Water quality assessment and analysis for rehabilitate and management of wetlands: a case study in Nanhai wetland of Baotou, China

School of Energy and Environment, Inner Mongolia University of Science &Technology, No.7 Arden Street, Baotou 014010, China

^* Innovation fund of Inner Mongolia University of Science & Technology (No.2015QDL16)

Abstract

Wetland plays an irreplaceable role in many aspects and waters are important part of wetland, the water quality can easily reflect the situation of Wetland. In this study, water quality was assessed on the basis of 5 parameters (DO, NH₄⁺-N, TN, TP and CODcr) that were monitored monthly at 5 sites (N₁,N₂,N₃,N₄ and N₅)from April, 2014 to March, 2015 of the Nanhai Lake in Baotou, China by water pollution index method and comprehensive water quality identification index method. The twelve monitoring months were divided into wet season (Mar., Aug. and Sep.), normal season (Jan., Feb., Apr., Nov. and Dec.) and dry season (May., Jun. and Jul.). The assessment results determined using the water pollution index method showed that the water quality of all the five monitoring sites were inferior Ⅴ, the main contamination was COD. The comprehensive water quality identification index showed that the water quality of the Nanhai Lake were classesⅤ, except for the N₂ in wet season and dry season, the N₁ in dry season and the N₅ in normal season, which were classes inferiorⅤ. All the five monitoring sites don’t achieving the desired water quality standard. According to the analysis, domestic discharge, industrial activities and developed recreation were major threats to water quality of Nanhai Lake.