CN102531131A - System and method for controlling adding amount of flocculant - Google Patents

System and method for controlling adding amount of flocculant Download PDF

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Publication number
CN102531131A
CN102531131A CN2012100325822A CN201210032582A CN102531131A CN 102531131 A CN102531131 A CN 102531131A CN 2012100325822 A CN2012100325822 A CN 2012100325822A CN 201210032582 A CN201210032582 A CN 201210032582A CN 102531131 A CN102531131 A CN 102531131A
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China
Prior art keywords
flocculation
partiald
sewage
flocculant
codcr
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Pending
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CN2012100325822A
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Chinese (zh)
Inventor
唐心强
左风华
李勤
王虹
赵文彬
房义来
解洪伟
韩丰谈
孙振华
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SHANDONG DAYU WATER TREATMENT CO Ltd
Taishan Medical University
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SHANDONG DAYU WATER TREATMENT CO Ltd
Taishan Medical University
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Priority to CN2012100325822A priority Critical patent/CN102531131A/en
Publication of CN102531131A publication Critical patent/CN102531131A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a system and a method for controlling an adding amount of a flocculant. Before a flocculation-precipitation procedure in actual sewage treatment, an automatic on-line suspended solid (SS), chemical oxygen demand (CODcr), chroma and turbidity monitor is arranged, the monitor and a sewage flowmeter before a flocculation-precipitation tank transmit data to a central processor in real time, and the central processor substitutes the result into a program (which comprises a regression equation) implanted in the central processor in advance to calculate the optimal adding amount of the flocculant, and indicates a metering pump to timely regulate the adding amount of the flocculant according to a calculation result. Therefore, the adding amount of the flocculant is automatically controlled at any time according to sewage quality change conditions and sewage flow before flocculation, the adding amount of the flocculant is reduced, the effluent quality is stable, and the invention is suitable for the technical field of sewage treatment.

