Four quarters＇ water collecting and monitoring samples were done in the mining subsidence lakes of different water storing periods （ 2 to 7 years）, considering the water storing time and pollution sources state of ...Four quarters＇ water collecting and monitoring samples were done in the mining subsidence lakes of different water storing periods （ 2 to 7 years）, considering the water storing time and pollution sources state of the subsidence lakes. The following indexes were discussed such as organic indexes （TOC, CODM,, BOD, COD）, nutrient salts （TN, NH4^＋, NO3, NO,, Kjeldahl Nitrogen, TP, PO4^3- ）, etc. It is shown that water quality of the mining subsidence lake during the initial stage （ 2 years to 7 years） can stay relatively stable with a fluctuation during different quarters in a year, which can reach class Ill or IV of the Surthcc Water Environmental Quality Standard.展开更多
文摘Four quarters＇ water collecting and monitoring samples were done in the mining subsidence lakes of different water storing periods （ 2 to 7 years）, considering the water storing time and pollution sources state of the subsidence lakes. The following indexes were discussed such as organic indexes （TOC, CODM,, BOD, COD）, nutrient salts （TN, NH4^＋, NO3, NO,, Kjeldahl Nitrogen, TP, PO4^3- ）, etc. It is shown that water quality of the mining subsidence lake during the initial stage （ 2 years to 7 years） can stay relatively stable with a fluctuation during different quarters in a year, which can reach class Ill or IV of the Surthcc Water Environmental Quality Standard.
