The invention discloses a test method for evaluating grit chamber degritting effect in a sewage pretreatment phase, which comprises the following steps: firstly taking raw water samples continuously at a turbulent flow zone of a grit chamber inlet channel, and performing sedimentation; uniformly adding a certain amount of mixed grit with a particle size grade matching the grit particle size grade in the raw water into a water inlet of the grit chamber, continuously taking samples at an outflow turbulent flow zone of the grit chamber, performing sedimentation of the water samples in a sedimentation device; rinsing, drying, and weighing the mud grit mixture collected in the sedimentation device to obtain the grit content of the inflow and outflow water of the grit chamber, calculating the grit chamber degritting rate by the ratio of the difference between the total grit amounts of the inflow and outflow water of the grit chamber at the sampling time to the total grit amount of the inflow water so as to evaluate the degritting effect of the grit chamber. The invention is simple and rapid in engineering application, stable and accurate in test data, and suitable for performance testing of degritting effect of different types of grit chambers.

Test method for evaluating grit chamber degritting effect in sewage pretreatment phase

The invention discloses a silt washing starting measuring system capable of being synchronously applied to a laboratory and a tidal flat site. The silt washing starting measuring system comprises a control end and a measuring end which are connected. The measuring end comprises a reactor which is of a cylindrical structure, a profile current meter, a turbidity sensor and a transmission device, wherein the profile current meter, the turbidity sensor and the transmission device are located in the reactor. The profile current meter and the turbidity sensor are connected with the control end respectively, the transmission device comprises a motor, a connecting column and a rotating paddle, and the motor is in transmission connected with the rotating paddle through the connecting column; a cover plate is arranged at the top of the reactor, and the motor is fixed on the cover plate; an isolation groove is formed in the center of the bottom of the reactor, a groove cover connected with the isolation groove in a matched mode is arranged at the top of the isolation groove, a water inlet valve and a water outlet valve are arranged on the side wall of the reactor respectively, and the bottom of the reactor is connected with a bottom plate or annular lengthened supporting plates. The silt washing starting measuring system can be synchronously applied to silt washing starting measuring testing of the laboratory and the tidal flat site.

Silt washing starting measuring system capable of being synchronously applied to laboratory and tidal flat site

The invention discloses a system for detecting the content of sand in Yellow River by adopting an audio frequency resonance principle. An audio frequency resonator is composed of an audio frequency resonance left arm and an audio frequency resonance right arm, wherein the audio frequency resonance left arm and the audio frequency resonance right arm are respectively connected with a resonance exciter of the audio frequency resonator, the resonance exciter of the audio frequency resonator is connected with a resonance frequency signal detector of the audio frequency resonator, a temperature sensor and a pressure sensor are adhered on an extendable shaft; the extendable shaft is connected with a clamped body spiral wire by virtue of a plastic anti-vibration sleeve, the clamped body spiral wire is mounted on a protection round box of an audio frequency resonance sensor hardware circuit, an information processing and sending circuit module is arranged in the protection round box, and the resonance frequency signal detector of the audio frequency resonator is connected with the information processing and sending circuit module through a circuit. The system has the beneficial effects of good stability, high precision and strong interference resisting capability.

System for detecting content of sand in Yellow River by adopting audio frequency resonance principle

The invention provides a large-size movable suspended matter section high-resolution measurement and slidable sampling device. The large-size movable suspended matter section high-resolution measurement and slidable sampling device comprises a barrel body, a movable platform frame, an electric stirrer, a motor, an optical backscatter turbidimeter, a first ASM optical measurement device and a second ASM optical measurement device, wherein the barrel body, the electric stirrer and the motor are arranged on the movable platform frame; the barrel body is used for storing a sample to be detected; the motor drives the electric stirrer to rotate; the electric stirrer is arranged at the bottom end of the barrel body; an OBS (Optical Burst Switching) probe of the optical backscatter turbidimeter is arranged in the barrel body; optical sensor matrixes of the first ASM optical measurement device and the second ASM optical measurement device are arranged in the barrel body; and the measurement range of the first ASM optical measurement device is greater than that of the second ASM optical measurement device. The large-size movable suspended matter section high-resolution measurement and slidable sampling device has high resolution and can be used for observing a real-time dynamic process, and the measurement of a time-space continuous concentration value is finished; and meanwhile, the large-size movable suspended matter section high-resolution measurement and slidable sampling device also can be used for carrying out real-time monitoring of the salinity, temperature and turbidity of specific positions.

Large-size movable suspended matter section high-resolution measurement and slidable sampling device

The invention provides an experiment method for measuring drag coefficient of irregular particles. Irregular settlement particles, a settlement vessel, an optical shooting system, a physical propertymeasurement system and the like which are spliced in a decentration mode are mainly included. Non-uniform particles are spliced by two materials with different density. The volume ratio of the two materials is adjusted, and therefore the attitude angle of the particles are maintained to be fixed under the action of eccentric moment in the settlement experiment. A high-speed camera is adopted to record the process of free settlement of the non-uniform particles released in a solution medium with different viscosity. The settlement velocity and trajectory of the non-uniform particles are analyzed by a corresponding algorithm, and the drag coefficient of the irregular particles at the specific attitude angle is obtained. The method can be used commonly, is effective and is easy to operate, and is suitable for drag coefficient measuring of particles with different irregular shapes at the specific attitude angle.

Settlement experiment method for measuring drag coefficient of irregular particlesat specific attitude angle

The invention discloses a large-size temperature-controllable automatic stirring sedimentation compaction test device, which comprises a sedimentation cylinder. The large-size temperature-controllable automatic stirring sedimentation compaction test device is characterized in that a water inlet pipe and a water outlet pipe are arranged at the bottom part of the sedimentation cylinder; the bottom part of the sedimentation cylinder is further provided with an air inlet valve used for air inlet stirring in the cylinder; the bottom part in the sedimentation cylinder is provided with an air inlet pressing plate used for stirring a water body; and heating equipment is also arranged in the sedimentation cylinder. Compared with the traditional sedimentation cylinder, the sedimentation cylinder developed by the invention can be used for carrying out both sedimentation process tests and silt compaction process tests, can measure the continuous concentration value along a vertical line, and is convenient to operate. In addition, water temperature, salinity, water depth, initial sand content and other parameters can be adjusted conveniently.

Large-size temperature-controllable automatic stirring sedimentation compaction test device and test method thereof

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Large-size temperature-controllable automatic stirring sedimentation compaction test device and test method thereof