WO2009002192A1 - Procédé de calcul d'une dose chimique de traitement de l'eau - Google Patents

Procédé de calcul d'une dose chimique de traitement de l'eau Download PDF

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Publication number
WO2009002192A1
WO2009002192A1 PCT/NZ2007/000164 NZ2007000164W WO2009002192A1 WO 2009002192 A1 WO2009002192 A1 WO 2009002192A1 NZ 2007000164 W NZ2007000164 W NZ 2007000164W WO 2009002192 A1 WO2009002192 A1 WO 2009002192A1
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WO
WIPO (PCT)
Prior art keywords
water
content
range
calculating
water treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NZ2007/000164
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English (en)
Other versions
WO2009002192A9 (fr
Inventor
Jason Frederick Colton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
H2OPE HOLDINGS Ltd
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H2OPE HOLDINGS Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by H2OPE HOLDINGS Ltd filed Critical H2OPE HOLDINGS Ltd
Priority to AU2007355782A priority Critical patent/AU2007355782B2/en
Priority to PCT/NZ2007/000164 priority patent/WO2009002192A1/fr
Publication of WO2009002192A1 publication Critical patent/WO2009002192A1/fr
Publication of WO2009002192A9 publication Critical patent/WO2009002192A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209—Regulation methods for flocculation or precipitation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/1826—Organic contamination in water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • C02F2209/006—Processes using a programmable logic controller [PLC] comprising a software program or a logic diagram
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/11—Turbidity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/21—Dissolved organic carbon [DOC]

