30% Printing And Dyeing Enterprises In Shaoxing Still Do Not Use Biochemical Technology.

< p > core hint: printing and dyeing sludge will be randomly stolen into roadside farmland. One argument is that the outlet problem of printing and dyeing sludge has not been effectively solved, and the production of printing and dyeing sludge is much higher than that of our city.

If we can reduce the production of printing and dyeing sludge from the source, the pressure of subsequent disposal of printing and dyeing sludge will also be greatly reduced.

< /p >

At present, biochemical treatment of sewage is regarded as the most effective way to reduce sludge production. P

Examples and data show that this way brings much less sludge than physicochemical treatment.

The environmental protection department also believes that the standard of printing and dyeing enterprises should meet the new standard 200mg/L stipulated by the state, and biochemical technology must be used to treat sewage.

< /p >

< p > however, the reality is that at present, 30% printing and dyeing enterprises still do not use biochemical technology to treat sewage.

Behind this reality, what kind of confusion is it that makes these enterprises hesitate? < /p >

< p > two emission reduction cases < /p >

< p > "bacteria eat sludge" < /p >

< p > sludge yield decreased significantly < /p >

< p > what is biochemical treatment? For this reason, Yang Ying, deputy director of the Environmental Protection Bureau of Jinghu, has made a popular explanation to reporters.

The so-called biochemical treatment is biological chemical treatment, the core content is to let bacteria "eat" sludge.

< /p >

< p > reporter noted that since 2009, many printing and dyeing enterprises in Shaoxing have exposed many classic examples of using biochemical methods to treat sewage to reduce sludge production.

< /p >

< p > in 2008, YOUNGOR Shengzhou yarn dyed Weaving Technology Co., Ltd. introduced the intervention of Bacillus subtilis from Taiwan.

The sewage treatment process is that all the sewage enters the neutralization tank, and the system automatically neutralizes the sewage according to the pH value of the Bacillus subtilis.

Under the supporting conditions such as blowing oxygen, Bacillus subtilis repeatedly decomposes sewage.

< /p >

< p > according to Liu Xuefeng, head of the equipment department of Shengzhou YOUNGOR yarn dyeing technology Co., Ltd., the daily sewage generated by the company is about 3500 tons. After the treatment of sewage by Bacillus subtilis, the output of the sludge is almost zero, and the COD index is also reduced to less than 250mg/L.

From the cost point of view, the initial purchase of about 500 kg of Bacillus subtilis and PU membrane (Bacillus natto growth) cost more than 20 yuan, and after running for a year and a half, "YOUNGOR yarn dyed fabric" almost no big input.

< /p >

< p > here, Bacillus subtilis introduced from YOUNGOR yarn dyed fabric is fermented from soybean raw materials, and can be used as feed accelerant, soil amendment, biological organic fertilizer and so on. At the same time, it can be applied to the sewage treatment industry because of its rapid propagation and adaptability to environment.

This is a typical biochemical treatment technology.

< /p >

< p > Shaoxing's Jin Xiang Hui < a target= "_blank" href= "http://www.91se91.com/" > textile < /a > printing and dyeing Co. Ltd. adopts the same technology as YOUNGOR's yarn dyed weaving technology.

< /p >

The method of < p > "Jin Xiang Hui" is to put a lot of fungi in the sewage pond. The bacteria quickly eat the chemical substances in the sewage under the action of oxygen. The concentration of COD (chemical oxygen demand) of the original sewage is greatly reduced, and it can basically be reduced to 10mg/L.

According to the person in charge of the company, the amount of sewage produced by the enterprise is 10 thousand tons per day. According to the traditional way of processing, they produce fifty or sixty tons of sludge a day, and now only two or three tons, with a difference of more than 20 times.

< /p >

< p > two methods: < /p >

< p > the effect is several times to several times, < /p >.

< p > in the end, in terms of reducing the production of printing and dyeing sludge, the biochemical way of "let the bacteria eat the sludge" is superior to the traditional physicochemical way (physical and chemical methods)? Different people have different opinions.

< /p >

< p > according to the person in charge of the environmental protection technology company of Shaoxing, which is responsible for the "Jin Xiang Hui" sewage treatment, the amount of sludge produced by the traditional way is 6%, while the amount produced by biotechnology is only 0.2%. The example of "Jin Xiang Hui" seems to confirm this data.

< /p >

< p > according to the person in charge of dyeing and printing enterprises who do not want to disclose their names, even if the same biochemical treatment method is used, the amount of printing and dyeing sludge produced by different printing and dyeing wastewater is also very different.

< /p >

< p > the person in charge said that according to the data he had grasped, the amount of sludge could only be up to 3% by physicochemical treatment of printing and dyeing wastewater, and about 1% of sludge could be produced by biochemical and physicochemical treatment. If combined with two methods, each treatment of 1000 tons of dyeing and finishing wastewater would produce 10 tons of wet sludge and 1.5 cubic meters of dry sludge after dewatering.

Taking a daily processing plant of 10 thousand tons of dyeing and finishing wastewater as an example, there are about 15 cubic meters of dry sludge produced every day.

< /p >

< p > how high is the efficiency of treating sludge with biochemical technology? Zhao Sihai, director of the Environmental Protection Bureau of Bao Jiang, compared it with reporters.

