High Efficiency, Low Energy Consumption, Zero Discharge, Textile Printing And Dyeing Wastewater Treatment, "Deep Well" Mode.

This is a special "deep well", fully sealed, 3.8 meters in diameter and 100 meters in depth, made of 20 mm thick steel plate with thumb width. This is also a magic "deep well". The waste water goes in and the water flows out, so that the textile printing and dyeing wastewater is truly efficient, low energy consumption and zero discharge. To create this "magic" is the national high-tech enterprise Kimberly Zhejiang Environmental Technology Co., Ltd.

Recently, China Textile Association and Guangdong Textile Engineering Society Held in Guangzhou Printing and dyeing wastewater reduction and energy saving new technology exchange meeting Above, this item "High efficiency, low energy consumption deep well aeration activated sludge process wastewater treatment technology" Attracted the attention of the scientific research institutions and textile printing and dyeing circles, and contacted with each other.

In November this year, the technology innovation project was received. Zhang Jie, academician of Chinese Academy of engineering, Wang Zhi, chief expert of China Textile Engineering Society, Professor Xi Danli of Donghua University Highly appraised by experts from other water environmental engineering or textile printing and dyeing experts, it is considered that the technology is effective in textile printing and dyeing wastewater treatment. It fully embodies the technical characteristics of deep well aeration, such as high oxygen utilization efficiency and high efficiency, stable operation, simple operation, low energy saving, low operation cost and almost no maintenance. It is innovative, reasonable and safe, and is at the international advanced level. It is suggested that it can be used as the first recommended technology operation and promotion catalogue for textile printing and dyeing wastewater treatment.

According to statistics, textile printing and dyeing wastewater has been occupying a large proportion in China's industrial sector. The annual wastewater discharge is about 2000000000 tons, accounting for 11% of the national wastewater discharge. With the strictness of the environmental protection policy, many printing and dyeing enterprises are facing the test of life and death. Textile printing and dyeing wastewater treatment has become the key to the sustainable development of the industry.

The profit of textile printing and dyeing enterprises can not be eaten by waste water treatment.

What kind of high technology has attracted the attention of this industry? according to Xie Jiahai, chairman of Zhejiang Kimberly Environmental Technology Co., Ltd. There are two main difficulties in the treatment of printing and dyeing wastewater. One is the high concentration and complex composition of organic matter in textile printing and dyeing wastewater. It is difficult to remove. It has to use a lengthy process route, which has large facilities and large construction costs. Two, in the treatment of textile printing and dyeing wastewater, the dosage of chemicals is large, energy consumption is large, the amount of sludge generated is high, and the operation cost is high. In the field of textile printing and dyeing wastewater treatment, biochemical method is the most widely used. The principle of biochemical method is to remove and adsorb organic matter in sewage by microorganism. It's like eating worms by eating the soil. However, in the aerobic process of biochemical treatment, under the condition of constant organic concentration, biochemical ability largely depends on the utilization rate of oxygen in wastewater, inefficient oxygen transfer utilization, larger biochemical oxygen treatment facilities and higher energy consumption. Biochemical activated sludge technology has many problems, such as low oxygen transfer efficiency, high operating cost, weak impact load, large area, large amount of sludge production, complex management, obvious influence by temperature changes, easy sludge expansion and high maintenance cost. Therefore, developing a high efficiency, low energy consumption textile printing and dyeing wastewater treatment technology has become a topic of concern in wastewater treatment. Deep well aeration technology has been developed and applied to meet the needs of wastewater treatment.

"The profit of textile printing and dyeing enterprises can not be eaten by waste water treatment". Since 2006, Zhejiang Kimberly Environmental Technology Co., Ltd. has carried out in-depth research on deep well aeration technology, innovated the aeration device and applied it in practice. After years of research and application practice, the deep well aeration technology has been innovated and improved. By improving the utilization rate of oxygen and reducing energy consumption, many problems existing in traditional aeration technology have been effectively solved.