Description

The system and method for control flocculant dosage
Technical field
The invention belongs to technical field of sewage, relate to a kind of sewage water treatment method, relate in particular to a kind of system and method for controlling flocculant dosage.
Background technology
Flocculation--the precipitator method are one of effective important method that reduces suspended substance (SS), COD content and colourity and turbidity in the sewage at sewage treatment area.And behind selected flocculation agent, the quality of flocculation-sedimentation effect and the dosage of flocculation agent are closely related, and up to the present the dosage majority of flocculation agent decides according to laboratory experiment result or experience.The flocculant dosage that draws in view of the above is subject to when experiment water quality situation, when being difficult in the face of WWT the situation of the frequent change of influent quality provide accurately, adjustment timely, thereby cause the reduction of effluent quality or the waste of flocculation agent.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention provides a kind of system and method for controlling flocculant dosage, can reduce the flocculation agent consumption and can guarantee the stable of effluent quality simultaneously, and its technical scheme is following:
A kind of system that controls flocculant dosage; Comprise suspended substance detector, CODcr detector, colorimetric detection appearance, turbidity detector; All be installed on the side in pond of sewage equalizing tank or the former process in flocculation sedimentation tank the place ahead; Also comprise the sewage flowmeter that is installed between equalizing tank and the flocculation sedimentation tank, be installed on the center processor of equalizing tank one side, the flocculant solution pond that is mixed is positioned at flocculation sedimentation tank one side; It is connected with flocculation sedimentation tank through pipeline, is connected with volume pump and line mixer in the middle of the pipeline in turn.
Sewage in the equalizing tank pumps into flocculation sedimentation tank through pipeline; And sewage flowmeter just is installed on the pipeline between equalizing tank and the flocculation sedimentation tank; Be that sewage gets into line mixer from equalizing tank again after pipeline flows into sewage flowmeter; Pipeline through line mixer back entering flocculation sedimentation tank then, simultaneously through data transmission line with flocculation sediment before suspended substance (SS), CODcr, colourity, the flow of turbidity value sewage in the entering flocculation sedimentation tank in the sewage pass to the center processor that is installed on equalizing tank one side.Center processor obtains the best dosage of flocculation agent after data processing, according to the size of this best dosage center processor adjustment volume pump, wherein line mixer has two water-ins simultaneously.
A kind of method of controlling flocculant dosage may further comprise the steps:
1) establish in the i time experiment, the actual dosage of flocculation agent is: y ' i, suspended substance (SS), CODcr, colourity, turbidity are respectively before the flocculation: x 1i, x 2i, x 3i, x 4i, flocculation-post precipitation suspended substance (SS), CODcr, colourity, turbidity are respectively: z 1i, z 2i, z 3i, z 4i, establish with the actual dosage of flocculation agent be y ' i, the best linear equation of match is:
y i=a 1(x 1i-z 1i)+a 2(x 2i-z 2i)+a 3(x 3i-z 3i)+a 4(x 4i-z 4i)+b (1)
Equation (1) is to make each actual dosage y ' iCalculated value y with linear equation iDeviation d iSum of squares:
W = Σ i = 1 m d i 2 = Σ i = 1 m ( y i ′ - y i ) 2
(2)
= Σ i m { y i ′ - [ a 1 ( x 1 i - z 1 i ) + a 2 ( x 2 i - z 2 i ) + a 3 ( x 3 i - z 3 i ) + a 4 ( x 4 i - z 4 i ) + b ] } 2
Minimum linear equation.Therefore, the condition that exists according to extreme value, with Z to parameter a iDifferentiate, and make it equal zero, then:
∂ Z ∂ a 1 = 0 , ∂ W ∂ a 2 = 0 , ∂ W ∂ a 3 = 0 , ∂ W ∂ a 4 = 0 , ∂ W ∂ b = 0 - - - ( 3 )
2) can get best parameter value: a through separating above system of equations 1, a 2, a 3, a 4, b, will be worth substitution equation (1) get final product 4 yuan of 1 regression equations (the coefficient difference in its regression equation of different sewage sources) between the best dosage y of flocculation agent and suspended substance (SS), CODcr, colourity, the actual reduction amount of turbidity:
y=a 1(x 1-z 1)+a 2(x 2-z 2)+a 3(x 3-z 3)+a 4(x 4-z 4)+b (4)
When calculating, the x in the formula (4) 1, x 2, x 3, x 4Be respectively the on-line monitoring value of suspended substance (SS), CODcr, colourity, turbidity in the preceding sewage of flocculation-deposition, z 1, z 2, z 3, z 4Be respectively the target value of suspended substance (SS), CODcr, colourity, turbidity in flocculation-post precipitation sewage.
3) flocculant dosage that utilizes this regression equation calculation to obtain then instructs to be produced.
Beneficial effect of the present invention:
Technical scheme of the present invention according in the WWT work " consumption of flocculation agent not only with suspended substance (SS), the removal amount of CODcr is closely related and also become positively related relation with the reduction value of colourity, turbidity "., great deal of experiment data utilization method of least squares (linear regression analysis) obtained removal amount and colourity, the reduction value of turbidity and 4 yuan of equations of linear regression of flocculant dosage after being handled about suspended substance (SS), CODcr.Technical scheme of the present invention can in time be adjusted the dosage of flocculation agent along with the frequent change of sewage quality before the flocculation sediment.When the present invention reduces flocculation agent consumption save energy, guarantee the stable of effluent quality, have conveniently, characteristics accurately and fast.
Description of drawings
Fig. 1 is the structural representation of flocculation agent system of the present invention.
Embodiment
Below in conjunction with the accompanying drawing embodiment method of the present invention is done explanation in further detail.
With reference to Fig. 1; A kind of system that controls flocculant dosage; Comprise suspended substance detector, CODcr detector, colorimetric detection appearance, turbidity detector, all be installed on the side in pond of sewage equalizing tank or the former process in flocculation sedimentation tank the place ahead, also comprise the sewage flowmeter that is installed between equalizing tank and the flocculation sedimentation tank; Be installed on the center processor of equalizing tank one side; The flocculant solution pond that is mixed is positioned at flocculation sedimentation tank one side, and it is connected with flocculation sedimentation tank through pipeline, is connected with volume pump and line mixer in the middle of the pipeline in turn.
A kind of flocculation agent control method may further comprise the steps:
1) establish in the i time experiment, the actual dosage of flocculation agent is: y ' i, suspended substance (SS), CODcr, colourity, turbidity are respectively before the flocculation: x 1i, x 2i, x 3i, x 4i, flocculation-post precipitation suspended substance (SS), CODcr, colourity, turbidity are respectively: z 1i, z 2i, z 3i, z 4i, establish with the actual dosage of flocculation agent be y ' i, the best linear equation of match is:
y i=a 1(x 1i-z 1i)+a 2(x 2i-z 2i)+a 3(x 3i-z 3i)+a 4(x 4i-z 4i)+b (1)
Equation (1) is to make each actual dosage y ' iCalculated value y with linear equation iDeviation d iSum of squares:
W = Σ i = 1 m d i 2 = Σ i = 1 m ( y i ′ - y i ) 2
(2)
= Σ i m { y i ′ - [ a 1 ( x 1 i - z 1 i ) + a 2 ( x 2 i - z 2 i ) + a 3 ( x 3 i - z 3 i ) + a 4 ( x 4 i - z 4 i ) + b ] } 2
Minimum linear equation.Therefore, the condition that exists according to extreme value, with Z to parameter a iDifferentiate, and make it equal zero, then:
∂ Z ∂ a 1 = 0 , ∂ W ∂ a 2 = 0 , ∂ W ∂ a 3 = 0 , ∂ W ∂ a 4 = 0 , ∂ W ∂ b = 0 - - - ( 3 )
2) can get best parameter value: a through separating above system of equations 1, a 2, a 3, a 4, b, will be worth substitution equation (1) get final product 4 yuan of 1 regression equations (the coefficient difference in its regression equation of different sewage sources) between the best dosage y of flocculation agent and suspended substance (SS), CODcr, colourity, the actual reduction amount of turbidity:
y=a 1(x 1-z 1)+a 2(x 2-z 2)+a 3(x 3-z 3)+a 4(x 4-z 4)+b (4)
When calculating, the x in the formula (4) 1, x 2, x 3, x 4Be respectively the on-line monitoring value of suspended substance (SS), CODcr, colourity, turbidity in the preceding sewage of flocculation-deposition, z 1, z 2, z 3, z 4Be respectively the target value of suspended substance (SS), CODcr, colourity, turbidity in flocculation-post precipitation sewage.
3) flocculant dosage that utilizes this regression equation calculation to obtain then instructs to be produced.
The present invention is before flocculation-deposition operation that actual sewage is handled; Be provided with automatic on-line suspended substance (SS), CODcr, colourity, monitoring turbidimeter; Sewage flowmeter before monitor and the flocculation-settling tank is transferred to center processor with data in real time; Center processor is implanted the best dosage that program in the center processor calculates (comprising regression equation in this program) flocculation agent according to above substitution as a result more in advance, in time adjusts the dosage of flocculation agent then according to calculation result indication volume pump.Thereby realized adjusting at any time based on the size of the sewage quality situation of change and the discharge of sewage before the flocculation the automatic control of the dosage of flocculant, the dosage that has promptly reduced flocculant has guaranteed the stable of effluent quality simultaneously.
The above; Be merely the preferable embodiment of the present invention; Protection scope of the present invention is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the present invention discloses, and the simple change of the technical scheme that obtains or equivalence replacement all fall in protection scope of the present invention with may be obvious that.

