CN102998235B - Test method for evaluating grit chamber degritting effect in sewage pretreatment phase - Google Patents
Test method for evaluating grit chamber degritting effect in sewage pretreatment phase Download PDFInfo
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- CN102998235B CN102998235B CN201210530977.5A CN201210530977A CN102998235B CN 102998235 B CN102998235 B CN 102998235B CN 201210530977 A CN201210530977 A CN 201210530977A CN 102998235 B CN102998235 B CN 102998235B
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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
The present invention relates to technical field of sewage, specifically a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect.
Background technology
Settling pit is the requisite pre-service facility in municipal sewage plant, in order to remove the sand grains in water inlet after being usually arranged on fine fack, ensures the normal operation of subsequent treatment process and facility.If the sand grains in sewage does not process, entering sewage subsequent processing units, hidden danger will brought to production run, as equipment attrition, the reduction of biochemistry pool useful volume, the blockings of sludge dewatering equipment filter cloth etc. such as line clogging, aggravation water pumps.
At present, to settling pit except the evaluation of sand coarse aggregate ratio is mainly based on the test to Inlet and outlet water sand cut, its method of testing mainly contains suspension sampling method, immersion method and water outlet tamisage etc., but three kinds of method of testings all exist very large deficiency, as ignored the difference of sand grains and suspension; Process operation is complicated, sampling is not representative, can not reflect sand grains size grading; Screen cloth easily blocks.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect, utilize the roughing sand manually adding and join in the water inlet of sand mo(u)ld plan, and adopt the sedimentation device of certain volume to run continuous samples in settling pit Inlet and outlet water turbulent region, the method effectively ensures test result accuracy and simple and quick, can Fast Measurement settling pit to the sand grains removal effect of each particle size range.
Technical scheme of the present invention is:
For evaluating a method of testing for sewage disinfection treatment stage settling pit desanding effect, the sand coarse aggregate ratio of removing namely by calculating settling pit evaluates sewage disinfection treatment stage settling pit desanding effect, comprises the following steps:
(1), the former water sand cut test of settling pit: in the sampling period, get former water water sample continuously in the turbulent region of settling pit inlet channel and carry out settling operation with sedimentation device, the silt particle potpourri that sedimentation device sedimentation is collected is after rinsing screening, dry to constant weight, finally weigh, the sand amount that sedimentation device in the period obtains must be sampled
;
(2), sand is joined: carry out joining sand according to the size grading containing sand in former water in the sampling period;
(3), join sand and add and go out water sampling: sample in the period, evenly add at settling pit water inlet and quantitative join sand
, then settling pit outlet canal turbulent region serial sampling and carry out settling operation with sedimentation device, sedimentation device collect silt particle potpourri through rinsing screening after, dry to constant weight, finally weigh, the sand amount that sedimentation device in the period obtains must be sampled
;
(4) the total except sand coarse aggregate ratio of settling pit, is calculated
: the total of settling pit removes sand coarse aggregate ratio
equal the difference of the total sand of Inlet and outlet water in sample time amount and the ratio of the total sand amount of water inlet; Wherein, settling pit water inlet sand amount is the total sand amount of former water and sand amount of the joining sum added in the sampling period, and the total sand amount in former water equals settling pit inflow
with sedimentation device inflow
ratio and sedimentation device in the former water medium sand amount that obtains
product, settling pit water outlet sand amount equals settling pit inflow
with sedimentation device inflow
ratio and the sand amount that obtains of sedimentation device in the sampling period
product, specifically see formula (1):
（1）；
After formula (1) simplifies:
（2）。
Described settling pit except sand coarse aggregate ratio include in each particle size range of settling pit except sand coarse aggregate ratio
, its concrete calculation procedure is:
The particle size range of sand grains in settling pit is divided into multiple
section, in the sampling period, sedimentation device obtains in former water
the sand amount of particle size range is
, in the sampling period, sedimentation device obtains in water outlet water sample
the sand amount of particle size range is
, settling pit
in particle size range except sand coarse aggregate ratio
equal to sample settling pit Inlet and outlet water in the period
the difference of particle size range sand amount and water inlet
the ratio of particle size range sand amount; Wherein, settling pit is intake
particle size range sand amount is in former water in the sampling period
the sand amount of particle size range and adding
particle size range joins sand amount
sum, in former water
the sand amount of particle size range equals settling pit inflow
with sedimentation device inflow
ratio and sedimentation device in the former water that obtains
particle size range sand amount
product, in settling pit water outlet
the sand amount of particle size range equals settling pit inflow
with sedimentation device inflow
ratio to obtain with sedimentation device in the sampling period
particle size range sand amount
product, specifically see formula (3):
（3）；
After formula (3) simplifies:
（4）。
Serial sampling in described step (3) is until after joining sand throwing to complete 10min, stop sampling.
