in 2013, taihua high-tech dyeing and finishing (jiaxing) co., ltd. invested more than 9 million yuan to expand and renovate the sewage pretreatment system, mainly to increase the capacity of the original biological pool, to build a new regulating tank, primary sedimentation tank, hydrolysis acidification tank and biological sedimentation. the pool retains the original conditioning pool and the primary sedimentation tank as the reused source pool and the final sinking tank after the transformation. after the expansion, the sewage treatment capacity reaches 10,000t/d, and it is treated by two-stage physicochemical and two-stage biochemical treatment process. the effluent quality meets the indirect emission limit of table 2 in the “textile dyeing and finishing industry water pollution emission standard”, and the reuse rate is ≥55%. . in 2018, with the expansion of production capacity, the company invested more than 20 million yuan to re-scale and expand the sewage treatment system, increasing the processing capacity of the original 10000t/d to 13500t/d, and the amount of recycled water to 9000t/ d, sludge production decreased from 40t / d to 20t / d.
investment: 9.6 million yuan
daily processing capacity of 15,000 tons
recovery rate ≥ 55%
reduce wastewater discharge
clean energy alternative project - steam replacement heat transfer oil
at present, the company has 7 setting machines. it was originally heated by two heat-conducting oil boilers. now all of them are converted into medium-temperature medium-pressure steam for heating. the steam is supplied by the company's own 35t/h circulating fluidized bed boiler. after the transformation, the operation is stable. the production efficiency has been significantly improved, the utilization of the entire energy ladder has been improved, and the energy utilization rate has increased by 28.3%. the company's two heat-conducting oil furnaces were also phased out at the end of december 2014. the energy-saving effect of the project is very obvious. it can save 1747 tons of standard coal, reduce 19.2 tons of sulfur dioxide and 15.2 tons of soot.
investment: 3 million yuan
energy efficiency increased by 28.3%
saving coal: 1788 tons / year
reduce co2 emissions: 19.5 tons / year
reduce nitrogen oxide emissions: 45.8 tons / year
reduce soot emissions: 15.2 tons / year
waste gas treatment
1. the processing technology for the fixed-type exhaust gas treatment facilities of the setting machine is that the shaped exhaust gas is collected and discharged into the “water spray two-stage high-voltage static electricity” purification device and discharged through a 15m high exhaust pipe. the collection rate is 98%, and the fume purification rate is reached. more than 90%, the removal rate of particulate matter reaches 80%; the emission concentration of pollutants such as fumes and particulate matter of the setting machine can reach the newly-built enterprise in table 1 of the “emission standard for air pollutants in textile dyeing and finishing industry” (db33/962-2015). emission limits, where fume ≤ 15 mg/m3 and particulate matter ≤ 15 mg/m3.
2. some fabrics after dyeing and finishing of the company need to be coated. exhaust gas is generated during coating and drying. the coating exhaust gas is collected and treated by five-stage water absorption activated carbon treatment equipment (dimethylformamide, toluene and the butanone removal rate is 95%), and the treated exhaust gas is discharged through a 15-meter high exhaust pipe. according to sgs standards technical service (shanghai) co., ltd. for the detection of coating exhaust gas, the organized emission concentrations of dimethylformamide, benzene series, vocs and other pollutants are <0.01mg/m3, 4.17mg/m3 respectively. and 0.258mg/m3, which are lower than the new enterprise emission limits in table 1 of the textile dyeing and finishing industry air pollutant emission standard (db33/962-2015).
3. in 2017, the company carried out low-nitrogen technology transformation on two boilers, mainly changing the boiler air distribution plate structure, secondary air vents, increasing water cooling screen, flue gas recycling, and furnace polymer out-of-stock equipment, etc. the original emission concentration of nitrogen oxides was reduced from 387 mg/m3 to 150 mg/m3.
4. our company collects and collects the polluting gas generated during the treatment of sewage in the dyeing and finishing sewage treatment deacidification tank, aerobic biological pool, sludge concentration tank and sludge filter press room. the collected pollutant gas passes chemical washing. the ammonia, hydrogen sulfide, volatile organic compounds, dust and other pollutants in the gas are dissolved, neutralized, oxidized, adsorbed and mixed with the fresh water after recirculation. gas dehydrates and enters uv
photocatalytic purification treatment, complete deodorization, sulfide <0.33kg/h
ammonia <4.9kg/h
odor concentration <2000
dimensionless, after reaching the discharge standard, it is discharged into the atmosphere through a 15-meter high-altitude cylinder.
energy comprehensive utilization technology reform project
the company's 6mw pumping steam turbine generator set was shut down in november 2017. due to the improvement of the company's production capacity, the company plans to use the energy comprehensive utilization technology reform project. it intends to use the existing boiler heat energy to drive the large air compressor by the impulsive steam turbine. the steam after the work is maintained to maintain the existing heat, and the pipe network is sent to each user. after the station is completed, it will replace 38 small electric compressors, saving 5,000 tons of standard coal annually, achieving the goal of saving energy, convenient operation and management, and stable and reliable gas supply.
steam instead of electric drag air compressor and air conditioning system
reduce co2 emissions: 8,000 tons / year
distributed rooftop photovoltaic project
on september 28, 2016, the company signed the “energy management contract for distributed photovoltaic power generation project” with jiaxing xinneng new energy co., ltd., investing rmb 43.45 million, and installed 5.43mw photovoltaic power generation roof on the roof of our new material factory. on july 18, 2017, the grid-connected power generation was successful. as of september 25, 2018, a total of 6.875 million kw was generated, saving 2,926.37 tons of standard coal and 7,104 tons of carbon dioxide.
investment: 98 million yuan
production capacity: 12000kwh
saving coal: 6000 tons / year
textile loom wastewater reuse
the company introduced foreign water-saving water jet loom, and at the same time established a sewage treatment system with a treatment capacity of 6000t/d to treat the production wastewater. 90% of the wastewater was recycled to the production after treatment, and 10% was included in the sewage pipeline network of jiaxing city. it reduces wastewater discharge and saves water consumption.
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