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Surface-treated calcium carbonate and phyllosilicates and their use in water purification

A technology of surface treatment and phyllosilicate, applied in sludge treatment, water/sewage treatment, animal processing wastewater treatment, etc., can solve the problem that the filtrate cannot be easily disposed of

Active Publication Date: 2017-09-12
OMYA INT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the serious environmental concerns associated with water containing polymeric flocculation aids, especially polyacrylamides, this filtrate by its nature cannot be easily disposed of and thus requires further time and cost consuming purification steps to extract from Removal of polymer-type flocculation aids from the filtrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0246] The following illustrative examples relate to the use of a mixture comprising surface treated calcium carbonate and bentonite in combination with a polymeric flocculation aid for the purification of two different sludge samples. The surface-treated calcium carbonate comprises modified calcium carbonate and has a weight median particle size d before surface treatment 50 The value is 1.6 μm (measured according to the sedimentation method) and the specific surface area is 48m 2 / g (measured using nitrogen and BET method). The surface-treated calcium carbonate was covered by a coating comprising polyacrylate with a cationic charge density of 7 mEq / g. Polyacrylate was present in the coating in an amount of 0.95% by weight, based on the dry weight of calcium carbonate. The combination of surface-treated calcium carbonate and bentonite was used in a mixture having a weight ratio of surface-treated calcium carbonate to bentonite of about 1:1. As a polymer-based flocculation ...

Embodiment 2

[0250] Example 2 was performed in a similar manner to Example 1, except that the surface-treated calcium carbonate comprised ground calcium carbonate and that the weight median particle size before surface treatment was d 50 The value is 2.3 μm (measured according to the sedimentation method) and the specific surface area is 28m 2 / g (measured using nitrogen and BET method). The surface-treated calcium carbonate was covered by a coating comprising polyacrylate with a cationic charge density of 7 mEq / g. Polyacrylate was present in the coating in an amount of 0.95% by weight, based on the dry weight of calcium carbonate.

[0251] Like Example 1, Example 2 also achieves a reduced concentration of polymeric flocculation aid.

Embodiment 3

[0253] The following illustrative examples relate to the use of surface treated calcium carbonate and bentonite in combination with polymeric flocculation aids for the purification of two different sludge samples. Bentonite was added to the sludge samples first, followed by surface-treated calcium carbonate. The surface-treated calcium carbonate comprises modified calcium carbonate and has a weight median particle size d before surface treatment 50 The value is 1.7μm (measured according to the sedimentation method) and the specific surface area is 51m 2 / g (measured using nitrogen and BET method). The surface-treated calcium carbonate was covered by a coating comprising polyacrylate with a cationic charge density of 7 mEq / g. Polyacrylate was present in the coating in an amount of 0.95% by weight, based on the dry weight of calcium carbonate. The surface treated calcium carbonate and bentonite were used in a weight ratio of surface treated calcium carbonate to bentonite of a...

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Abstract

The present invention relates to a method for water purification and / or dewatering of sludge and / or sediment, a combination of phyllosilicates and surface-treated calcium carbonate for water purification and / or sludge and / or sediment and the use of phyllosilicates in combination with surface-treated calcium carbonate for reducing the amount of polymeric flocculation aids in water and / or sludge and / or sediment, and relates to the use of The method obtains a composite material comprising at least one surface-treated calcium carbonate, at least one phyllosilicate and impurities originating from different sources. At least 1% of the accessible surface area of ​​the calcium carbonate is covered by a coating comprising at least one cationic polymer.

Description

technical field [0001] The present invention relates to a method for water purification and / or dewatering of sludge and / or sediment, a combination of phyllosilicates and surface-treated calcium carbonate for water purification and / or sludge and / or sediment and the use of phyllosilicates in combination with surface-treated calcium carbonate for reducing the amount of polymeric flocculation aids in water and / or sludge and / or sediment, and relates to the use of The method obtains a composite material comprising at least one surface-treated calcium carbonate, at least one phyllosilicate and impurities originating from different sources. Background technique [0002] Water pollution has caused serious problems all over the world. In this regard, water pollution has been shown to be a major cause of death and disease in developing countries, while industrialized countries also continue to struggle with such pollution problems. In general, water, sludge and sediment are termed wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F1/52C02F1/28C02F103/32C02F103/28C02F103/22C02F103/24C02F101/30C02F1/56C02F101/32C02F11/148
CPCC02F1/288C02F1/5263C02F1/56C02F2101/30C02F2101/301C02F2101/305C02F2101/308C02F2101/32C02F2103/22C02F2103/24C02F2103/28C02F2103/32C02F11/148C02F1/5236C02F2101/10C02F2103/007
Inventor D·E·杰拉尔德M·波费特J·舍尔科普夫M·斯科夫比P·A·C·甘恩
Owner OMYA INT AG