Described step (1) and the middle temperature of drying of step (3) are 103-105 DEG C.
Described sedimentation device selects volume to be the container of more than 400L, container is provided with water inlet, water delivering orifice, sand collecting hopper, overflow weir, sample tap.
The hydraulic detention time of described sedimentation device is 5-10min.
In described step (1) and step (3) during serial sampling, the sand amount in sampling water sample is greater than 20g.
Described sand of joining selects silica sand, and density is 2.2 × 10
3kg/m
3-2.9 × 10
3kg/m
3, the described size grading scope of joining sand is 0.1-0.5mm.
Described sand amount of joining ensures that in settling pit every cube water inlet, sand cut is lower than 50g.
In described step (1) and step (3), screening employing 35 eye mesh screen carries out wet screening, gets sieve and to fall sample.
Advantage of the present invention is:
The present invention joins sand and the mensuration to settling pit Inlet and outlet water sand cut by adding at settling pit water inlet, and then evaluate settling pit to the removal effect of different-grain diameter sand grains, be that one is simple and efficient in engineer applied, test data is accurately stable, and be suitable for the evaluation test method of dissimilar settling pit desanding effect.
Embodiment
embodiment 1
The present embodiment is used for the test to settling pit desanding effect in municipal effluent pre-service, settling pit treatment scale 200m
3/ h, distribute sand with 80-170 mesh standard sieve mesh screen, sampler comprises submersible sewage pump (15m
3/ h), ball valve, wired hose, support, sedimentation device (500L) etc., the hydraulic detention time 6.5min of sedimentation device.
For evaluating a method of testing for sewage disinfection treatment stage settling pit desanding effect, specifically comprise the steps:
(1), get former water water sample 4h in the turbulent region of settling pit inlet channel continuously and carry out settling operation with the sedimentation device of 500L, the silt particle potpourri that sedimentation device is collected is through 35 eye mesh screen wet screenings and after rinsing, be placed in 103-105 DEG C of drying box and dry to constant weight, finally carry out sieving and weighing, must sample the sand amount that sedimentation device in the period obtains is 25g;
(2), sand is joined: carry out joining sand, in table 1 according to the size grading (see table 1) in former water in the sampling period.
Sand size grading joined by table 1
| Grating/order | ＞170 | 150-170 | 100-150 | 80-100 | ＜80 |
| Number percent/% | 1.74 | 41.86 | 41.04 | 4.97 | 10.39 |
(3), join sand add and go out water sampling: in 1h, what evenly add 10.2kg at settling pit water inlet joins sand, then also carry out settling operation with 500L sedimentation device in the turbulent region serial sampling of settling pit outlet canal, serial sampling is until after joining sand throwing to complete 10min, stop sampling; The silt particle potpourri that sedimentation device sedimentation is collected after rinsing through 35 eye mesh screen wet screenings, is placed in 103-105 DEG C of drying box and dries to constant weight, and finally carries out sieving and weighing, must sample the sand amount 25.8g that sedimentation device in the period obtains;
(4), settling pit is except the calculating of sand coarse aggregate ratio: calculate total except sand coarse aggregate ratio according to formula (1) or (2)
, formula (3) or (4) calculate in each particle size range except sand coarse aggregate ratio
; In 1h settling pit water inlet in roughing sand amount be 270g, be far smaller than institute dosing sand amount 10.2kg, now in former water, sand cut can be ignored, and total desanding efficiency is 89.07%, wherein each particle diameter sand grains except sand coarse aggregate ratio in table 2:
In table 2 settling pit water outlet test in each particle size range except sand coarse aggregate ratio
| Grating/order | ＞170 | 150-170 | 100-150 | 80-100 | ＜80 |
| Clearance/% | 68.33 | 84.32 | 91.64 | 94.03 | 99.18 |
embodiment 2
The present embodiment is used for the test to settling pit desanding effect in municipal effluent pre-service, settling pit treatment scale 1200m
3/ h, distribute sand with 80-170 mesh standard sieve mesh screen, sampler comprises submersible sewage pump (15m
3/ h), ball valve, wired hose, support, sedimentation device (500L) etc., the hydraulic detention time 5.5min of sedimentation device.
