Wastewater Treatment And Reuse In Xiaoshan Printing And Dyeing Industry To Achieve Energy Saving And Emission Reduction

Xiaoshan strictly restores water reuse in printing and dyeing chemical industry for printing and dyeing workshop

Environmental protection must be normalized so as to achieve the goal of protecting the environment.

Strict regulation of Xiaoshan

The industry will use the purified reclaimed water for printing and dyeing workshop to achieve energy saving and emission reduction, so that the improvement of the environment is very obvious. In the year of 2014, the air quality in Xiaoshan improved significantly.

Dyeing and chemical industry has always been a pillar industry in Xiaoshan. These high energy consumption and high pollution industries have created the rapid growth of GDP in Xiaoshan, but it has also made Xiaoshan suffer from environmental pollution, backward production capacity and overproduction.

Now, how to let these enterprises get out of the predicament of environment and benefit and seek for the development of higher quality, and also a blue sky in Xiaoshan, is no longer a bother to Xiaoshan people.

Daly (China) Limited (hereinafter referred to as Daly China) is a microcosm.

4000 tons of wastewater can be treated daily.

The water quality after deep purification is close to pure water.

Daly, China is a company engaged in silk weaving, knitwear, garment accessories production and garments export.

One-stop production enterprises, the current annual sales volume of 1 billion yuan.

From the factory gate to the production area, it takes four or five minutes to walk. Along the neat and clean road of the factory area, we can see the well-designed landscape ecology along the way - a semi enclosed factory area of Qingshui River, a large area of green lawn, and vibrant street trees, unlike factories, which are like parks.

In the most innermost area of the factory, there is a row of cement walls with a height of 4 meters. This is the waste water treatment system of Daly, China's expansion and pformation since 2013. It is said that it can dispose of 4000 tons of waste water every day.

Climbing up the wall, the reporter saw the whole picture.

It has been separated into rectangular sewage treatment ponds, from the first mixture of pungent odor, thick and thick wastewater, to the coarse crude settling tank, then to the anaerobic pond for total nitrogen, ammonia nitrogen and COD oxygen consumption tanks, two settling ponds, and abandoned ponds.

Through the biochemical reaction of 10 pools, the original wastewater has faded out and has no smell.

"The treated water has reached the national level.

Part of the sewage discharge standards can be directly discharged.

Daly, Secretary of the CPC Committee and deputy general manager of Yuan Baoer, said, "another part will enter the advanced treatment of the" reclaimed water reuse system ". After the filtration of quartz sand filter, ultrafiltration membrane and reverse osmosis membrane, the effluent index can meet the water quality standard of tap water.

Daly, director of environmental protection in China, Xie AI min simply picked up a glass of water and drank it directly. After drinking, he smiled and said, "now we can collect 2000 tons of recycled water every day.

Technically speaking, the water quality after these deep purification is almost the same as pure water.

According to the introduction, the purified "reclaimed water" (also known as reclaimed water and reclaimed water in Sewage Engineering) is more suitable for printing and dyeing production than tap water, and the produced water will be used for printing and dyeing workshop again.

Xie Aimin calculated a green account: "now the water supply is 2.3 yuan / ton, the sewage charge is 2.9 yuan / ton, and the running cost of the reclaimed water recycling system is 1.5 yuan / ton. According to the standard volume of 4000 tons / day, through waste water treatment and reclaimed water reuse project, we can reduce 480 thousand tons of waste water, 96 tons of COD and 43.2 tons of ammonia nitrogen every year, and save water by 480 thousand tons per year."

This directly brought Daly China's economic benefits of at least 2 million 474 thousand and 300 yuan.

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Hangzhou's printing and dyeing industry was approved in advance.

Upgrading regional acceptance

Xiaoshan district is expected to retain "Xiaoshan blue".

Daly, China is Xiaoshan district.

A microcosm.

According to the general idea of "eliminating and shutting down a batch, standardizing and upgrading a batch", since 2014, Xiaoshan district has invested more than 2 billion 500 million capital to promote the improvement of printing and dyeing and chemical industry, forming a good social, environmental and economic benefits.

After a year's hard work, Xiaoshan district has passed the improvement of the printing and dyeing chemical industry in the city ahead of schedule in the District of Hangzhou.

According to the reporter, as of now, the 63 printing and dyeing enterprises in the region, the planned closure of 13 enterprises have been shut down in place, the planned improvement of 50 enterprises have also been completed and improved; and the key chemical remediation of 88 enterprises, plans to close down 8 of them are all closed in place, 14 of the 80 households in the planned renovation have been shut down, the remaining 65 enterprises have been completed rectification and upgrading, and finally 1 enterprises will also complete the relocation work before the end of the year.

In addition, the Xiaoshan district has given itself a "job retention" - a total of 433 chemical enterprises involved in the production of chemical products in the whole region.

Such a great effort to improve the environment is very obvious. In 2014, the air quality API in Xiaoshan was 82.8%, and the AQI rate was 55.3%, up 5.8 percentage points and 6.5 percentage points respectively compared with the same period last year.

The average concentrations of PM10, sulfur dioxide, nitrogen dioxide and PM2.5 of the four main pollutants were 0.107mg/m3, 0.031 mg/m3, 0.051 mg/m3, and 0.064 mg/m3, respectively. Compared with the same period last year, they decreased by 6.1%, 13.9%, 5.6% and 13.5% respectively, and the air quality improved significantly.

The good momentum will continue to develop. Perhaps in the near future, "Xiaoshan blue" will become a new normal.

Daly's practice in China may serve as a standard culm of China's dyeing and chemical industry. It is worth learning, strictly regulating, recycling, and making full use of energy recycling. This will be a major trend in the future.