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

A technology of sewage pretreatment and testing method, applied in the direction of removing certain components, weighing, analyzing materials, instruments, etc., can solve problems such as hidden dangers caused by production and operation, clogging of filter cloths of sludge dewatering machines, and complicated process operations. , to achieve stable and accurate test data

Active Publication Date: 2015-07-15
中节能国祯环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the sand in the sewage is not treated, it will bring hidden dangers to the production operation after entering the sewage subsequent treatment unit, such as pipeline blockage, increased wear and tear of water pumps and other equipment, reduction in the effective volume of the biochemical tank, and blockage of the filter cloth of the sludge dewatering machine, etc.
[0003] At present, the evaluation of the sand removal rate of the grit chamber is mainly based on the test of the sand content of the influent and effluent. The test methods mainly include suspended solids sampling, immersion, and effluent screening. Big deficiencies, such as ignoring the difference between sand particles and suspended solids; complicated process operation, unrepresentative sampling, unable to reflect the particle size distribution of sand particles; easy to block the screen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example is used to test the sand removal effect of the grit chamber in the pretreatment of urban sewage, and the scale of the grit chamber is 200m 3 / h, use 80-170 mesh standard sieve to distribute sand, sampling device includes submersible sewage pump (15m 3 / h), ball valve, steel wire hose, support, settling device (500L), etc., the hydraulic retention time of the settling device is 6.5min.

[0031] A test method for evaluating the sand removal effect of a grit chamber in the sewage pretreatment stage, specifically comprising the following steps:

[0032] (1) Continuously take raw water samples for 4 hours in the turbulent flow area of ​​the inlet channel of the grit chamber, and use a 500L settling device for settling operation. The mud-sand mixture collected by the settling device is wet screened with a 35-mesh screen and rinsed, and then placed in a 103- Baked in a drying oven at 105°C to constant weight, and finally sieved and weighed, the amount of sand obt...

Embodiment 2

[0041] This example is used to test the sand removal effect of the grit chamber in the pretreatment of urban sewage, and the grit chamber has a treatment scale of 1200m 3 / h, use 80-170 mesh standard sieve to distribute sand, sampling device includes submersible sewage pump (15m 3 / h), ball valve, steel wire hose, support, settling device (500L), etc., the hydraulic retention time of the settling device is 5.5min.

[0042] A test method for evaluating the sand removal effect of a grit chamber in the sewage pretreatment stage, specifically comprising the following steps:

[0043](1) During the sampling period, take raw water samples continuously for 3 hours in the turbulent flow area of ​​the grit chamber inlet channel and use a 500L settling device for settling operation. Dry in a drying oven at 103-105°C to constant weight, and finally sieve and weigh, and the amount of sand obtained by the sedimentation device during the sampling period is 30g;

[0044] (2) Sand blending: ...

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Abstract

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.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a test method for evaluating the sand removal effect of a grit chamber in the sewage pretreatment stage. Background technique [0002] The grit chamber is an essential pretreatment facility for urban sewage treatment plants. It is usually installed behind fine grids to remove sand particles in the incoming water and ensure the normal operation of subsequent treatment processes and facilities. If the sand in the sewage is not treated, it will bring hidden dangers to the production and operation after entering the sewage subsequent treatment unit, such as pipeline blockage, increased wear of water pumps and other equipment, reduction of effective volume of biochemical tank, and blockage of filter cloth of sludge dewatering machine. [0003] At present, the evaluation of the sand removal rate of the grit chamber is mainly based on the test of the sand content of the influen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/04G01N5/04
Inventor 张辉叶勇周文忠范奎王淦侯红勋
Owner 中节能国祯环保科技股份有限公司