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Due to the production activities: at present a total of 134 industrial zone,export processing zone went into operation in our country there is only 1/3 of the industrial zone, theexport the waste water system. Many factories still using old technologies,industry discharged 500,000 m3 of wastewater per day not yet processed. The qualityindustrial waste water were exceeded several times the allowable limit. Especially the waterthe nhộm industry, food processing, tanning, chemicals withthe amount of contaminants is high, not processed wastewater directly into the drainage systemthe country has made heavy polluted water sources.
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