What are the advantages of deep well aeration technology for textile printing and dyeing wastewater? 謝家海告訴記者，首先提高了氧轉移利用率：深曝井的深度大，井內(nèi)的高靜水壓力使得氧的傳質(zhì)推動力大，與常規(guī)曝氣技術氣泡和液體接觸時間15s相比，深曝井中的氣液接觸時間可達200s，故而大大提高了氧利用率；其次，深井曝氣技術由于傳氧效率高，且可以在井內(nèi)維持濃度高達10mg/L的 MLVSS，同時由于井內(nèi)的液體循環(huán)速度高、紊流度高，能使生物固體和有機質(zhì)間有效地混合傳質(zhì)，從而使得深井曝氣技術去除有機物的能力明顯強于普通曝氣技術；第三，運行成本低，深井曝氣技術處理廢水所需功率消耗比普通曝氣技術可降低50％以上，深井曝氣技術的污泥產(chǎn)生量是普通曝氣技術的1/2-1/3，不僅污泥消化池體積小，處置費用也低，后期也無需經(jīng)常進行維修保養(yǎng)；第四，占地面積小，深井曝氣處理廢水是在一個垂直的地下曝氣池中進行，可省去預沉池，污泥處置裝置體積 The area of aerobic biochemical section is 1/10 of the ordinary aeration tank. Fifth, the deep exposure well can withstand a higher impact load: as the concentration of the mixed liquid in the deep well is high and the oxygen saturation concentration is large, the organic matter in the waste water entering the deep well can be rapidly degraded by the microorganism; sixth, the deep well is generally built below the surface and has good insulation function. Even in the severe winter and deep exposure wells, the suitable temperature of the microorganism can be maintained, so that the treatment effect is not affected by the external temperature change, and the treatment effect is stable. Eighth, after the system is running, the microorganism will form a phospholipid membrane on the surface of the well wall, which can protect the outer cylinder from corrosion, and the theoretical life can reach 100 years.

Hundreds of enterprises taste the sweetness.

Kimberly's deep well aeration wastewater treatment technology has been actively responded to by the textile printing and dyeing industry: Jiangsu Shenghong group, dylin dyeing, Ming De textile, Longcheng textile printing, black peony printing and dyeing, Zhejiang Poseidon printing and dyeing, Beihai printing, Da he printing and dyeing, Huadu textile printing, new Australia shares, Fusheng dyeing and finishing, Jixiu dyeing and finishing, Sichuan cotton and Indonesian Kendall textile printing and dyeing. Hundreds of textile and dyeing enterprises at home and abroad cooperate with deep well aeration technology to deal with the wastewater, which greatly reduces the operation cost and treatment effect, and saves land.

Example: Suzhou Ming De Textile Co., Ltd. is a high-end textile fabric finishing processing business. The total daily wastewater generated is 7000 tons, and the discharge index of the NNP is 3750 tons / day before the transformation. According to the calculation of the discharge fee of 6.5 yuan / ton, the annual discharge cost is about 8 million yuan. The raw water COD is 1200-1500mg/L, and the original process adopts two level physicochemical treatment of air floatation + air floatation. The effluent COD is about 600-800mg/L, and the output of sludge is about 3 per thousand (about 21 tons / day).

After the project was rebuilt, a deep exposure well was added, the effluent COD dropped to 80mg/L, and the sludge output dropped to 1 per thousand (about 7 tons / day). The external displacement of the nanotubes is reduced by about 2000 tons, and the annual export cost is about 4 million 300 thousand yuan. The cost of the agent is 60% lower than that of the original (2.8 yuan / ton), and the annual cost is about 4 million yuan. Sludge production dropped to 7 tons / day, annual reduction of sludge disposal cost of about 2 million 100 thousand yuan.

Deep well aeration technology has made many textile printing and dyeing enterprises taste the sweetness, and they have found a new way to treat wastewater with low cost and high efficiency. For Kimberly, it has achieved double economic and social benefits through technological R & D investment.

In Xie Jiahai's view, Kimberly's innovation practice is opening up the green world, is accumulating "merit", Kimberly's technology can be recognized by the vast number of enterprises, that is, Kimberly shows the world with "Virtue". "Using technology to improve the environment is the way forward for Kimberly, and everything is clear water for that bay."