Status of textile industry wastewater
Various industrial sectors in the country, wastewater emissions among the top five industries for thepaper industry, chemical industry, power industry, ferrous metal smelting industry and the textile industry, textile industry, which accounts for the country's industrial wastewater discharge waste water statistics amount of 7.5%, the total amount of wastewater discharge industrial fifth in the nation, totaled 1.413 billion tons annually, of which approximately 1.13 billion tons of dyeing wastewater (accounting for textile printing and dyeing industry wastewater by 80%), accounting for about industrial wastewater emissions by 6%, 300-400 million tons of emissions every day.
Most pollutants are biodegradable dye dyes, additives and toxic heavy metals, formaldehyde, halides, etc.. Emissions of 1 ton of printing and dyeing wastewater per can of 20 tons of water body pollution. Join the WTO, textile printing and dyeing are double-digit growth in recent years, but the pollution treatment facilities is difficult to synchronize, pollutant emissions to increase. Printing and dyeing wastewater treatment facilities across the country over 10 billion yuan of total investment.
China's industrial sector in the COD emission of the four key industries, textile printing and dyeing industry of COD emissions ranked fourth. Papermaking, food industry, the proportion of COD emissions decreased year by year, the textile and chemical industry, the proportion of COD emissions increased year by year, the proportion of textile printing and dyeing industry rose from 4.7% to 5.6%. Can be seen, the textile dyeing industry wastewater exist "big water, COD discharge is large, waste water treatment difficulties," and many other features.