Claims (2)

1. system that controls flocculant dosage; It is characterized in that; Comprise suspended substance detector, CODcr detector, colorimetric detection appearance, turbidity detector, all be installed on the side in pond of sewage equalizing tank or the former process in flocculation sedimentation tank the place ahead, also comprise the sewage flowmeter that is installed between equalizing tank and the flocculation sedimentation tank; Be installed on the center processor of equalizing tank one side; The flocculant solution pond that is mixed is positioned at flocculation sedimentation tank one side, and it is connected with flocculation sedimentation tank through pipeline, is connected with volume pump and line mixer in the middle of the pipeline in turn.
2. a flocculation agent control method is characterized in that, may further comprise the steps:
1) establish in the i time experiment, the actual dosage of flocculation agent is: y ' i, suspended substance (SS), CODcr, colourity, turbidity are respectively before the flocculation: x 1i, x 2i, x 3i, x 4i, the post precipitation suspended substance (SS) that flocculates, CODcr, colourity, turbidity are respectively: z 1i, z 2i, z 3i, z 4i, establish with the actual dosage of flocculation agent be y ' i, the best linear equation of match is:
y i=a 1(x 1i-z 1i)+a 2(x 2i-z 2i)+a 3(x 3i-z 3i)+a 4(x 4i-z 4i)+b
This equation can make each actual dosage y ' iCalculated value y with linear equation iDeviation d iSum of squares:
W = Σ i = 1 m d i 2 = Σ i = 1 m ( y i ′ - y i ) 2
= Σ i m { y i ′ - [ a 1 ( x 1 i - z 1 i ) + a 2 ( x 2 i - z 2 i ) + a 3 ( x 3 i - z 3 i ) + a 4 ( x 4 i - z 4 i ) + b ] } 2
Minimum linear equation, the condition that exists according to extreme value, with Z to parameter a iDifferentiate, and make it equal zero, then:
∂ Z ∂ a 1 = 0 , ∂ W ∂ a 2 = 0 , ∂ W ∂ a 3 = 0 , ∂ W ∂ a 4 = 0 , ∂ W ∂ b = 0
2) can get best parameter value: a through the system of equations of separating step 1) 1, a 2, a 3, a 4, b, with the best linear equation of this value substitution step 1) described match, get final product 4 yuan of 1 regression equations between the best dosage y of flocculation agent and suspended substance (SS), CODcr, colourity, the actual reduction amount of turbidity:
y=a 1(x 1-z 1)+a 2(x 2-z 2)+a 3(x 3-z 3)+a 4(x 4-z 4)+b
When calculating, the x in the formula 1, x 2, x 3, x 4Be respectively the on-line monitoring value of suspended substance (SS), CODcr, colourity, turbidity in the preceding sewage of flocculation-deposition, z 1, z 2, z 3, z 4Be respectively the target value of suspended substance (SS), CODcr, colourity, turbidity in flocculation-post precipitation sewage;
3) utilize step 2) in the flocculant dosage that obtains of regression equation calculation instruct and produce.
CN2012100325822A 2012-02-15 2012-02-15 System and method for controlling adding amount of flocculant Pending CN102531131A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103112941A (en) * 2013-01-31 2013-05-22 梁仲佳 Town sewage treatment system
CN103898942A (en) * 2012-12-27 2014-07-02 株式会社日立制作所 Water supply managing and supporting system
CN104310328A (en) * 2014-10-09 2015-01-28 瓮福(集团)有限责任公司 Method for primary purification of phosphoric acid by using wet process
CN105923725A (en) * 2016-06-20 2016-09-07 淄博海星环保科技有限公司 Sewage treatment flocculant and use method thereof
CN106348408A (en) * 2016-08-30 2017-01-25 河南华东工控技术有限公司 Intelligent dosing system
CN106554133A (en) * 2016-11-16 2017-04-05 江苏智石科技有限公司 A kind of sewage disposal automation control system
CN107032461A (en) * 2016-02-03 2017-08-11 青岛海尔洗衣机有限公司 A kind of service water process control method and its device
CN107055732A (en) * 2017-05-17 2017-08-18 北京易沃特科技有限公司 A kind of heavy metals minimizing technology and device
CN111847614A (en) * 2020-08-20 2020-10-30 中法水务管理(中山)有限公司 Accurate dosing method and system
CN112759048A (en) * 2020-12-21 2021-05-07 上海熊猫机械(集团)有限公司 PAC solution intelligent feeding control method
CN113428957A (en) * 2021-06-29 2021-09-24 长沙榔梨自来水有限公司 Polyaluminum chloride adding method suitable for river water
CN115432863A (en) * 2022-11-08 2022-12-06 菲立化学工程(遂昌)有限公司 Urban sewage purification device

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CN202576060U (en) * 2012-03-23 2012-12-05 泰山医学院 System for controlling dosage of flocculating agent

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103898942A (en) * 2012-12-27 2014-07-02 株式会社日立制作所 Water supply managing and supporting system
CN103898942B (en) * 2012-12-27 2015-10-14 株式会社日立制作所 Water supply management support system
CN103112941A (en) * 2013-01-31 2013-05-22 梁仲佳 Town sewage treatment system
CN104310328A (en) * 2014-10-09 2015-01-28 瓮福(集团)有限责任公司 Method for primary purification of phosphoric acid by using wet process
CN107032461A (en) * 2016-02-03 2017-08-11 青岛海尔洗衣机有限公司 A kind of service water process control method and its device
CN105923725A (en) * 2016-06-20 2016-09-07 淄博海星环保科技有限公司 Sewage treatment flocculant and use method thereof
CN106348408B (en) * 2016-08-30 2019-08-09 河南华东工控技术有限公司 A kind of intelligent dosing system
CN106348408A (en) * 2016-08-30 2017-01-25 河南华东工控技术有限公司 Intelligent dosing system
CN106554133A (en) * 2016-11-16 2017-04-05 江苏智石科技有限公司 A kind of sewage disposal automation control system
CN107055732A (en) * 2017-05-17 2017-08-18 北京易沃特科技有限公司 A kind of heavy metals minimizing technology and device
CN111847614A (en) * 2020-08-20 2020-10-30 中法水务管理(中山)有限公司 Accurate dosing method and system
CN112759048A (en) * 2020-12-21 2021-05-07 上海熊猫机械(集团)有限公司 PAC solution intelligent feeding control method
CN113428957A (en) * 2021-06-29 2021-09-24 长沙榔梨自来水有限公司 Polyaluminum chloride adding method suitable for river water
CN115432863A (en) * 2022-11-08 2022-12-06 菲立化学工程(遂昌)有限公司 Urban sewage purification device

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Application publication date: 20120704