Four Typical Technologies For Dyeing And Printing Sludge In Jiangsu

< p > < strong > sludge reduction technology from the source "thin" < /strong > /p >

< p > sludge reduction technology, including sludge source reduction technology and deep sludge dewatering technology.

The technology of source reduction is to achieve absolute reduction of sludge by reducing sludge output. Deep dehydration technology reduces sludge relative reduction by reducing the amount of water produced in sludge.

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< p > Wuxi Zhongjia Polytron Technologies Inc is studying the technology of using composite bacteria to reduce the source of sludge. The principle is to add special microbial agents in the process of sewage treatment, optimize the composition and function of microorganisms in activated sludge, promote the decomposition of organic pollutants and constantly decompose the dead microorganisms, so that the absolute amount of sludge can be reduced by more than 50%, thus reducing the amount of excess sludge from the source.

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< p > Zhangjiagang Tong Qiao Sludge Treatment Technology Co., Ltd. has built a daily filtration and drying facility for dyeing and sludge conditioning at the tonqiao sewage treatment plant. The main process is < a href= "http://www.91se91.com/news/index_c.asp" > printing and dyeing sludge < /a > homogenizing, adding conditioners, filtering by special high pressure plate and frame filter press to about 40% moisture content, drying and sludge crushing and sending to the thermal power plant for incineration and disposal, and dewatering filtrate returning to the sewage treatment plant of Tong Qiao. The treatment cost of printing and dyeing sludge per ton of water content of 95% is only about 30 yuan per 100 tons.

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< p > Wuxi National Union Environmental Protection Energy Group Co., Ltd. is a deep dehydration project built at Wuxi Hui Lian garbage power plant, which can handle 200 tons of daily sludge with a moisture content of 80% per day.

In this process, the sludge with a moisture content of 80% is added to the water content of 90% after adding the compound inorganic salt flocculant.

Then the filter press was used for pressure filtration to reduce the moisture content of the sludge to less than 60%. The calorific value was about 450 calories per kilogram, which could meet the conditions of continuous combustion of sludge and refuse CO combustion.

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< p > < strong > sludge drying will change "waste" into "fertilizer" < /strong > /p >

< p > sludge drying technology can be divided into direct drying and indirect drying.

Direct drying is the direct drying of high temperature flue gas into the drier. This process is simple and has little heat exchange loss, but increases the polluting gas.

Indirect drying is the pfer of heat from high temperature flue gas to heat medium through heat exchanger, and then drying of sludge by thermal medium. There is a certain amount of heat loss in this way, but the amount of flue gas to be treated is small, and there will be no two pollution.

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< p > Suzhou Sino French Environmental Technology Co., Ltd. mainly deals with sludge produced in Suzhou's < a href= "http://www.91se91.com/news/" > Industrial Park < /a > industrial sewage treatment plant. The two stage indirect drying process is adopted to make sludge "waste" pformed into "fertilizer", and its processing capacity reaches 300 tons / day.

In the first stage, the sludge was dried in the thin evaporator to about 45% to 50%, and then the sludge granules were formed through the extruding equipment chopper. In the second stage, the moisture content of the sludge granules was 10% to 30% after drying by the two stage dryer of the belt dryer, and then sent to Suzhou's Dong Wu thermal power plant to mix with the coal as fuel.

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< p > the thermal drying facilities built by Changzhou new ring sludge treatment Co. Ltd. can handle 250 tons of printing and dyeing sludge with a moisture content of 83% per day.

This facility will pretreat the sludge through the two stage < a href= "http://www.91se91.com" > dryer > /a >, and use the fluidized bed furnace to produce two ~ 900 times of hot flue gas to dry the sludge for two times, and finally form the finished product with a moisture content of 20% to 30%, and a diameter of 1 cm right and left. The tail is < /p >.

< p > < strong > sludge mixed incineration technology makes sludge power generation < /strong > /p >

< p > mixed incineration technology for sludge is to use waste incineration plant, power plant and cement plant kiln to incinerate sludge. It is a kind of treatment technology that can realize harmless, decrement and reuse of sludge at the same time, but the sludge belonging to hazardous waste can not be mixed burning.

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< p > the sludge mixed incineration project of Hui Lian garbage power plant in Wuxi is a mixture of dewatered sludge and municipal solid waste with a moisture content of less than 60%.

After deep dewatering, the dry sludge was sent into a circulating fluidized bed incinerator for incineration through a modified coal handling system. The operation for more than two months showed that the performance of the boiler had not changed significantly and the discharge of flue gas was up to standard.

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< p > Changzhou ThermoElectron Corporation and Changzhou drainage management office have reformed 3 sets of 75 ton / hour circulating fluidized bed boilers in Changzhou Guangyuan Thermal Power Co., Ltd. and invested 12 million yuan to build sludge storage, pportation, combustion and control system. At present, 200 tons of sludge are processed daily.

After monitoring, dioxins and lead, cadmium, mercury and other heavy metals reached the emission limits of domestic waste incineration pollution control standards.

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< p > in addition, Nanjing Xiexin thermoelectric Co., Ltd. has adopted the same technology, basically solving the problem of sludge disposal in the river Xinzhou sewage treatment plant.

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< p > < strong > building materials utilization technology "swallowing mud" is only "golden brick" < /strong > /p >

< p > resource utilization makes sludge "gorgeous turn" into building materials, but in this process, more complex pretreatment is needed.

There are two kinds of pretreatment methods: one is to directly produce building materials after sludge dehydration and drying; the other is to make building materials after incineration of sludge, and can be used as cement < a href= "http://www.91se91.com/news/" > raw material < /a > brick making, ceramsite sintering and so on.

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< p > the daily processing of 300 tons of sludge brick making project developed by Changzhou Zhendong new energy saving building material factory has invested 40 million yuan, and it can handle sludge from domestic sewage treatment plants whose water content is about 80%.

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"P >" this project mainly uses sludge instead of clay, makes ingredients with fly ash, rice husk and other materials, produces sintering energy saving bricks, and uses the waste heat produced during the sintering of the brick kiln to dry the brick, making the production cost greatly reduced, the quality of the brick has reached the national standard, and has the advantages of light quality, heat insulation and heat insulation.

It is estimated that the sludge disposal cost of the plant is about 160 yuan / ton.

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