QCVN 14:2008-BTNMT Facebook twitter google linkedin National technical regulation on domestic wastewater QCVN-14-2008-BTNMT.pdf related article QCVN 01-MT:2015-BTNMT QCVN 11-MT:2015-BTNMT (Replace QCVN 11:2008-BTNMT) QCVN 12-MT:2015-BTNMT (Replace QCVN 12:2008-BTNMT)