Industry Association, the organic wastes of organic pigments contain a variety of pollutants, some of which are as high as tens of thousands of mg/L. According to the national "Comprehensive Emission Standard for Wastewater", the first-class standard for ammonia nitrogen emission is 15mg/L, and the secondary standard is 50mg/L. Therefore, the wastewater of the organic pigment industry has become one of the culprits of environmental pollution. The most difficult problem is that if conventional biological treatment technology is used to treat organic wastewater, although the technology is mature and the processing cost is within an acceptable range (only 1 to 3 tons is required for treatment), this technology will have high ammonia nitrogen concentration. Down to 1000mg/L is already the limit level, or can not meet the emission standards of the organic pigment industry. However, newly developed technologies such as carbon adsorption and membrane separation can reduce the ammonia nitrogen content to less than 50 mg/L. However, the cost is high and the equipment life is short. Enterprises cannot use it.
The reporter learned that at present, there are three kinds of organic waste Water Treatment methods used by domestic organic pigment manufacturers: First, biological treatment technology is used to dilute high-concentration organic wastewater with municipal life sewage. Although the indicator on the surface of pollutant emissions is still satisfactory, it does not solve the problem fundamentally. The second is to relocate and build factories in different places and shift to the relatively loose Central and Western regions where environmental protection policies are relatively relaxed. This is obviously escaping the issue. The third is simply to exceed the standard emissions through various means.
Delegates believe that the key to eradicating the pollution problem in the organic pigment industry is to develop a number of advanced, mature and lower cost organic wastewater treatment technologies.
It is understood that the overall performance of organic pigments is superior to that of inorganic pigments, and they are widely used in industries such as coatings, inks, and plastics, and have developed rapidly in China in recent years. However, organic pigments discharge organic waste water, dust, and exhaust gases during the production process, which poses great risks to human health, aquatic products, and agricultural crops. Among them, organic wastewater is the most dangerous and its treatment is also the most difficult problem. According to statistics, in 2005, the total amount of industrial organic wastewater discharged nationwide was 24.31 billion tons, of which the waste water discharge of organic pigments was also estimated to be more than 9 million tons.
According to Wang Wei, director of the China National Dyestuff Industry Association, the organic wastes of organic pigments contain a variety of pollutants, some of which are as high as tens of thousands of mg/L. According to the national "Comprehensive Emission Standard for Wastewater", the first-class standard for ammonia nitrogen emission is 15mg/L, and the secondary standard is 50mg/L. Therefore, the wastewater of the organic pigment industry has become one of the culprits of environmental pollution. The most difficult problem is that if conventional biological treatment technology is used to treat organic wastewater, although the technology is mature and the processing cost is within an acceptable range (only 1 to 3 tons is required for treatment), this technology will have high ammonia nitrogen concentration. Down to 1000mg/L is already the limit level, or can not meet the emission standards of the organic pigment industry. However, newly developed technologies such as carbon adsorption and membrane separation can reduce the ammonia nitrogen content to less than 50 mg/L. However, the cost is high and the equipment life is short. Enterprises cannot use it.
The reporter learned that at present, there are three kinds of organic waste Water Treatment methods used by domestic organic pigment manufacturers: First, biological treatment technology is used to dilute high-concentration organic wastewater with municipal life sewage. Although the indicator on the surface of pollutant emissions is still satisfactory, it does not solve the problem fundamentally. The second is to relocate and build factories in different places and shift to the relatively loose Central and Western regions where environmental protection policies are relatively relaxed. This is obviously escaping the issue. The third is simply to exceed the standard emissions through various means.
Delegates believe that the key to eradicating the pollution problem in the organic pigment industry is to develop a number of advanced, mature and lower cost organic wastewater treatment technologies.
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