< /p >

< p > "generally speaking, the amount of sludge produced by physicochemical treatment of sewage is about 3% to 7%. If the sewage is treated by biochemical means, the amount of sludge generated will be less than 3%."

Zhao Sihai said that no matter how it was used, the amount of sludge produced by biochemical treatment of sewage would be much less than that of sewage treated by physicochemical treatment.

< /p >

< p > two cost annoyance < /p >

< p > tens of millions of fees are less than /p.

< p > business pressure is great. < /p >

< p > since there is such a good effect, why do 30% of the printing and dyeing enterprises do not treat the sludge in biochemical way? What makes them reluctant to use it? < /p >

< p > reporters learned from many interviews that the primary factor restricting the wider use of biochemical methods for sewage treatment is the cost problem.

This cost is not only the cost of capital, but also the cost of time.

< /p >

< p > the cost of capital, tens of millions of dollars in equipment and acquisition of bacteria, and so on, often overburdened enterprises.

Take "Jin Xiang Hui" and "YOUNGOR yarn dyed fabric" as an example. "Jin Xiang Hui" spent about 20000000 yuan on purchasing this set of processing equipment, and the strain introduced from YOUNGOR in Taiwan is now about 300 thousand yuan per ton, and when the strain is used up, the strain will need to be bought and the processing cost will not be low.

< /p >

Zhao Sihai, director of the Environmental Protection Bureau of Bao Jiang, told reporters that in general, the investment in sewage disposal by biochemical methods can be calculated by 1000 yuan per ton of daily sewage treatment. P

Based on this data, if a printing and dyeing enterprise produces tens of thousands of tons of sewage, then the cost of the biochemical technology and equipment will be more than ten million yuan.

Obviously, many printing and dyeing enterprises have reached the sewage discharge volume in reality.

< /p >

< p > Chen Guohe, a postdoctoral fellow in Environmental Science in Xiamen University and a teacher in the Faculty of Biomedical Sciences, Shaoxing University, told reporters that it is for this reason that some small businesses that produce little sludge are reluctant to use biochemical methods to treat sewage, resulting in an effective reduction in the total amount of printing and dyeing sludge in our city.

< /p >

< p > the time needed for bacteria to eat sludge is less than /p.

< p > enterprises can not wait? < /p >

< p > another cost is time cost.

< /p >

Chen Guohe, who has been studying the printing and dyeing sludge, said that most printing and dyeing enterprises have their own sewage treatment ponds. The treatment pond usually just stores the sewage discharged every day, but the biochemical technology can treat the sewage, and the bacteria often need at least 48 hours or even 72 hours.

"That is to say, bacteria often eat sludge for two or three days, and the effluent of printing and dyeing enterprises is discharged every day. For ordinary enterprises, the sewage pool can not be expanded on a large scale."

< /p >

< p > "the most important thing is that many of the strains introduced in biochemical technology should also be adapted to experiments. That is to say, the environment is not suitable for using this bacterium, and it will be known only after the experiment."

Chen Guohe said that enterprises are highly efficient and can not afford to wait for this time.

"Enterprises generally only use mature technology to do experiments on immature things, they think this is a laboratory matter."

< /p >

< p > in fact, the effect of biochemical technology is not perfect.

< /p >

< p > Chen Guohe told reporters that bacteria and microbes have their own lifespan, usually about three days. When these bacteria and microbes die, they produce organic sludge.

"That is to say, biochemical methods can only reduce and not completely avoid sludge generation."

In addition, bacteria and microorganisms can only eat organic sludge instead of heavy metals in sludge.

According to Yang Jian, director of the municipal solid waste management center of the Environmental Protection Bureau, there are also exhaust gas generation in the process of biochemical treatment, which affects the treatment effect.

< /p >

< p > precisely because of these factors.

Many enterprises still use the combination of physicochemical and biochemical methods to treat printing and dyeing wastewater.

< /p >

< p > two suggestions for pollution control < /p >

< p > technical innovation < /p >

< p > with appropriate subsidy < /p >

< p > is it feasible? < /p >

< p > how to reduce the printing and dyeing sludge from the roots? Chen Guohe believes that besides printing and dyeing enterprises in a comprehensive way to promote the biochemical treatment of printing and dyeing wastewater, the most important thing is to improve the biochemical methods to reduce the sludge capacity and reduce the cost of biochemical treatment of sewage, and this is a need for technological innovation.

< /p >

< p > "as an enterprise, its biggest goal is to maximize profits. Enterprises are not interested in technological innovation until it is too late. Chen Guohe believes that in addition to encouraging technological innovation in all aspects, government departments should also subsidize enterprises that actively deal with sewage and reduce sludge.

< /p >

< p > reporter learned from the environmental protection department, for printing and dyeing wastewater treatment, our city has not yet issued corresponding policies to subsidize enterprises.

And the Xiaoshan District of Hangzhou, which is adjacent to us, seems to have this policy.

< /p >

< p > some people believe that there are many printing and dyeing enterprises in Xiaoshan District, but there is no large-scale phenomenon of printing and dyeing sludge being stolen. The reason is that the local government has paid special subsidies to the printing and dyeing sludge disposal, and there are more kinds of sewage treatment companies.

< /p >

< p > however, environmentalists believe that subsidies can not be the reason for enterprises to steal and print sludge.

"If enterprises want to make money, they should also assume corresponding social responsibilities and take the initiative to reduce the occurrence of pollutants."

< /p >