Raindrop triggering type runoff automatic sampling device and method

Abstract

The invention relates to raindrop triggering type runoff automatic sampling device and a method, which can be used for carrying out regular-time automatic monitoring on storm runoffs in the environment monitoring field or the water and soil conservation field. According to the sampling device, the whole sampling device is controlled to be started through a raindrop triggering device; when rainfall reaches a set value, a PLC (Programmable Logic Controller) can start a step motor, a water pump and a peristaltic pump in sequence according to steps and time intervals which are set in advance, so as to collect runoff water samples in different periods and point locations and assign to corresponding sample bottles for storage. By being arranged near a riverway for sampling in advance, the raindrop triggering type runoff automatic sampling device can automatically collect the runoff water samples in an unattended operation during rainstorm, so that the outdoor sampling difficulty of rainstorm runoffs is greatly reduced, and the labor intensity of the sampling staff is reduced. Furthermore, the raindrop triggering type runoff automatic sampling device further has the advantages of high sampling reliability, low production cost and compact structure.

Description

technical field [0001] The invention relates to a water sample collector, in particular to a rainfall-triggered runoff automatic sampler and a method thereof. Background technique [0002] Pollutant loss from storm runoff is one of the important factors of non-point source pollution, but the sampling work of storm runoff generally needs to be carried out in the field, and the sampling conditions are relatively difficult. The uncertainty of rainfall has led to the inability to make sufficient preparations for the sampling work, and the sampling personnel cannot rush to the sampling site in a short time. Although long-term spot sampling can effectively monitor storm runoff, it requires a lot of manpower and material resources; Periods, especially during rainstorms, are often accompanied by severe weather such as strong winds and lightning, and the safety of sampling personnel cannot be guaranteed during manual sampling. [0003] At present, some patents have tried storm runof...

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Problems solved by technology

[0007] Device" (Application No. 201310220616.5, Publication No. 103335868A), the core of which is composed of a rain gauge, a single-chip microcomputer, a solenoid valve, and a submersible pump. Through the intelligent control of the single-chip microcomputer, the automatic collection of rainwater or runoff water can be realized, but the same as the above example As mentioned, its space utilization rate is also low

What's more serious is that according to environmental monitoring standards, when the width and depth of the river channel are greater than a certain value, the method of multi-point sampling and mixing should be adopted, and if there are residual samples in the sampler or sampling bottle during water sample collection, the target water sample should be used After the sample is collected, preservative should be added immediately to prevent the metabolic activity of microorganisms from affecting the concentration of pollutants in the sample. However, the above two patents and most similar sampling devices do not have this function. Therefore, in actual monitoring, The accuracy and reliability of samples obtained with such devices is greatly reduced

[0008] In addition, with the advancement of environmental protection technology, many highly automated instruments have been finished products, but their cost is expensive, and the cost is too high for ordinary monitoring. Therefore, it is necessary to develop a device suitable for automatic sampling of storm runoff in the field. Must do

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