Sludges in textile, printing and dyeing can be divided into the organic one and the inorganic by their major components. Organic sludge, mainly of organic matter, also contains oil sediments and precipitated solid matter in waste water. Sludge is rich in organic matter, easy to rot and odor, and its small particles, often in the form of floc, are of high water content, strong water holding capacity and relatively low density.Inorganic sludge is also known as mud residue, and it is of high density, poor water retention, low water content, and good sludge stability, and it contains large particles and does not decay. In addition, dyes, slurries, additives in printing and dyeing sludge have nitro and amino compounds and heavy metal(copper, chromium, zinc, arsenic) have greater biological toxicity and are not environmentally friendly, posing awful pollution.
China’s National Hazmats List and China’s Solid Waste Guidelines stipulate: sludges textile, printing and dyeing cannot be defined as hazmats.Complex components kick printing and dyeing sludge into the category of general solid waste. There are certain environmental risks. Therefore, China’s Ministry of Environmental Protection's "Technical Guidelines for Viable Pollution Prevention and Control in the Textile Dyeing Industry (Trial)" stipulate that: textile, printing and dyeing sludge is likely to cause secondary pollution and its residue pollutes land, hence can’t be exposed to the wilderness or get land-filled without treatment.Therefore, textile printing and dyeing enterprises take pains to avoid secondary pollution by disposal of sludge.
In response to the above incidents, the energy-saving techs company, China ZJN specifically set up a technical research team, consulted a large amount of technical information, traveled throughout the country, collected dozens of sludge samples from textile, printing and dyeing enterprises, and finally designed a new type of rotary dryers.The company's “Rotary-harrow Material-crushing Triple-phase Multi-loop”dryers kill 100+ tons of high-humidity and high-viscosity sludge in textile printing and dyeing a day.The“boiler waste heat utilization” patent technology saves energy and reduces emission.So that our partners can tap out their full potentials and achieve greater corporate benefits!
