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WO2018039411A1 - Traitement de boues et de floculants au moyen de suspensions colloïdales d'hydroxyde de magnésium insolubles - Google Patents

Traitement de boues et de floculants au moyen de suspensions colloïdales d'hydroxyde de magnésium insolubles Download PDF

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Publication number
WO2018039411A1
WO2018039411A1 PCT/US2017/048333 US2017048333W WO2018039411A1 WO 2018039411 A1 WO2018039411 A1 WO 2018039411A1 US 2017048333 W US2017048333 W US 2017048333W WO 2018039411 A1 WO2018039411 A1 WO 2018039411A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
separating
components
sludges
industrial
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/US2017/048333
Other languages
English (en)
Inventor
Perry Eyster
Bynum HENSON
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.)
Heritage Research Group LLC
Original Assignee
Heritage Research Group LLC
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 Heritage Research Group LLC filed Critical Heritage Research Group LLC
Priority to CA3034877A priority Critical patent/CA3034877A1/fr
Publication of WO2018039411A1 publication Critical patent/WO2018039411A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step

Definitions

  • the present invention relates generally to separating sludges and more particularly to the use of insoluble magnesium hydroxide colloidal suspensions that can be added to sludges and/or floats to aid in separation.
  • the wastewater produced from different kinds of industries normally contains very fine suspended solids, dissolved solids, inorganic and organic particles, metals and other impurities. Due to very small size of the particles and presence of surface charge, the task to bring these particles closer to make heavier mass for settling and filtration becomes challenging.
  • Petroleum refining generates large volumes of oily wastewater. With industrial development, there is increase in the amount of oil used. Oil refining, oil storage, transportation and petrochemical industries in the production process generate a lot of oily wastewater.
  • DNF Dissolved Nitrogen Floatation
  • DNF units force nitrogen under pressure in the form of microscopic bubbles often with a coagulant additive to float particulate matter that has densities near that of water to the top of the unit where they are skimmed off. Solids that are higher in density sink to the bottom where they are collected separately. The middle phase which is absent of solids is sent to wastewater treatment for processing before discharge.
  • the DNF bottom sludge and top float are often combined for further treatment.
  • the present invention relates to processing of the combined DNF sludge and float.
  • Coagulation is the destabilization of colloidal particles brought about by the addition of a chemical reagent known as a coagulant.
  • Flocculation is the agglomeration of destabilized particles into microfloc, and later into bulky floccules which can be settled called floe.
  • Coagulation is the process by which colloidal particles and very fine solid suspensions initially present in a wastewater stream are combined into larger agglomerates that can be separated by means of sedimentation, flocculation, filtration, centrifugation, or other separatory methods. This involves a chemical process in which destabilization of non-settleable particles is realized. These non-settleable particles can include most colloids as well as extremely small solid particles and all solvated (dissolved) particles. These particles form clumps with the help of a coagulant. Coagulation is commonly achieved by adding different types of chemicals (coagulants) to a wastewater stream to promote destabilization of any colloid dispersion present and the agglomeration of the individual resultant colloidal particles. Coagulation is the destabilization of these colloids by neutralizing the electrostatic forces that keep them apart.
  • coagulants chemicals
  • Cationic coagulants provide positive electrostatic charges to reduce the negative electrostatic charges (zeta potential) of the colloids. As a result, these particles collide to form these larger floe particles.
  • Flocculation refers to the coming together of particles by means of a physical or mechanical process resulting in the joining together of large
  • insoluble mineral colloidal suspensions in DNF sludges and floats is used to destabilize DNF sludge and/or float wastes for purposes of separation and component recovery. Further, these materials have improved separation in DNF, Dissolved Air
  • DAF Flotation
  • API Separator American Petroleum Institute Separator
  • the present invention provides a method of separating sludges which comprises:
  • the present invention further provides an improvement in processes for physically separating components of a sludge which improvement comprises adding insoluble magnesium hydroxide colloidal suspension into the sludge prior to physically separating components of the sludge.
  • the present invention relates generally to separating sludges and more particularly to the addition of insoluble magnesium hydroxide colloidal
  • the insoluble colloidal magnesium hydroxide suspension used in the present invention can be obtained from mined sources or formed by precipitation and added as a colloidal suspension to sludges and/or floats. Those familiar with the art will understand the benefits of using these materials to destabilize various types of sludge including DNF, DAF, API, and other sludge and/or float wastes.
  • the present invention involves the introduction of magnesium hydroxide to process sludges which acts to inhibit the effect of accumulated spent flocculent and increase the density of new flocculent such that traditional processing equipment can be used to more effectively process sludges.
  • magnesium hydroxide allows the introduction and/or formation of stable and pumpable, high concentration suspensions without detrimentally altering pH or significantly increasing total solids content.
  • the low solubility results in a diffuse solids component with suitable charge that adds density to the floe and allows for easy settling or centrifugation from the water and oil components of the sludges.
  • Adding an insoluble colloidal magnesium hydroxide suspension into an industrial sludge according to the present invention causes colloidal particles and very fine solid suspensions initially present in the industrial sludge to combine into larger agglomerates that can be separated by means of sedimentation, flocculation, filtration, centrifugation, or other separatory methods.
  • the insoluble colloidal magnesium hydroxide suspensions of the present invention can include mined material suspended in an aqueous solution or precipitated from soluble compounds to yield suspended solids.
  • the insoluble colloidal mineral suspensions used in the present invention can have as little of 25% percent solids by weight and up to 65% percent solids by weight with about 50-60% solids by weight being generally suitable for purposes of the present invention.
  • dry solids of finely divided magnesium hydroxide can be added to the sludge and then dispersed.
  • this alternative does not afford the ease of addition or certainty of thorough solids distribution.
  • exemplary sludges include industrial wastewater sludges in general, refinery sludges and in particular sludges from processes such as DNF, DAF, API separators, and tank clean-out sludges.
  • flocculants/coagulants can also be used including mineral, natural and synthetic materials as well as those listed above.
  • DNF sludge and float were transferred from a DNF tank to a smaller tank where a 50-60% solids by weight suspension of magnesium hydroxide was added at 1 .75% by volume of the DNF sludge and float.
  • a coagulant water soluble cationic polymer
  • the combined mixture was heated from ambient temperature to 170° F. The heated material was then fed to a three phase centrifuge to separate clean water (centrate), oils and solids. The centrate had the
  • Example 2 Another characteristic of having less than 1 % particulate solids and could be sent back (recovered and recycled) to the DNF or sent on to wastewater treatment. The oil could be recovered (and recycled) and the solids could be disposed of.
  • Example 2

