Hangzhou Xiaoshan District Sewage "Mystery": Printing And Dyeing Enterprises Use Banned Dyes?

< p > recently, the news of "a href=" http://sjfzxm.com/news/index_p.asp "Shanxi" aniline pollution "/a" continued to ferment.

The incident caused the "common people" of the Jin, Hebei and Henan provinces to "contact" the chemical products of aniline so closely. If it were not for this incident, some people would not even hear the name of this chemical product even for a lifetime.

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< p > in the < a target= "_blank" href= "http://www.91se91.com/" > textile < /a > printing and dyeing developed Northern Zhejiang, most of the "industry" people are not familiar with this noun.

Aniline is one of the most important intermediates in the dyestuff industry. It can be used to produce many kinds of acid dyes and organic dyes in the dyestuff industry. It is used in dyeing and printing industry as an important raw material for dyeing aniline black, aniline or pesticide.

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< p > in Xiaoshan Linjiang Industrial Park, Hangzhou, there are many large and small chemical enterprises and printing and dyeing enterprises.

It is understood that printing and dyeing enterprises in the printing and dyeing production wet process, is the entire textile production pollution the largest and most water consumption steps.

The sewage discharged by these enterprises is treated uniformly by the sewage treatment plant in Linjiang Industrial Area, and finally discharged into the Qian Tang river.

However, the water entering the sewage treatment plant contains a large amount of pollutants such as aniline.

Experts said that some enterprises do not exclude banned dyes.

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< p > > strong > black river vortex < /strong > < /p > by Qian Tang river.

< p > December 19, 2012, when the reporter took two hours, he came to the party bay town in the eastern part of Xiaoshan district from Hangzhou.

As soon as I got off the train, I felt the smell of discomforting chemical products everywhere in Dang Wan Town.

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< p > 2:00 p.m., under the guidance of the insider, the reporter went to find the huge "sewage outfall" beside Qian Tang river.

According to the insider, the sewage outlet is half an hour's drive from the town of Dang Wan, located near the Qian Tang River, not far from the junction of Xiaoshan and Shaoxing.

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< p > along the "red fifteen line" road to the end, and northward for hundreds of meters, in a sand road leading to the river for more than ten minutes, came to the Qian Tang river embankment next to.

In front of it was a pile of stones. The reporter got off the road and went to the edge of the dyke. It was found that there was a huge stone block on the side of the river.

Without approaching the channel, the reporter smelled a pungent smell.

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< p > climb cautiously from the stone, and the wide Qian Tang river is displayed.

Just below the reporter's stand, there is a sharp contrast to the somewhat cloudy Qian Tang river. There is a huge outlet of black water.

Due to the high tide of the Qian Tang River, the tidal water flowing upstream and the black water flowing out of the black water outlet form a huge whirlpool, with dark brown water in the middle, surrounded by dirty bubbles, like a huge "Taiji diagram".

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< p > Mr. Yu (a pseudonym) is a farmer on the riverside of Qian Tang. He has contracted fish ponds along the river.

He told reporters that because of the high tide now, it is not obvious that black water is flowing outward. He often smells the smell of the water here sometimes, and it can choke back tears.

He suggested that reporters tomorrow before the high tide, the sewage discharged like black springs outward.

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< p > second days, around 11 a.m., the reporter called the 12369 environmental protection hotline, and contacted the environmental protection sub Bureau of Xiaoshan District of Hangzhou.

A director of the gold base contacted the reporter and said he knew the place where the sewage outfall was the drainage outlet of Linjiang sewage treatment plant.

And make an appointment with the reporters to go to the sewage outfall.

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< p > noon around 12:40, the reporter came to Qian Tang river.

The director of gold, who has been waiting here, told reporters that this is the sewage outfall of Linjiang sewage treatment plant, and the water discharged is not exceeding the standard.

Because there was no high tide, the reporter saw that the water at the sewage outlet was more like a huge hot spring that turned outwards. The brown water was billowing outwards with heat and poured into the Qian Tang river with thick foam.

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< p > reporters walk down the stones and come to the river where the sewage near the river is not far from the sewage outlet.

The sewage flows through the gap of the stone, and the color is like strong black tea.

Pick up a colorless pure water bottle to collect water samples, the water has a certain degree of heat.

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< p > < strong > a large number of < a href= "http://cailiao.sjfzxm.com/Matertial/show/default.aspx > aniline > /a >" substances "unknown origin > /strong > /p >

Part P is the sewage discharged from the huge sewage outfall of Linjiang sewage treatment plant.

In Xiaoshan District, there are three printing and dyeing enterprises in Dang Wan Town, including Tian Yu, Tian Rui, Tiancheng, and so on.

The sewage discharged by these enterprises is concentrated on the sewage treatment plant in the town of Dang Wan for preliminary treatment, and then pported to the Linjiang sewage treatment plant for processing.

