To Lich River. From the factory waste water analysis it is found that, the main pollutants in
waste water in To Lich river Watershed (HABECO, Trang An JSC) are organic matter,nitrogen, TSS. The concentrations of nonbiodegradable compounds, phosphorus, iron and other heavy metals in waste water of the factories in downstream of To Lich river (Thuong Dinh industrial zone) are higher
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