Definitions

  • the present invention relates to a method of calculating a water treatment chemical dose for enabling determination of chemical dose in the treatment of raw water to potable water.
  • the present invention relates to a method of calculating a water treatment chemical dose enabling predictive calculation of chemical dosage applicable in the treatment of any raw water type with or without local WTP pre- calibration.
  • NOM natural organic matter
  • a mixture of hydrophobic and hydrophilic organic compounds in a range of molecular weights contains a mixture of hydrophobic and hydrophilic organic compounds in a range of molecular weights.
  • Compounds with high molecular weight and high hydrophobicity, such as aquatic humics and aquatic fulvics resulting from decaying organic matter like leaves, are more amenable to chemical treatment methods such as coagulation and subsequent solids separation.
  • the coagulant dose required for a given plant and given raw water conditions has traditionally been set based on either the plant operator's experience, physical jar testing, or by a streaming current meter.
  • Streaming current meters operate under feed back process control, measuring the quality of water after coagulant dosing and adjusting the coagulant dose based on that measurement to achieve a target water quality
  • feed forward, or predictive, control methods have been used utilising sampling of raw water, prediction of the chemical dose required and dosing accordingly for a given raw water condition.
  • WO2005022278 discloses a feed forward/feedback control method using calculation of a purity index based on outgoing water turbidity.
  • a low purity index valve causes a feedback controller to increase the chemical dose and a high purity index value causes the feedback controller to decrease the chemical dose to minimise deviation from the outgoing water turbidity set point.
  • the disadvantage with known feedback and feed forward methods is that they can be unreliable with different raw water chemistries with varying particulate and NOM components or with rapidly changing raw water conditions, such as after heavy rain fall, varying WTP flow rate, pH changes resulting from chemical treatment and incomplete mixing of water with the chemical treatment agent.
  • US6408227 discloses a system using predictive dosage based on colour, turbidity and coagulant dosed. Dosage is determined by multiplying the sum of the square colour and turbidity of the untreated water by a conversion factor. The conversion factor is determined by dividing the dosage of coagulant used to achieve the optimum treated water quality by the sum of the square colour and turbidity of the untreated water. US6408227 describes a system and method for controlling effluents in treatment systems using neural networks, genetic algorithms and deterministic models to control WTPs and predict parameters such as chemical dosage.
  • a method of calculating a water treatment chemical dose including the steps of:
  • the calculated SUVA is used to adjust the weightings of the particulate content and NOM content and predicting a water treatment chemical dose from the sum of the particulate content and NOM content.
  • a water treatment chemical dose including the steps of:
  • NOM natural organic matter
  • DOC dissolved organic carbon
  • SUVA UVAbsorbanaf/m] _ and DOQmglL]
  • constants A, B, D, E, F H, I, J, K L, M, N and P are predetermined values which can be applied by the user for any water source or selected by the user for a specific water source and/or WTP to increase the accuracy of the predicted water chemical treatment dose.
  • the constant A is in the range 150 to 300
  • constant B is the range 5 to 50
  • constant D is in the range -2 to -0.2
  • constant E is in the range 0.1 to 1.5
  • constant F is in the range 3 to 5
  • constant H is in the range 2 to 4
  • constant I is in the range 0.001 to 0.005
  • constant J is in the range 1 to 5
  • constant K is in the range 0.5 to 4
  • constant L is in the range 0.1 to 1.5
  • constant M is in the range -10 to -50
  • constant N is in the range -1 to -8
  • constant P is in the range 1 to 1.8.
  • the ultraviolet absorbance is in the range 250 to 750 nanometres (nm).
  • the ultraviolet absorbance is 254 nm.
  • the water treatment chemical is a metal based coagulant.
  • the water treatment chemical is based on aluminium and iron based coagulant.
  • the DOC content of the water is in the range 0 to 50 milligrams per litre (mg/L).
  • the particulate content of the water is in the range 0 to 200 nephelometric turbidity units (NTU).
  • water treatment control method may be used via a control apparatus including a programmable logic unit with computer executable instructions defining the algorithm of the present invention.
  • an additional user selectable coagulation mode enables the user to optimise treatment for either particulate or NOM removal.
  • FIG. 1 shows an illustration of the correlation of specific ultraviolet absorbance factor (SUVA) (the ratio of ultraviolet absorbance and dissolved organic carbon) with the character of NOM water content.
  • SUVA is a component of the algorithm used to implement the present invention.
  • Figure 2 shows a graph illustrating increasing percentage of dissolved organic carbon (DOC) removal with increasing coagulant dose as a result of implementation of the present invention
  • Figure 3 shows a schematic diagram of a feed forward coagulant dosage control process used to implement the present invention
  • FIT refers to Flow Indicating Transmitter
  • AIT refers to Analyser Instrument Transmitter
  • Fx refers to Function block
  • PID refers to Proportional Integral Derivative
  • SP refers to Set point
  • CV refers to Control Value (output from PID block);
  • PV refers to Process value
  • VSD refers to Variable speed drive
  • Figure 4 shows a graph of coagulant dose predictions achieved with the present invention over time compared to coagulant dose predictions derived from a streaming current meter of the prior art
  • Figure 5 shows a composite graph of coagulant dose and water turbidity versus coagulant dose response time using a user and preset mode dosage of the present invention compared to dose predictions derived from a streaming current meter of the prior art.
  • a preferred feed forward coagulant dosage control process used to implement the present invention in a WTP is generally shown by arrow 1.
  • the WTP must have a coagulant dose pump 2 which can automatically be controlled by a control unit 3 configured with a programmable logic unit (not shown) running the algorithm of the present invention.
  • An analyser instrument transmitter (AIT) 4 measures the turbidity, UV254nm absorbance and DOC of the raw water 5.
  • the algorithm of the present invention determines the coagulant dose set point (mg/litre) 6.
  • the raw water 5 flow rate is measured via a flow instrument transmitter (FIT) 7 and the coagulant flow rate 8 via a flow instrument transmitter (FIT) 9.
  • the raw water 5 flow rate is flow paced with the coagulant flow rate 8 via a variable speed drive 10 and the control unit 3.
  • the coagulant flow rate provides the process variable (PV) 11 and allows the actual coagulant dose to be monitored (in Litres/hour).
  • the control unit 3 is capable of using a proportional integral and derivative control block (PID) 12 and function block 12A.
  • PID 12 with output via a control valve (CV) 13 is configured with the required coagulant dose (referred to as the set point (SP) 14 in Litres/hour), the measured coagulant flow (in Litres/hour)' as the PV 11 and the output as the coagulant dose pump stroke 15.
  • Figure 4 shows tracked changes over a time period of 5.5 weeks.
  • Figure 5 shows a raw water quality change event starting at 19:25 and which peaks at 04:25 the next day as measured by water turbidity.
  • the predicted dose of the feed forward control method of the present invention peaks at 04:25 correlating with the peak of water turbidity whereas the known feedback method peaks significantly later at 09:45.
  • Such rapid changes in chemical dosage of the present invention provides for more consistent water quality.
  • the method of the present invention can be used in two user selectable modes of operation: a conventional mode which predicts the lowest coagulant dose possible to achieve particulate removal and an enhanced mode which predicts the lowest coagulant dose to achieve maximum NOM removal.
  • the conventional mode can account for an up to 15% reduction in chemical dosage in comparison to prior art methods.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Food Science & Technology (AREA)
  • Water Supply & Treatment (AREA)
  • Medicinal Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Physical Water Treatments (AREA)

