Clarification of water and wastewater
DC CAFCFirst Claim
1. A process for clarification of water of raw alkalinity less than or equal to 50 ppm by chemical treatment, said process comprising:
- adding to the water and, prior to or after adding to the water, blending at least one aluminum polymer with a high molecular weight quaternized ammonium polymer in an amount sufficient to form a flocculated suspension in the water and to remove turbidity from the water, said high molecular weight quaternized ammonium polymer comprising at least an effective amount ofhigh molecular weight di-allyl di-methyl ammonium chloride (DADMAC) having a molecular weight of at least approximately 1,000,000 to approximately 3,000,000 andsaid aluminum polymer including at least an effective amount of poly-aluminum hydroxychloride of a basicity equal to or greater than 50%.
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Abstract
This invention provides a process for clarifying waters and wastewaters by using aluminum salts and/or aluminum polymers and newly formulated high molecular weight quaternized polymers. The aluminum polymers and the high molecular weight quaternized polymers are blended in the water or wastewater to form a flocculated suspension, causing liquid-solid separation. The quaternized polymers have a molecular weight of greater than approximately 1,000,000 and have a viscosity greater than about 1,000 cps at a concentration of approximately 20% in water. Preferably, poly-aluminum hydroxychloride, poly-aluminum chloride and poly-aluminum siloxane sulfate are used as aluminum polymers along with high molecular weight quaternized polymers such as di-allyl di-methyl ammonium chloride (DADMAC), to significantly improve liquid-solid separation in waters and wastewaters. Aluminum salts, such as alums and aluminum chloride, can also be used along with the quaternized polymers to clarify water. In addition, algae can be removed from water by blending at least one aluminum salt and/or at least one aluminum polymer with a quaternized polymer.
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Citations
22 Claims
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1. A process for clarification of water of raw alkalinity less than or equal to 50 ppm by chemical treatment, said process comprising:
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adding to the water and, prior to or after adding to the water, blending at least one aluminum polymer with a high molecular weight quaternized ammonium polymer in an amount sufficient to form a flocculated suspension in the water and to remove turbidity from the water, said high molecular weight quaternized ammonium polymer comprising at least an effective amount of high molecular weight di-allyl di-methyl ammonium chloride (DADMAC) having a molecular weight of at least approximately 1,000,000 to approximately 3,000,000 and said aluminum polymer including at least an effective amount of poly-aluminum hydroxychloride of a basicity equal to or greater than 50%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for clarification of water and reduction of color and turbidity of water by chemical treatment of said water, said process comprising:
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adding to the water and, prior to or after adding to the water, blending a combination of at least one aluminum salt and at least one aluminum polymer with a quaternized ammonium polymer in an amount sufficient to form a flocculated suspension in the water and to remove color and turbidity from the water, said quaternized ammonium polymer comprising an effective amount of high molecular weight di-allyl di-methyl ammonium chloride (DADMAC) having a molecular weight of at least approximately 1,000,000 to approximately 3,000,000 and said aluminum polymer including at least an effective amount of polyaluminum hydroxy chloride. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A process for clarification of water and reduction of color and turbidity of water by chemical treatment of said water, said process comprising:
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adding to the water and, prior to or after adding to the water, blending; at least one aluminum salt, at least one aluminum polymer, at least one high molecular weight quaternized ammonium polymer and either low molecular weight epichlorohydrin di-methyl amine (Epi-DMA) having a molecular weight ranging from 20,000 to 500,000, or low molecular weight di-allyl di-methyl ammonium chloride (DADMAC) having a molecular weight ranging from 50,000 to 1,000,000, or a combination of both, wherein the high molecular weight quaternized ammonium polymer includes at least an effective amount of high molecular weight di-allyl of methyl ammonium chloride (DADMAC) having a molecular weight of at least approximately 1,000,000 to approximately 3,000,000 and wherein the aluminum polymer includes at least an effective amount of polyaluminum hydroxy chloride to form a flocculated suspension in the water and remove turbidity from the water. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification