Waste water decontamination

A technology for wastewater and preparations, applied in the fields of water pollutants, water/sewage treatment, chemical instruments and methods, etc., which can solve the problems of specificity, limited general use, increased process complexity, and high labor intensity.

Inactive Publication Date: 2016-11-09
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specificity of application of the aforementioned method limits its general use
Furthermore, the use of many different kinds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1: Preparation of Formulations of the Disclosure

[0074] First 0.1 g of sodium hydroxide was mixed in 0.9 g of deionized water to obtain a 10% sodium hydroxide solution. This 10% sodium hydroxide solution was further mixed with 40 g of cationic starch solution (ISC 2500N, pH 6.5) (obtained from Industrial Specialty Chemical (ISC) Inc., USA) to produce an alkalized cationic starch solution with a pH of 12.5. This alkalized cationic starch solution was then blended with 2 kg of liquid sodium aluminate (Nalco 2, pH 12.5) obtained from Nalco at 150 rpm at 25°C to obtain 2.041 kg of the formulation of the present disclosure.

Embodiment 2

[0075] Example 2: Method for Removing Inorganic Contaminants

[0076]Tests were carried out in a laboratory shock tester in which 400 ppm of the formulation prepared in Example 1 was dosed to waste water from the steel industry (cooling tower discharge) and mixed for a time interval of 3 minutes to 5 minutes. 1 ppm of anionic flocculant (a powdered copolymer of acrylic acid and acrylamide in a molar ratio of 3:7) was then added to each resulting mixture and allowed to settle for 30 minutes. In each case, the supernatant layer was filtered in a glass filter flask loaded with 20 micron filter paper, then the pH was adjusted to 6.5 to 7.0, and the supernatant layer was loaded with 1,00,000 Daltons of polyvinylidene fluoride (PVDF). Dead-end ultrafiltration is performed in the dead-end filter chamber of the ultrafiltration membrane. The purified water obtained after each test was analyzed; the results of some tests are presented below:

[0077] Table 1: Degree of pollutant reduc...

Embodiment 3

[0080] Example 3: Method for Removing Inorganic Contaminants

[0081] Experiments were carried out in a laboratory shock tester in which different levels of formulations according to the invention and soda ash were dosed and mixed for a time interval of 3 minutes to 5 minutes into wastewater from the steel industry (cooling tower discharge). In each case, a powdered copolymer of acrylic acid and acrylamide in a molar ratio of 3:7 was added to the resulting mixture as an anionic flocculant and allowed to settle for 30 minutes. The supernatant layer was filtered in a glass filter flask loaded with 20-micron filter paper, then adjusted to pH 6.5 to 7.0, and filtered on a death cell packed with a 1,00,000 Dalton polyvinylidene fluoride (PVDF) ultrafiltration membrane. Dead-end ultrafiltration is performed in an end-filter chamber. The ultrafiltered water obtained in each case was subjected to reverse osmosis in dead-end filter chambers equipped with Dow BW-30RO membranes. The pu...

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PUM

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Abstract

The present disclosure relates to a formulation and a process for the removal of inorganic impurities from waste water. The formulation consists of a blend of at least one alkali metal aluminate, at least one cationic organic coagulant and optionally at least one alkalinating agent in pre-determined proportions. The process for decontamination using the afore-stated formulation includes steps such as admixing, settling, microfiltration and optionally acidification, ultrafiltration and reverse osmosis. The disclosure further provides an apparatus for the removal of inorganic impurities from waste water.

Description

technical field [0001] The present disclosure relates to the purification of wastewater. Background technique [0002] Wastewater generated in various industrial processes is usually loaded with various inorganic substances such as Na + , Ca 2+ and Cl - , which prevents the wastewater from being used for different downstream purposes. Therefore, it becomes imperative to remove inorganic pollutants from wastewater before it is used for recycling purposes. [0003] Conventionally, removal of inorganic pollutants is accomplished by lime softening. The method involves the use of various chemicals such as lime, soda ash, dolomite, ferric chloride and anionic polyelectrolytes, which makes the method labor intensive, complex, expensive and therefore unaffordable. Optimization of such multiple chemicals is a very challenging task. Furthermore, during the process of obtaining lime from various sources, its quality may vary, which may lead to sub-optimal precipitation of inorgan...

Claims

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Application Information

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IPC IPC(8): C02F1/52
CPCC02F1/001C02F1/441C02F1/444C02F1/5245C02F1/56C02F1/66C02F2101/10C02F2001/007B01D21/01B01D61/025B01D61/147C02F9/00
Inventor 塔伦·库马尔·贝拉马尼什·库马尔·辛格约格什·博勒
Owner ECOLAB USA INC
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