Abstract

Cette invention porte sur un procédé de calcul d'une dose chimique de traitement de l'eau pour permettre la détermination d'une dose chimique dans le traitement d'une eau brute en eau potable. De préférence, la présente invention porte sur un procédé de calcul d'une dose chimique de traitement de l'eau permettant un calcul prédictif d'un dosage chimique applicable dans le traitement de tout type d'eau brute avec ou sans pré-étalonnage WTP local. Le procédé comprend les étapes consistant à: quantifier la turbidité de l'eau en tant que mesure d'une teneur en particules; quantifier l'absorbance ultraviolette de l'eau en tant que première mesure d'une teneur en matière organique naturelle (NOM); quantifier la teneur en carbone organique dissous (DOC) de l'eau en tant seconde de la teneur en NOM; calculer un facteur d'absorbance ultraviolette spécifique (SUVA) comme étant le rapport de l'absorbance ultraviolette et du carbone organique dissous; utiliser le SUAV pour ajuster les pondérations de la teneur en particules et de la teneur en NOM; et prédire une dose chimique de traitement de l'eau à partir de la somme de la teneur en particules et de la teneur en NOM.
PCT/NZ2007/000164 2007-06-22 2007-06-22 Procédé de calcul d'une dose chimique de traitement de l'eau Ceased WO2009002192A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2007355782A AU2007355782B2 (en) 2007-06-22 2007-06-22 A method of calculating a water treatment chemical dose
PCT/NZ2007/000164 WO2009002192A1 (fr) 2007-06-22 2007-06-22 Procédé de calcul d'une dose chimique de traitement de l'eau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NZ2007/000164 WO2009002192A1 (fr) 2007-06-22 2007-06-22 Procédé de calcul d'une dose chimique de traitement de l'eau

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WO2009002192A1 true WO2009002192A1 (fr) 2008-12-31
WO2009002192A9 WO2009002192A9 (fr) 2009-09-24

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013152977A1 (fr) * 2012-04-12 2013-10-17 Endress+Hauser Conducta Gesellschaft Für Mess- Und Regeltechnik Mbh+Co. Kg Procédé pour détecter et/ou contrôler la teneur en matière solide lors du pompage d'eau brute de puits
WO2016205944A1 (fr) * 2015-06-23 2016-12-29 Trojan Technologies Procédé et dispositif pour le traitement d'un fluide contenant un contaminant
CN107922213A (zh) * 2015-08-05 2018-04-17 三菱重工业株式会社 水处理系统、发电成套设备及水处理系统的控制方法
WO2020012017A1 (fr) 2018-07-13 2020-01-16 Suez Groupe Procede de determination d'une dose de coagulant pour le traitement d'une eau brute
WO2020012022A1 (fr) 2018-07-13 2020-01-16 Suez Groupe Procede de determination d'une dose de coagulant pour le traitement d'une eau brute
WO2020099723A1 (fr) * 2018-11-14 2020-05-22 Kemira Oyj Mesure et régulation de matière organique dans un flux d'eaux usées
CN111693522A (zh) * 2020-05-29 2020-09-22 苏州科技大学 一种城市水体污染程度线上表征方法
JP2020168618A (ja) * 2019-04-04 2020-10-15 株式会社東芝 運転支援装置、運転支援方法及びコンピュータプログラム
WO2021140150A1 (fr) 2020-01-10 2021-07-15 Suez Groupe Methode de definition et de regulation d'une dose de coagulant pour un traitement par coagulation d'une eau brute
CN116242793A (zh) * 2023-01-08 2023-06-09 北京工业大学 一种比较不同天然有机物对抗生素光催化去除抑制程度大小的方法
CN118521189A (zh) * 2024-07-25 2024-08-20 浙江大学 一种基于卷积-长短期记忆-注意力的原水浊度控制方法
CN119240882A (zh) * 2024-10-23 2025-01-03 广州市自来水有限公司 混凝剂投药控制方法

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* Cited by examiner, † Cited by third party
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CN114624152B (zh) * 2022-05-16 2022-08-12 生态环境部长江流域生态环境监督管理局生态环境监测与科学研究中心 一种水体颗粒有机碳来源的测试方法及相关设备

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US5489977A (en) * 1993-08-11 1996-02-06 Texaco Inc. Photomeric means for monitoring solids and fluorescent material in waste water using a falling stream water sampler
WO2000064821A1 (fr) * 1999-04-23 2000-11-02 Clear Value, Inc. Systeme de traitement d'eau potable et son procede de fonctionnement