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

L'invention concerne un procédé de séparation de boue qui implique l'ajout d'une suspension colloïdale minérale insoluble dans une boue industrielle pour déstabiliser la boue industrielle et séparer les composants déstabilisés de la boue industrielle. La suspension colloïdale minérale insoluble comprend de l'hydroxyde de magnésium. Dans un autre mode de réalisation, de l'hydroxyde de magnésium finement divisé sec peut être ajouté puis dispersé dans une boue industrielle. Des floculants et/ou coagulants classiques peuvent également être ajoutés. Des procédés de séparation physique classiques peuvent être utilisés pour séparer la boue industrielle déstabilisée.
PCT/US2017/048333 2016-08-24 2017-08-24 Traitement de boues et de floculants au moyen de suspensions colloïdales d'hydroxyde de magnésium insolubles Ceased WO2018039411A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA3034877A CA3034877A1 (fr) 2016-08-24 2017-08-24 Traitement de boues et de floculants au moyen de suspensions colloidales d'hydroxyde de magnesium insolubles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662379014P 2016-08-24 2016-08-24
US62/379,014 2016-08-24

Publications (1)

Publication Number Publication Date
WO2018039411A1 true WO2018039411A1 (fr) 2018-03-01

Family

ID=61245334

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2017/048333 Ceased WO2018039411A1 (fr) 2016-08-24 2017-08-24 Traitement de boues et de floculants au moyen de suspensions colloïdales d'hydroxyde de magnésium insolubles

Country Status (2)

Country Link
CA (1) CA3034877A1 (fr)
WO (1) WO2018039411A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674402A (en) * 1993-06-17 1997-10-07 Kemira Kemi Ab Method for the treatment of water treatment sludge
US20020088758A1 (en) * 2000-11-02 2002-07-11 Blumenschein Charles D. Method and apparatus for treatment of water and wastewater
US20110089109A1 (en) * 2003-10-17 2011-04-21 Hans David Ulmert Method for treatment of sludge
US20130240442A1 (en) * 2012-03-16 2013-09-19 Ravi Chidambaran Process for purification of produced water
US20130313199A1 (en) * 2012-05-23 2013-11-28 High Sierra Energy, LP System and method for treatment of produced waters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674402A (en) * 1993-06-17 1997-10-07 Kemira Kemi Ab Method for the treatment of water treatment sludge
US20020088758A1 (en) * 2000-11-02 2002-07-11 Blumenschein Charles D. Method and apparatus for treatment of water and wastewater
US20110089109A1 (en) * 2003-10-17 2011-04-21 Hans David Ulmert Method for treatment of sludge
US20130240442A1 (en) * 2012-03-16 2013-09-19 Ravi Chidambaran Process for purification of produced water
US20130313199A1 (en) * 2012-05-23 2013-11-28 High Sierra Energy, LP System and method for treatment of produced waters

Also Published As

Publication number Publication date
CA3034877A1 (fr) 2018-03-01

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