For evaluating a method of testing for sewage disinfection treatment stage settling pit desanding effect, specifically comprise the steps:
(1), sample in the period; get former water water sample 3h in the turbulent region of settling pit inlet channel continuously and carry out settling operation with the sedimentation device of 500L; the silt particle potpourri that sedimentation device sedimentation is collected is after 35 mesh sieve choosings also rinsing; be placed in 103-105 DEG C of drying box and dry to constant weight; finally carry out sieving and weighing, must sample the sand amount that sedimentation device in the period obtains is 30g;
(2), sand is joined: join sand, in table 3 according to the sand size grading that contains in former water in the sampling period.
Sand size grading joined by table 3
| Grating/order | ＞170 | 150-170 | 100-150 | 80-100 | ＜80 |
| Number percent/% | 18.07 | 32.30 | 32.57 | 7.11 | 9.95 |
(3), join sand add and go out water sampling: in 1h, what evenly add 33.8kg at settling pit water inlet joins sand, then also carry out settling operation with 500L sedimentation device in the turbulent region serial sampling of settling pit outlet canal, serial sampling is until after joining sand throwing to complete 10min, stop sampling; The silt particle potpourri that sedimentation device sedimentation is collected after rinsing through 35 eye mesh screen wet screenings, is placed in 103-105 DEG C of drying box and dries to constant weight, and finally carries out sieving and weighing, must sample the sand amount 50.06g that sedimentation device in the period obtains;
(4), settling pit is except the calculating of sand coarse aggregate ratio: calculate total except sand coarse aggregate ratio according to formula (1) or (2)
, formula (3) or (4) calculate in each particle size range except sand coarse aggregate ratio
; In 1h, in settling pit water inlet, roughing sand amount is 2.2kg, now in former water, sand cut be can not ignore and disregarded, and in water inlet, total sand cut is 36kg, and the turbulent region gained sand sample after settling pit outlet canal is 50.06g, total desanding efficiency is 69.10%, wherein each particle diameter sand grains except sand coarse aggregate ratio in table 4:
In table 4 settling pit water outlet test in each particle size range except sand coarse aggregate ratio
| Grating/order | ＞170 | 150-170 | 100-150 | 80-100 | ＜80 |
| Clearance/% | 43.39 | 65.02 | 76.74 | 88.53 | 90.59 |
Claims (10)
1., for evaluating a method of testing for sewage disinfection treatment stage settling pit desanding effect, it is characterized in that: comprise the following steps:
(1), the former water sand cut test of settling pit: in the sampling period, get former water water sample continuously in the turbulent region of settling pit inlet channel and carry out settling operation with sedimentation device, the silt particle potpourri that sedimentation device sedimentation is collected is after rinsing screening, dry to constant weight, finally weigh, the sand amount that sedimentation device in the period obtains must be sampled
;
(2), sand is joined: carry out joining sand according to the size grading containing sand in former water in the sampling period;
(3), join sand and add and go out water sampling: sample in the period, evenly add at settling pit water inlet and quantitative join sand
, then settling pit outlet canal turbulent region serial sampling and carry out settling operation with sedimentation device, sedimentation device collect silt particle potpourri through rinsing screening after, dry to constant weight, finally weigh, the sand amount that sedimentation device in the period obtains must be sampled
;
(4) the total except sand coarse aggregate ratio of settling pit, is calculated
: the total of settling pit removes sand coarse aggregate ratio
equal the difference of the total sand of Inlet and outlet water in sample time amount and the ratio of the total sand amount of water inlet; Wherein, settling pit water inlet sand amount is the total sand amount of former water and sand amount of the joining sum added in the sampling period, and the total sand amount in former water equals settling pit inflow
with sedimentation device inflow
ratio and sedimentation device in the former water medium sand amount that obtains
product, settling pit water outlet sand amount equals settling pit inflow
with sedimentation device inflow
ratio and the sand amount that obtains of sedimentation device in the sampling period
product, specifically see formula (1):
（1）；
After formula (1) simplifies:
（2）。
2. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, is characterized in that: described settling pit except sand coarse aggregate ratio include in each particle size range of settling pit except sand coarse aggregate ratio
, its concrete calculation procedure is:
The particle size range of sand grains in settling pit is divided into multiple
section, in the sampling period, sedimentation device obtains in former water
the sand amount of particle size range is
, in the sampling period, sedimentation device obtains in water outlet water sample
the sand amount of particle size range is
, settling pit
in particle size range except sand coarse aggregate ratio
equal to sample settling pit Inlet and outlet water in the period
the difference of particle size range sand amount and water inlet
the ratio of particle size range sand amount; Wherein, settling pit is intake
particle size range sand amount is in former water in the sampling period
the sand amount of particle size range and adding
particle size range joins sand amount
sum, in former water
the sand amount of particle size range equals settling pit inflow
with sedimentation device inflow
ratio and sedimentation device in the former water that obtains
particle size range sand amount
product, in settling pit water outlet
the sand amount of particle size range equals settling pit inflow
with sedimentation device inflow
ratio to obtain with sedimentation device in the sampling period
particle size range sand amount
product, specifically see formula (3):
（3）；
After formula (3) simplifies:
（4）。
3. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, is characterized in that: serial sampling in described step (3) is until after joining sand throwing to complete 10min, stop sampling.
4. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, is characterized in that: described step (1) and the middle temperature of drying of step (3) are 103-105 DEG C.
5. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, it is characterized in that: described sedimentation device selects volume to be the container of more than 400L, container is provided with water inlet, water delivering orifice, sand collecting hopper, overflow weir, sample tap.
6. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, is characterized in that: the hydraulic detention time of described sedimentation device is 5-10min.
7. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, is characterized in that: in described step (1) and step (3) during serial sampling, and the sand amount in sampling water sample is greater than 20g.
8. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, it is characterized in that: described sand of joining selects silica sand, density is 2.2 × 10
3kg/m
3-2.9 × 10
3kg/m
3, the described size grading scope of joining sand is 0.1-0.5mm.
9. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, is characterized in that: described sand amount of joining ensures that in settling pit every cube water inlet, sand cut is lower than 50g.
10. a kind of method of testing for evaluating sewage disinfection treatment stage settling pit desanding effect according to claim 1, is characterized in that: in described step (1) and step (3), screening employing 35 eye mesh screen carries out wet screening, gets sieve and to fall sample.
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| CN106777570A (en) * | 2016-11-30 | 2017-05-31 | 广东粤港供水有限公司 | A kind of rotational flow grit chamber Optimization Design |
| CN107084904A (en) * | 2017-04-28 | 2017-08-22 | 青岛水务集团有限公司科技中心 | The method for determining sludge sand content |
| CN110146122B (en) * | 2019-06-06 | 2020-02-14 | 浙江清华长三角研究院 | Method for predicting operation effectiveness of rural domestic sewage treatment facility |
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| CN102353550A (en) * | 2011-06-08 | 2012-02-15 | 中国石油大学(华东) | Combination property experimental device and performance estimating method for sand-preventing sieve tube |
| CN102798585A (en) * | 2012-08-30 | 2012-11-28 | 上海河口海岸科学研究中心 | Large-size temperature-controllable automatic stirring sedimentation compaction test device and test method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353550A (en) * | 2011-06-08 | 2012-02-15 | 中国石油大学(华东) | Combination property experimental device and performance estimating method for sand-preventing sieve tube |
| CN102798585A (en) * | 2012-08-30 | 2012-11-28 | 上海河口海岸科学研究中心 | Large-size temperature-controllable automatic stirring sedimentation compaction test device and test method thereof |
Non-Patent Citations (3)
| Title |
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| 新型高效旋流沉砂池除砂效果研究;汪家权 等;《中国给水排水》;20070831;第23卷(第15期);98-100页 * |
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