CN-116794131-B - BOD real-time on-line monitoring device

CN116794131BCN 116794131 BCN116794131 BCN 116794131BCN-116794131-B

Abstract

The invention discloses a BOD real-time on-line monitoring device, which relates to the technical field of water quality monitoring and comprises two monitoring units, wherein each monitoring unit comprises a water inlet pump, a bioreactor and a drainage pump which are sequentially connected through pipelines, the bioreactor is a microbial electrolytic cell, the bioreactor comprises a closed shell, a cylindrical cathode and an anode which penetrates through the cathode are arranged in the shell, an electroactive biomembrane grows on the anode, the water inlet pump is communicated with a water inlet on the shell, the drainage pump is communicated with a drainage outlet on the shell, a data acquisition module, the cathode and the anode are respectively and electrically connected with the data acquisition module, a data processing module is electrically connected with the data acquisition module, a display screen is electrically connected with the data processing module, and a power supply is used for supplying power to the cathode, the anode, the data acquisition module and the display screen. The invention realizes real-time online monitoring of BOD.

Inventors

WANG XIN
LIAO CHENGMEI
WANG ZIYUAN
LI NAN

Assignees

南开大学

Dates

Publication Date: 20260512
Application Date: 20230626

Claims (3)

1. A BOD real-time on-line monitoring device, comprising: The system comprises two monitoring units, wherein each monitoring unit comprises a water inlet pump, a bioreactor and a drainage pump which are sequentially connected through pipelines, the bioreactor is a microbial electrolytic cell, the bioreactor comprises a closed shell, a cylindrical cathode and an anode which penetrates through the cathode are arranged in the shell, and an electroactive biological film grows on the anode; the data acquisition module is electrically connected with the cathode and the anode respectively and is used for acquiring current generated on the anode; The data processing module is electrically connected with the data acquisition module and is used for automatically calculating the BOD of the water sample in the bioreactor according to the current; The display screen is electrically connected with the data processing module and is used for displaying the BOD; the power supply is used for supplying power to the cathode, the anode, the data acquisition module and the display screen; The automatic control system comprises a PLC programmable controller, and all the water inlet pumps and all the water discharge pumps are respectively and electrically connected with the PLC programmable controller; The device comprises a box body, wherein a horizontal partition plate is arranged in the middle of the box body, and the space in the box body is divided into an upper box body and a lower box body by the partition plate; the bioreactor is arranged in the lower box body, the water inlet pump, the drainage pump, the data acquisition module, the display screen and the power supply are arranged in the upper box body, a heat insulation shell and a heating plate are sequentially stuck on the inner wall of the lower box body, and a cooling fan and a temperature sensor are arranged in the lower box body; The method comprises the steps of continuously flowing water samples in and out of one bioreactor, namely a continuous flow reactor, periodically updating water samples in the other bioreactor, namely an intermittent flow reactor, calculating to obtain an accurate BOD value as a calibration curve by the data processing module according to the current time integral calculation in the update period of the intermittent flow reactor, and calculating to obtain the real-time BOD value of the continuous flow reactor by the data processing module according to the continuously collected real-time current value of the continuous flow reactor by utilizing the calibration curve.
2. The BOD real-time online monitoring device of claim 1, wherein the cathode is a titanium-based cathode and the anode is a carbon fiber brush anode.
3. The BOD real-time on-line monitoring device of claim 1, wherein each water inlet pump and each drain pump are further provided with a manual switch, and each manual switch is electrically connected with the PLC.

Description

BOD real-time on-line monitoring device Technical Field The invention relates to the technical field of water quality monitoring, in particular to a BOD real-time on-line monitoring device. Background The instant and accurate acquisition of key pollution indexes in the water body is necessary whether the system stands in the angle of enhancing supervision and reducing regional carbon emission or in the angle of upgrading the process and realizing wastewater reclamation. The biochemical oxygen demand (Biochemical Oxygen Demand, BOD) refers to the level of organic matters in the water body which can be utilized by microorganisms, and can be used for intuitively reflecting the carbon emission and simultaneously reflecting the potential of sewage recycling to a great extent. BOD is also one of the important process parameters affecting the treatment effect for processes such as nitrification and denitrification in sewage treatment. However, the traditional BOD test method needs to dilute and inoculate the collected water sample, and then the obtained diluted inoculation liquid is subjected to organic microbial degradation for at least five days, and the dissolved oxygen difference value before and after biodegradation of the test liquid is obtained by matching with an oxygen dissolving meter, a pressure difference meter, a spectrometer and other instruments, so that the BOD value is finally converted, and the whole test process is long in time consumption, complex in monitoring system, large in occupied area, greatly influenced by operators and operating conditions in the measuring process, and cannot realize process control in wastewater treatment and in-situ real-time on-line monitoring requirements of water environment. Disclosure of Invention The invention aims to provide a real-time on-line BOD monitoring device, which solves the problems in the prior art and realizes real-time on-line BOD monitoring. In order to achieve the above object, the present invention provides the following solutions: the invention provides a BOD real-time on-line monitoring device, which comprises: The system comprises two monitoring units, wherein each monitoring unit comprises a water inlet pump, a bioreactor and a drainage pump which are sequentially connected through pipelines, the bioreactor is a microbial electrolytic cell, the bioreactor comprises a closed shell, a cylindrical cathode and an anode which penetrates through the cathode are arranged in the shell, and an electroactive biological film grows on the anode; the data acquisition module is electrically connected with the cathode and the anode respectively and is used for acquiring current generated on the anode; The data processing module is electrically connected with the data acquisition module and is used for automatically calculating the BOD of the water sample in the bioreactor according to the current; The display screen is electrically connected with the data processing module and is used for displaying the BOD; and the power supply is used for supplying power to the cathode, the anode, the data acquisition module and the display screen. Preferably, the automatic control system further comprises a PLC programmable controller, and all the water inlet pumps and all the water discharge pumps are respectively and electrically connected with the PLC programmable controller. Preferably, the device further comprises a box body, wherein a horizontal partition plate is arranged in the middle of the box body, and the space in the box body is divided into an upper box body and a lower box body by the partition plate; the bioreactor is arranged in the lower box body, and the water inlet pump, the drainage pump, the data acquisition module, the display screen and the power supply are arranged in the upper box body. Preferably, a heat-insulating shell and a heating plate are sequentially attached to the inner wall of the lower box body, a cooling fan and a temperature sensor are arranged in the lower box body, and the heating plate, the cooling fan and the temperature sensor are respectively and electrically connected with the PLC. Preferably, the cathode is a titanium-based cathode, and the anode is a carbon fiber brush anode. Preferably, the box body is further provided with manual switches of each water inlet pump and each drainage pump, and each manual switch is electrically connected with the PLC. Compared with the prior art, the invention has the following technical effects: The BOD real-time online monitoring device provided by the invention realizes real-time online monitoring of the BOD. Drawings In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to th