Novel BOD (biochemical oxygen demand) determination system for continuous microorganism oxygen supply

Abstract

The invention relates to an apparatus for environmental science research, in particular to a novel BOD (biochemical oxygen demand) determination system for continuous microorganism oxygen supply. The novel BOD determination system comprises a continuous oxygen supply unit, a measuring unit, a constant-temperature culture device, a magnetic stirring device and a software recording module for controlling the whole system. An operating principle of the novel BOD determination system includes that microorganisms are biodegraded in a reaction vessel under the normal pressure and at the constant temperature to consume oxygen to produce carbon dioxide, the carbon dioxide is absorbed by carbon dioxide absorbents on the upper portion of the reaction vessel, pressure in the reaction vessel is reduced so as to generate a pressure difference, a circuit in a U-shaped tube is connected to promote a constant-current power supply module to be turned on, a copper sulphate solution in an electrolysis vessel is subjected to electrolysis to produce oxygen, and a coulometer module starts to record electrolysis electric charge quantity; the oxygen is supplemented into the reaction vessel to enable the pressure difference of a U-shaped tube pressure meter to vanish, the circuit is disconnected, the constant-current power supply module is turned off, the electrolysis vessel stops electrolysis, and the coulometer module stops recording; the software recording module is controlled to process experimental data. The novel BOD determination system for continuous microorganism oxygen supply is capable of providing continuous oxygen supply and achieving precise temperature control.

Description

technical field [0001] The invention relates to an instrument for environmental science research, in particular to a novel microorganism continuous oxygen supply BOD measurement system which can provide continuous oxygen supply and precise temperature control. The system can be used for continuous oxygen supply to detect the biochemical oxygen demand of various chemical substances; for biodegradability research, suitable for inherent biodegradation test, rapid biodegradation test, simulated biodegradation and other experiments. technical background [0002] Biodegradation refers to the destruction or mineralization of natural and synthetic organic matter by aerobic microorganisms. It is done through the respiration of microorganisms. Microbial respiration includes: aerobic respiration and anaerobic respiration. Biochemical Oxygen Demand (BOD) is defined as the amount of free oxygen consumed by aerobic microorganisms to oxidize and decompose organic matter per unit volume o...

AI Technical Summary

Problems solved by technology

At present, the biodegradability analysis instruments produced in my country do not have a continuous oxygen supply system, constant temperature culture conditions, and low detection flux. They mainly measure BOD5 in water and wastewater, and do not target chemicals with high toxicity, persistence, and high accumulation. Instruments for Inherent Biodegradability Analysis

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