Patent Citations (3)

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US5400137A (en) * 1993-08-11 1995-03-21 Texaco Inc. Photometric means for monitoring solids and fluorescent material in waste water using a stabilized pool water sampler
US5489977A (en) * 1993-08-11 1996-02-06 Texaco Inc. Photomeric means for monitoring solids and fluorescent material in waste water using a falling stream water sampler
WO2000064821A1 (fr) * 1999-04-23 2000-11-02 Clear Value, Inc. Systeme de traitement d'eau potable et son procede de fonctionnement

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013152977A1 (fr) * 2012-04-12 2013-10-17 Endress+Hauser Conducta Gesellschaft Für Mess- Und Regeltechnik Mbh+Co. Kg Procédé pour détecter et/ou contrôler la teneur en matière solide lors du pompage d'eau brute de puits
WO2016205944A1 (fr) * 2015-06-23 2016-12-29 Trojan Technologies Procédé et dispositif pour le traitement d'un fluide contenant un contaminant
US10807882B2 (en) 2015-06-23 2020-10-20 Trojan Technologies Process and device for the treatment of a fluid containing a contaminant
CN107922213A (zh) * 2015-08-05 2018-04-17 三菱重工业株式会社 水处理系统、发电成套设备及水处理系统的控制方法
FR3083869A1 (fr) 2018-07-13 2020-01-17 Suez Groupe Procede de determination d'une dose de coagulant pour le traitement d'une eau brute
FR3083868A1 (fr) 2018-07-13 2020-01-17 Suez Groupe Procede de determination d'une dose de coagulant pour le traitement d'une eau brute
US12071358B2 (en) 2018-07-13 2024-08-27 Suez International Method for determining a dose of coagulant for treating raw water
WO2020012017A1 (fr) 2018-07-13 2020-01-16 Suez Groupe Procede de determination d'une dose de coagulant pour le traitement d'une eau brute
US20210155510A1 (en) * 2018-07-13 2021-05-27 Suez Groupe Method for determining a dose of coagulant for treating raw water
WO2020012022A1 (fr) 2018-07-13 2020-01-16 Suez Groupe Procede de determination d'une dose de coagulant pour le traitement d'une eau brute
WO2020099723A1 (fr) * 2018-11-14 2020-05-22 Kemira Oyj Mesure et régulation de matière organique dans un flux d'eaux usées
CN113039160A (zh) * 2018-11-14 2021-06-25 凯米拉公司 测量和控制废水流中的有机物
JP7234013B2 (ja) 2019-04-04 2023-03-07 株式会社東芝 運転支援装置、運転支援方法及びコンピュータプログラム
JP2020168618A (ja) * 2019-04-04 2020-10-15 株式会社東芝 運転支援装置、運転支援方法及びコンピュータプログラム
WO2021140150A1 (fr) 2020-01-10 2021-07-15 Suez Groupe Methode de definition et de regulation d'une dose de coagulant pour un traitement par coagulation d'une eau brute
FR3106131A1 (fr) 2020-01-10 2021-07-16 Suez Groupe Méthode de définition et de régulation d’une dose de coagulant pour un traitement par coagulation d’une eau brute
JP2023509815A (ja) * 2020-01-10 2023-03-10 スエズ・グループ 原水の凝固処理のための凝固剤の用量を定める及び調整する方法
JP7777523B2 (ja) 2020-01-10 2025-11-28 スエズ インターナショナル 原水の凝集処理のための凝集剤の用量を定める及び調整する方法
CN111693522A (zh) * 2020-05-29 2020-09-22 苏州科技大学 一种城市水体污染程度线上表征方法
CN116242793A (zh) * 2023-01-08 2023-06-09 北京工业大学 一种比较不同天然有机物对抗生素光催化去除抑制程度大小的方法
CN116242793B (zh) * 2023-01-08 2024-06-04 北京工业大学 一种比较不同天然有机物对抗生素光催化去除抑制程度大小的方法
CN118521189A (zh) * 2024-07-25 2024-08-20 浙江大学 一种基于卷积-长短期记忆-注意力的原水浊度控制方法
CN119240882A (zh) * 2024-10-23 2025-01-03 广州市自来水有限公司 混凝剂投药控制方法

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Publication number Publication date
AU2007355782A1 (en) 2008-12-31
AU2007355782B2 (en) 2013-09-19
WO2009002192A9 (fr) 2009-09-24

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