METHODS AND SYSTEMS FOR REDUCING BIOFOULING OF MICROFILTRATION MEMBRANES
First Claim
1. A method for reducing biofouling of microfiltration membranes by a biomolecule-based exopolymeric substance, the method comprising:
- providing impound water comprising a biomolecule-based exopolymeric substance;
reacting the impound water with calcium oxide or calcium hydroxide to generate a calcium-treated biomolecule-based exopolymeric substance mixture;
encapsulating the biomolecule-based exopolymeric substance into filterable, non-tacky particles by reacting the calcium-treated biomolecule-based exopolymeric substance mixture with an aluminum-based inorganic coagulant and a low molecular weight cationic polymer;
removing a first portion of the encapsulated biomolecule-based exopolymeric substance as bulk solid; and
removing a second portion of the encapsulated biomolecule-based exopolymeric substance by low pressure microfiltration through a microfiltration membrane comprising a pore size of between about 0.7 to 12 microns,wherein encapsulating the biomolecule-based exopolymeric substance into filterable, non-tacky particles reduces biofouling of the microfiltration membrane.
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Abstract
Systems and methods for reducing biofouling of microfiltration membranes that are biofouled with biological substances are disclosed. The methods include providing impound water containing biomolecule-based exopolymeric substances, reacting with calcium oxide or calcium hydroxide, encapsulating the exopolymeric substance into filterable non-tacky particles by reacting with an inorganic coagulant and a low molecular weight polymer, and microfiltering to remove the filterable non-tacky particles encapsulating the exopolymeric substances. The filterable non-tacky particles encapsulate the exopolymeric substances and prevent the exopolymeric substances from biofouling the microfiltration membranes.
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Citations
20 Claims
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1. A method for reducing biofouling of microfiltration membranes by a biomolecule-based exopolymeric substance, the method comprising:
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providing impound water comprising a biomolecule-based exopolymeric substance; reacting the impound water with calcium oxide or calcium hydroxide to generate a calcium-treated biomolecule-based exopolymeric substance mixture; encapsulating the biomolecule-based exopolymeric substance into filterable, non-tacky particles by reacting the calcium-treated biomolecule-based exopolymeric substance mixture with an aluminum-based inorganic coagulant and a low molecular weight cationic polymer; removing a first portion of the encapsulated biomolecule-based exopolymeric substance as bulk solid; and removing a second portion of the encapsulated biomolecule-based exopolymeric substance by low pressure microfiltration through a microfiltration membrane comprising a pore size of between about 0.7 to 12 microns, wherein encapsulating the biomolecule-based exopolymeric substance into filterable, non-tacky particles reduces biofouling of the microfiltration membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for removing polysaccharide-based exopolymeric substance from an aqueous mixture, the method comprising:
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providing an aqueous mixture, the aqueous mixture containing exopolymeric substance and one or more of dissolved solids, suspended solids or heavy metals; reacting the aqueous mixture with calcium oxide or calcium hydroxide to generate a calcium-treated mixture; encapsulating the polysaccharide-based exopolymeric substance into filterable, non-tacky particles by reacting the calcium-treated mixture with aluminum chlorohydrate and epi-dma (poly(epichlorhydrin-dimethylamine); mechanically removing a first portion of the encapsulated polysaccharide-based exopolymeric substance as bulk solid; and microfiltering to remove a second portion of the encapsulated polysaccharide-based exopolymeric substance. - View Dependent Claims (11, 12, 13, 14)
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15. A system for removing microfiltration membrane-fouling biological substances from impound water, the system comprising:
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influent impound water containing a microfiltration membrane-fouling biological substance; a chemical treatment system configured to first react calcium oxide or calcium hydroxide with the impound water and then react with aluminum chlorohydrate and epi-dma (poly(epichlorhydrin-dimethylamine) to encapsulate the biological substance into filterable non-tacky particles; a clarifier configured to remove a first portion of the encapsulated biological substance as bulk solid; and a microfiltration system configured to remove a second portion of the filterable non-tacky particles with a microfiltration membrane. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification