Improving on-line water biological toxicity analyzer based on luminous bacteria

With the great increase of human industrial production and agricultural activity, the toxic effect of pollution source of water bodies is becoming more and more complicated, so the analysis of water biological toxicity has gradually become more necessary. Because of the inhibition of toxic material on the luminous intensity of the bacteria, this paper proposes an improvement of the internal structure and control methods of the on-line water biological toxicity analyzer based on luminous bacteria in the laboratory. The analyzer detects changes of luminous intensity of luminescent bacteria to analysis the biological toxicity of water quality caused by the heavy metals and other organic pollutants. The key improvements of the analyzer are as follows: Place a Hall switch on the sample container tray for the precise positioning of optical signal acquisition, to improve the accuracy of the test results. Install digital temperature sensors in the thermostat zone to acquire the environmental temperature, and send it to the microcontroller to maintain a constant temperature with the digital Proportion Integration Differentiation (PID) regulator. Control the rotation angle by the stepper motor to improve the accuracy of the material sending and the test results. The mixing blades of the activated reactor can be connected with the stirring motor through the long axis to improve the accuracy of the testing sample solution. By the measures above, this design achieves the goal of improving the reliability and the accuracy of the analyzer, and realizes rapidly, accurately and on-line detect and analyze to the biological toxicity of water.