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< p > it is understood that the design capacity of the Dang Bay sewage treatment plant is 60 thousand tons per day, and now it handles about 42 thousand tons of sewage every day.

Linjiang sewage treatment plant staff told reporters that the daily processing capacity of Linjiang sewage treatment plant is 300 thousand tons, and the actual daily processing is 27 tons.

Reporters observed their online monitoring data, only pH, COD, five day biochemical oxygen demand, total nitrogen, total phosphorus and other five indicators, the results showed that they did not exceed the relevant emission standards.

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< p > Hangzhou Xiaoshan District Environmental Monitoring battalion captain Yang Zhengjian told reporters that the sewage discharged from Linjiang sewage treatment plant has been strictly monitored, and Xiaoshan district environmental protection sub bureau also conducts regular sampling checks, and all indicators meet the emission standards.

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< p > Yang Zhengjian provided two test results for two samples in April 9, 2012 and November 1, 2012, and 17 indexes were not exceeded.

But the reporter noted that in April 9, 2012, the mean value of "aniline" in the influent was 4.88mg/L, and the mean value of aniline in the influent samples was 5.05mg/L in November 1, 2012.

Taking the data of the sample survey in November 1, 2012 as an example, the gross daily handling capacity is 270 thousand tons, and the content of aniline substances in the sewage discharged into the sewage treatment plant is as high as more than 1360 kilograms per day.

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< p > the sources of sewage from Linjiang sewage treatment plant are mainly printing and dyeing and chemical enterprises.

The current situation is that the centralized sewage treatment mode in the park results from the unclear information of the sewage plants in the park, and which factory can not identify the "aniline" substances.

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< p > < strong > who is using banned dyes? < /strong > < /p >.

< p > aniline is one of the most important aromatic amines.

Decomposable aromatic amine dyes are dyes synthesized from carcinogenic aromatic amines, commonly known as banned azo dyes.

The draft document on restrictions on the use of partial azo dyes by the European Union has attracted great attention from the Chinese dyestuff industry.

GB18401 National Textiles basic safety technical specification stipulates the use of dyes, and prohibits the use of dyestuffs that can decompose 24 kinds of harmful aromatic amines.

Reporters learned that 24 kinds of banned carcinogenic aromatic amines, more than 10 kinds of aniline substances.

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"P", Professor Xi Dan Li, director of the environmental protection technology Specialized Committee of the China dyeing and Printing Association, said in an interview with reporters that the index of influent reached about 5, indicating that some enterprises were using prohibited azo dyes.

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< p > it is understood that azo dyes can decompose and release more than 20 aromatic amines with certain carcinogenesis under certain conditions. When the dye is in contact with human body, its harmful components are absorbed by the skin and spread in the human body, and then mixed with the substances released in the normal metabolism of human body.

Under special conditions, 20 kinds of carcinogenic aromatic amines can be decomposed to form carcinogenic aromatic amine compounds. After activation, the DNA structure of human body is changed, causing pathological changes and inducing malignant tumor substances, leading to malignant diseases such as bladder cancer, ureteral cancer and renal pelvic carcinoma.

In addition to hurting human health, a large number of pollutants will be discharged during the production of "banned azo dyes", resulting in serious environmental pollution.

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< p > Professor Xi Dan Li said that in fact, only a small fraction of the azo dyes are restricted to the EU, and aniline group is possible in the dye products, but no aniline is precipitated.

Other dyes may produce aniline substances during the degradation process, so the effluent discharge standard set such an index.

As a matter of fact, if prohibited dyes are not used, aniline should not be used, but it is not fully stated that no use will be made in the future.

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< p > recently, the test results released by Beijing industry and Commerce Bureau showed that the decomposition of carcinogenic aromatic amine dyes in individual textiles did not meet the standard requirements.

The National Textiles "a target=" "_blank" href= "http://www.91se91.com/" > clothing < /a > product quality supervision and inspection center has also tested 1051 samples from 20 enterprises in the country, and found that about 6% of the samples contain a highly carcinogenic decomposable aromatic amine dyestuff which is prohibited by textiles, of which 2% of the samples (about 21) also detected a high carcinogenic substance diphenyl amine exceeding the standard, the most serious one exceeded the standard of 190 times.

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< p > Professor Xi Dan Li said that the printing and dyeing industry now knows what is good and what is not easy to use, so long as the responsible unit will not buy this dye.

As for the phenomenon of "aniline" content in sewage, which is about 5 mg/L, he said, "if it is so high, it shows that there is a problem in its use, indicating that it has used this kind of thing."

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< p > Xi Dan Li said that there will be prohibited substances in dyes and auxiliaries. For general users, it is not necessarily clear.

After knowing the business, they should check these things. After checking, they will not be used.

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< p > but according to the two test results provided by Xiaoshan District Environmental Protection Bureau, the detection results of aniline from April 2012 to November are more than 5 mg/L.

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Less than P, Xi Dali also reluctantly said that, according to reason, banned dyes can not be used, but no one is still using, and now dare not say.

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