Influence of salinity on COD measurements in coastal water management

Abstract

A B S T R A C TChemical oxygen demand (COD) is an important parameter in water quality assessment. COD values by different determination methods were investigated in coastal rivers. The results show that there is no clear relationship between COD Cr and COD Mn in coastal areas. COD Cr does not reflect the degree of pollution of coastal waters. As salinity increased, COD Cr and acidic COD Mn increased significantly, but there was little/no change observed for alkaline COD Mn . Coastal zone water quality standards should be proposed to solve connection problems between marine quality standard and surface water quality standard.

Conversion mechanisms between organic sulfur and inorganic sulfur in surface sediments in coastal rivers

“…The GD is a municipal flood discharge river, and it flows into the North Yellow Sea with a total length of 8 km. The GD is an artificial urban river with high chemical oxygen demand (50 mg/L, Li et al, 2016), which is mainly affected by domestic sewage and few potential industrial effluents. To provide a water landscape, the riverbed of GD was constructed using concrete many years ago instead of natural sediments.…”

Feasibility assessment: application of ecological floating beds for polluted tidal river remediation

“…It is a typical seasonal river, with domestic and industrial wastewater discharge accounting for most of its water during the dry season (Sun et al 2016). The tide in the river estuary is a regular semidiurnal tide; therefore, the water quality is variable (Li et al 2016). At the beginning of the engineering experiment, a dam (~1.2-m tall) with a special floodgate (preventing flooding due to heavy rain) was built in the estuary to mitigate tidal effects and maintain a sufficient hydraulic retention time to remediate the heavily polluted river water.…”

Phosphorus release from coastal sediments: Impacts of the oxidation-reduction potential and sulfide

“…The river is a typical seasonal river, with domestic and industrial wastewater discharge accounting for most of the river water during the dry season . The tide in the river estuary is a regular semidiurnal tide, and therefore the water quality is variable (Li et al, 2016). Sediment samples were collected from the Yuniaohe River estuary using a Van-Veen grab sampler, and were stored in zip-lock plastic bags on ice in an adiabatic box.…”