A method and device for measuring sediment denitrification rate

Abstract

The invention discloses a portable deposit denitrification rate (DNR) determination method and device. From NH4<+>-N participating in a coupled nitrification-denitrification effect (Dn) and NO3<->-N(Dw) participating in a non-coupled nitrification-denitrification effect, comparative analysis is carried out in combination with a deposit endogenous nitrogen behavior process; a component chemical equilibrium relation and a process metering relation are used for building a DNR analysis model; and based on this, existing in-situ ammonia nitrogen determinator and nitrate nitrogen determinator are subjected to system integration. A sensor is fixed in a proper position of bottom mud through a fixed shell and a telescopic rod, then data of ammonia nitrogen and nitrate nitrogen is collected througha transmitter, and the DNR is determined after PLC-based integrated analysis. The device is simple in structure, easy to detach, small in size and convenient to carry; and the pre-culture of a sampleis not involved, and the on-site in-situ determination can be directly carried out, so that the timeliness of determination is ensured and the actual denitrification performance of a site can be reflected more accurately.

Description

technical field [0001] The invention relates to the technical field of environmental detection, in particular to a method and a device for measuring the denitrification rate of sediments. Background technique [0002] Sediment is an important part of the water environment. It acts as a "sink" and "source" of pollutants. After effective control of exogenous pollution, the endogenous release of river and lake sediments will become the main cause of nitrogen pollution. The conversion behavior of endogenous nitrogen in sediments is a complex multiphase biogeochemical process involving chemical, biological, physical and other factors, among which denitrification is the key process of the biogeochemical cycle of nitrogen in sediments, and it is also the process of reducing nitrogen. An important pathway for loading and controlling the release of endogenous nitrogen. NO required for sediment denitrification 3 - There are two sources: one is NO from the diffusion of overlying wat...

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Problems solved by technology

[0004] So far, the methods for determining the denitrification rate of sediments at home and abroad, including the relatively widely used acetylene inhibition method, are basically based on the determination of the denitrification rate after simulated cultivation in the laboratory, and the on-site environment such as substrate levels and gradients. There are certain differences in the distribution of anoxic microenvironment and hydrodynamic conditions, which often lead to the possibility of overestimating or underestimating the denitrification rate.

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