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1 experimental procedure

1.1 In the experiment, the hydraulic characteristics of the filter equipment are determined primarily by measuring the pressure difference, flow rate, volume of filter material and particle size of filter material.

1.2 Pressure Difference Measurement

1.2.1 pressure difference measurement can reflect the pollution degree of the bed of filter material deionization water treatment equipment. The function of filter backwashing operation can generally be determined by measuring the pressure drop of the filter bed before and after backwashing.

1.2.2 Pressure differential measurement uses the measuring equipment listed in Chapter 6 coating water treatment equipment.

1.3 Flow Measurement

The measurement of 1.3.1 flow rate can determine the output of the equipment, and can also be used to determine the fluid flow rate of backwashing, positive glass tank membrane cleaning water equipment and filter components.

1.3.2 Flow measurement uses the measuring equipment listed in Chapter 6.

1.4 Temperature measurement is to ensure the operation of the filter under the planned operating conditions. The method and appearance of temperature measurement are in accordance with the rules of Regulation 6.

1.5 Measurement of Layer Height during Filtration

1.5.1 The measurement of the filter material layer height is used to recognize the filter material layer height of various specifications in the filter equipment.

1.5.2 When measuring the volume of filter material, the volume of container head and the volume of internal distributor should be taken into account.

1.6 The measurement of the size of the filter material when it is loaded is used to determine whether the size of the filter material satisfies the requirements of the equipment planning.

1.7 Chemical measurement is primarily used to determine the filtering function of filtration equipment.

1.8 The quality of water entering the filter must conform to the rules of jb/z360.

2 Items requiring chemical measurements in functional experiments of filtration equipment

2.1 Measurement of suspended solids in mechanical filter samples

2.2 Measurement of Oxygen Consumption, Oxygen Consumption, Chlorine Residual Chlorine in Inlet and Outlet of Activated Carbon Filter Samples

3. Measuring methods

3.1 Pressure Difference Measurement

3.1.1 Pressure drop of filter equipment or system is usually measured by pressure gauge and differential gauge of the device along the way.

3.1.2 The pressure loss value of a single equipment or system can be measured by a differential pressure gauge or a pair of matching calibrated pressure gauges. If a pair of pressure gauges are used, the two gauges should be installed at the same height to prevent the correction of different static pressure heads, and to facilitate reading out the inlet and outlet pressures together.

3.1.3 It is necessary to select the range of pressure gauge appropriately. The maximum range of pressure gauge should usually be 1.5-2 times of the indicated uniform value.

3.1.4 Because the flow rate affects the pressure difference, it is necessary to agree that one flow rate is still several flows before the experiment.

3.1.5 It is necessary to place pressure measurement points on the inlet and outlet pipes of the filter vessel in the resistance loss experiment of the equipment.

3.2 Flow Measurement

3.2.1 is to determine the backwashing flow, cleaning and running flow of the filter equipment. It can be used to measure the flow by installing a flowmeter on the inlet pipeline of the filter equipment.

3.2.2 In a small filtration system, if no flowmeter is installed, the flow can be imported from the outlet of the filtration equipment into a container agreed by all the participants in the experiment, which measures both mass and volume, to determine the flow rate.

3.3 The liquid-filled glass thermometer can be used for temperature measurement.

3.4 Measuring the height of filter material layer, measuring the quality of filter material loaded and the height of stacking density accounting layer.

3.5 MEASUREMENT OF FILTER PARTICLE SIZE

The measurement of 3.5.1 particle size includes the measurement of particle size and coefficient of inhomogeneity, which can be measured by screening analysis.

3.5.2 particle size is indicated by the following two methods:

A. Uniform particle size D50 - sieve pore size (usually indicated in mm) through which 50% (by weight) of filter material can pass

B. Useful particle size D10 - the sieve aperture through which 10% (by weight) of the filter material passes (usually indicated in mm)

3.5.3 Non-uniformity coefficient KB is calculated according to the following formula:

KB = D80 / D10 type: D80 - 80% (by weight) filter material can pass through the sieve aperture (usually indicated in mm).

3.6 The collection of water samples and the determination of various chemical items for chemical measurement in and out of filter equipment are carried out according to gb6903-6913 and the "Water and Steam Test Method for Thermal Power Plant (1984)" of the former Ministry of Water Resources and Electricity of the People's Republic of China.

Author: Hangzhou Water Shield Technology Co., Ltd.

Website: http://www.zjhzsd.com/

Key words: deionized water treatment equipment, coating water treatment equipment, glass tank membrane cleaning water equipment