How To Find A Way Out For Printing And Dyeing Sludge?

Over the past few days, this newspaper has continuously reported on the dumping of printing and dyeing sludge by some enterprises, causing widespread concern from all walks of life. No matter in the network forum or in the reporter's interview, everyone condemns such acts of stealing sludge and polluting the environment. But what we need more attention is how to find a way out for printing and dyeing sludge under the condition of insufficient centralized disposal capability.

In addition to concentrating on incineration, what ways can Shaoxing's printing and dyeing enterprises deal with sludge at present? Are these methods feasible and cost-effective? Yesterday, our reporter went to the printing and dyeing enterprises and the environmental protection department for an interview.

Way one: making brick making raw materials

Disadvantages: "digestion" is limited, and supervision is not reliable.

The sewage and sludge were separated and dried by dewatering equipment, and the cinder and dyeing sludge were stirred. The mixture was sent to the brick factory by truck. This is a scene seen by reporters in a sludge treatment workshop of a printing and dyeing enterprise in Jinghu new area.

"The concentration of COD in the effluent of printing and dyeing enterprises has dropped from original 1000mg/L to 500mg/L, and then dropped to 200mg/L this year. With the increase of standards, the amount of sludge after sewage treatment is also increasing. The head of the company, Mr. Dai said that before their printing and dyeing sludge produced about 1 tons per day, they could be incinerated by themselves, but now there are 5 tons to 6 tons of printing and dyeing sludge every day, and only a new way can be found.

Because the coal to gas has not yet been completed, the company's production of fuel is still dominated by coal, the by-product of coal combustion is cinder, which is the raw material needed by brick and tile factory. Mr. Dai said that they used to sell coal cinder to brick and tile mill, which can be sold for about about 200000 yuan a year, but now they are replaced.

"However, delivery is also conditional." Mr. Dai told reporters that because of sludge disposal, the company signed a contract with brick and tile factory. It could only mix sludge into cinder to brick and tile factory. A small amount of sludge was burned with coal cinder as raw material for brick making, and harmless disposal of sludge was also carried out. "The advantage of mixing two materials after mixing is to eliminate the possibility of brick and tile factory dumping at will." The official said that in order to ensure that the mixture of cinder and sludge transported to the brick factory was not stolen, they also sent people to check, and asked the other party to write a receipt to ensure that the total amount of transported and transported to the printing and dyeing sludge mixture was the same.

Reporters learned that similar to the practice of printing and dyeing enterprises, in fact, in the areas of Shaoxing, Po, and other printing and dyeing enterprises are also widely used. Zhao Sihai, director of the Environmental Protection Bureau of Bao Jiang, told reporters that for example, some of the printing and dyeing enterprises of the rojiang River transported the printing and dyeing sludge to brick and tile factory in Huzhou and Jiaxing. "But the amount of" digestion "in brick factories is limited, and at the same time, it depends on the sense of responsibility of enterprises, which is not a fundamental policy.

Way two: self combustion of enterprises

Disadvantages: it may pollute the air, and the conditions are disappearing.

"Some other businesses are burning themselves," Zhao Sihai told reporters. In this regard, Qing Mao Spin Printing and dyeing Co., Ltd. is relatively standardized.

Reporters in the "Qing Mao" interview, the company's general manager assistant Yu Jianliang told reporters that their enterprises use power plant boilers, the company produces daily printing and dyeing sludge has 7 to 8 tons, basically can burn through their own completion.

But Yu Jianliang disclosed that in the process of "coal to gas", enterprises should change the way of using coal-fired boilers. "After the boiler is switched off, the treatment method that the enterprise will burn the printing and dyeing sludge mixed with coal will not work, so the enterprises that use this way to treat printing and dyeing sludge will be reduced."

According to statistics, there are more than 200 printing and dyeing enterprises in Shaoxing County, and 1700 tons of printing and dyeing sludge are produced every day. There are also 50 printing and dyeing enterprises above Designated Size in the urban area. The sludge generated every day is about 400 tons. With the addition of both, the total number of sludge produced by printing and dyeing enterprises is as high as 2100 tons per day. However, at present, the specialized company that handles sludge in Shaoxing is only Shaoxing central recycling Energy Developments Ltd, and Shaoxing's sludge disposal project has not yet been run.

Kong Weize, a solid waste center of the Municipal Environmental Protection Bureau, said that only 1000 tons of sewage sludge were treated in the central sewage treatment plant.

"Self combustion equipment conditions may cause air pollution". Some people believe that the purpose of "coal to gas" is to improve air quality. With the advance of this measure, we must find a new way for industrial sludge disposal.

Environmental protection department:

Accelerating sludge disposal projects

Implementing the "five unification" system

It will be the fundamental policy.

In the view of the environmental protection department, the most urgent task is to improve the sludge disposal capacity and really regulate the disposal of printing and dyeing sludge in the system.

Reporters learned from the Municipal Environmental Protection Bureau, Shaoxing central recycling Energy Developments Ltd a day processing 2000 tons of sludge drying projects and related projects are already in progress, before the end of this year or will be completed, then the city's daily 400 tons of printing and dyeing sludge also has a "digestion" channel.

Shaoxing county is currently building a "long de environmental protection" sludge treatment project, which is expected to be put into operation in October. After the completion of the project, most of the printing and dyeing sludge in Shaoxing county can be "digested". Shengzhou invested 35 million yuan to build a sludge incineration project with a daily capacity of 250 tons.

Standardizing the discharge of printing and dyeing sludge is regarded as the most effective way to effectively curb the dumping of printing and dyeing sludge. The "five unification" system, which will be formally implemented in August, is the core of the system.

It is reported that the "five reunification" includes unified account, unified transportation, unified disposal, unified price and unified settlement. Sun Ying, deputy director of Jinghu Environmental Protection Bureau, said that the most powerful weapon in the "five unification" is unified settlement.

"The core of unified settlement requires printing and dyeing sludge transportation enterprises to pay a fee in advance, and only by printing and dyeing sludge disposal can the transport enterprise get the funds." Sun Ying, if such a system is implemented, there is no room for profit from stealing and printing sludge. "Now we steal it to save costs, and we will lose our freight if we steal it in the future."

Mr. Dai also approved the way of unified disposal. Although biochemical methods can reduce sludge production, unified disposal is obviously better. "Sludge is a big problem. It is legal liability to deal with it poorly. It is OK for a company to have more money. If the government can manage it uniformly, it will save our minds for printing and dyeing enterprises. "