Dyeing and printing industry pollution control problem is a long-lasting battle. In 2011 years, sewage treatment is not fix, and emitted printing and dyeing sludge events.
According to the southern daily reports, a few days ago, a district, foshan city, guangdong province, city streets Hollywood dujiang village village was dumped more than 60000 tons a case has set up a file GaoPo printing and dyeing sludge. Five suspects for suspected crimes by the environmental pollution by the approval of a people's procuratorate arrested area. This is the new criminal law "pollution environment of sin" in the region for the first time, knocked on the national power control environmental pollution alarms.
There will be a printing and dyeing wastewater. At present the sewage treatment method for many, the effect is more apparent. But the management of sludge sewage treatment than more complex and difficult management bigger also. The sludge by events, let dyeing and printing industry take up again the nerve.
Our country dyeing and printing industry to produce a year how many sludge, there is no accurate statistics. According to estimation about millions of tons. So many of the sludge, suddenly get rid of has difficulties: one is the sludge treatment than sewage difficulties; 2 it is the sludge treatment into big, technical problems. Last year, China's environmental high technology association held in Beijing "national dyeing and printing industry wastewater treatment and sludge disposal technology conference, mainly discussed the improve dyeing and printing industry wastewater treatment level, reduce water consumption and reduce water drainage, strengthen the printing and dyeing wastewater recycling and sewage reuse, depth processing, sludge disposal topics such as the technology. The expert thinks, at present, our country sludge management goal is implementation reduction, stabilization and harmless. That is at present can not do it sludge harmless cases, should actively looking for less sludge produce methods, and achieve its research recycling effective way, become for good.
Some of the successful experience of the enterprise is worth using for reference. The reporter understands, zhejiang true love carpet industry science and technology Co., LTD, the use of advanced "deep well aeration" technology and equipment, achieve the goal of sludge in half. The company in the production of raschel blankets as its main business, according to the traditional process, the blanket in printing, printing and dyeing process needing lime, acid and ammonium chemical raw materials, etc, these chemical raw materials into sludge precipitation, is caused extremely easily secondary pollution. The company and the Shanghai institute of environmental cooperation, in 2010 investment more than 800 yuan, successfully developed the domestic leading deep well aeration process. According to information, this technology introducing advanced Japanese wastewater treatment process, cover an area of an area small, YunHangFei low, produce less sludge characteristics, the deal directly with high concentrations of wastewater, and not affected by temperature change and other effects. Compared with ordinary aeration method, deep well aeration process reduced sludge nearly half, a ton of waste water treatment costs lower than the original 1.2 yuan, considerable economic benefit. Deep well aeration (namely the deep water aeration) technology is mainly by biological treatment, physical and chemical processing, supplemented by technology, in the ground as deep well aeration, active sludge treatment. Aeration down tube and tube by the rise of waste water and sludge down into the tube, in circulation in well, air into the down tube, the mixture is rising by the tube to solid-liquid separation device. This process the biggest characteristics is a large depth aeration, dissolved oxygen concentration is high, the oxidation ability is extremely strong, can quickly and efficiently wastewater to oxidative decomposition of organic matter into CO2 and H2O and other inorganic, become harmful for harmless. In addition, the sludge part can be through the return sludge pump back into the deep well, excess sludge into sludge concentration pool, after dehydration concentrate to the next cycle processing, such as manufacturing industry cement and other building materials.
According to the report, Chinese building materials group affiliated hangzhou nanfang cement Co., LTD. Is a wholly owned subsidiary shaoxing southern cement Co., LTD. Success last year explore sludge preparation ecological cement new topic. In the first half of 2011, the company is using a new dry method production line is "eat" printing and dyeing enterprise emissions near sludge more than 9000 tons, be in shaoxing energy conservation, emissions reduction and the development of recycle economy of new luminescent spot. According to information, ecological cement technology is preparation sludge will be wet the sludge and limestone in proportion to mixing raw homogenization, through high heat forging to burn, make clinker of alkaline sludge gas and the acid in effective "and", fully eliminate the heavy metals in the sludge elements of harmful substances. The sludge can be substituted for the part of inorganic composition of raw material, at the same time, the sludge in forging and clinker calorific value to obtain the effective use of, so reduce the corresponding coal consumption, achieve the effect of energy saving and emission reduction, is fully staffed.
"1025" period, energy conservation and emission reduction as an important basic state policies, and was referred to a higher level. In our country's printing and dyeing enterprise is relatively concentrated area, will be more strict sewage discharge standard. The reporter understands, recently, there have been many provinces on printing and dyeing enterprise emission local standards, further improve printing and dyeing enterprise sewage discharge threshold. Such as fujian enacted textile dyeing industrial water pollution discharge standards "with respect to the regulation, to June 1, 2013 before, printing and dyeing enterprise water pollutants in the limit, COD (chemical oxygen consumption) for 100 mg/L, to reach 50 after mg/L, other index will drop 50%. Shaoxing county on emissions substandard YinRanYe all take a TaoTaiZhi. Local relevant departments according to every 10 days of sewage into tube COD concentration average ranking, into the pipe of the highest concentration sewage not done enterprise will be shut. At present, the printing and dyeing industries in average profit margin has also is textile industry in one of the lowest industry, facing the equipment modification and environmental management of pressure also is the largest. Survival for them is a "life and death speed" test. In "dangerous wall" under the dyeing and printing industry in our country, but to actively respond to environmental pressure and improve their performance level of science and technology, specimen and cure, paid attention both to the sewage treatment, and the use of sludge reduction, ambition, it will be possible to realize the sustainable development.
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The Chinese people's political consultative conference offer local intensify industrial dangerous waste treatment strength
January 10,, the Chinese people's political consultative conference LiJingMing foshan city in guangdong province in 1642, titled "about intensify industrial dangerous waste treatment strength proposal" in the bill reflects said. In 2011, the good occurred many times the illegal dumping of industrial dangerous waste events, such as the Dutch west industrial areas of rich avenue, a vast wasteland is piled high with deep black sludge. And as a cult village in grave found a illegal sludge (preliminary appraisal for ceramics waste residues) dump point, the point is located in the mountains, landfill edge also built the volumetric, obviously is organized in a planned way, the dumping of behavior. According to concerning sectional preliminary judgment, the sludge can be poisonous
In the proposal LiJingMing points out, in the brillant appear this kind of circumstance, on the one hand, and a relevant industrial development itself, on the other hand also and related departments of the relevant regulation is slack. He suggested that should according to the prevention and control of environmental pollution by solid waste of guangdong province regulations to increase industrial dangerous waste processing power. Lose out, looking for comprehensive prevention and control measures, and carry out involving industrial dangerous waste discharge enterprise and the surrounding the hidden trouble of the regional environment regularly, weaving, foshan city, industrial dangerous waste pollution comprehensive prevention and control plan. In addition to suggest that enterprise came near to deal with waste, reduce the management cost, LiJingMing also presented in the proposal in in foshan city, in support of potential enterprise, especially the private enterprise, so it can reach the corresponding qualifications, can obtain environmental protection from the department of business licenses to deal with industrial waste.
At the same time, LuoBinHua committee also mentioned in the proposal, foshan city, sludge treatment ability is not exist great gap, can not be the sludge disposal of the exurb sent to landfill, dumping or halfway dumping, become secondary pollution sources of related problems.
Source "the Chinese textile nets"
Editorial: Crysta