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Method for treating waste water having high hardness

A treatment method and high-hardness technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve the problem of filter membrane clogging and achieve easy cleaning Effect

Inactive Publication Date: 2018-10-23
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the filter membrane for treating high-hardness wastewater is passed through an alkaline cleaning solution, sometimes the metal in the wastewater will further precipitate, causing the problem of filter membrane clogging instead.

Method used

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  • Method for treating waste water having high hardness
  • Method for treating waste water having high hardness
  • Method for treating waste water having high hardness

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 〕

[0035] The method for treating high-hardness wastewater according to one embodiment of the present invention includes: adding a coagulant to the high-hardness drainage ; Filtration process ; process of using microfiltration membrane or ultrafiltration membrane to perform membrane filtration of high hardness drainage after the above coarse filtration process ; using acidic water to filter the above microfiltration membrane or ultrafiltration membrane A step of performing backwashing .

[0036] The method for treating high-hardness drainage is used for treating high-hardness drainage with a calcium hardness of more than 100, and is especially suitable for situations where the calcium hardness is more than 150.

[0037] (high hardness drainage)

[0038] Examples of the high-hardness wastewater treated by this high-hardness wastewater treatment method include primary treatment wastewater of sewage in areas where the hardness of upper water is high. That is, the high-hardness was...

no. 2 approach 〕

[0097] A method for treating high-hardness wastewater according to another embodiment of the present invention includes: a step of adding a coagulant to high-hardness drainage ; The process of coarse filtration ; the process of performing membrane filtration on the high hardness drainage after the above coarse filtration process by using microfiltration membrane or ultrafiltration membrane ; using acidic water to filter the above microfiltration membrane or ultrafiltration The process of backwashing the membrane ; the process of performing membrane treatment on the high-hardness wastewater after the above-mentioned membrane filtration process using the reverse osmosis membrane .

[0098] The process of adding a coagulant, the process of coarse filtration, and the process of membrane filtration in the method for treating high-hardness wastewater of the present embodiment are the same as the process of adding a process of coagulant, the process of coarse filtration, and the proce...

Embodiment approach

[0117] It should be considered that the embodiments disclosed this time are all examples and not restrictive. The scope of the present invention is not limited to the structure of the above-mentioned embodiment, but is shown by a claim, and it is intended that the meaning of a claim and equality and all the changes within a range are included.

[0118] As a treatment method for this high-hardness wastewater, a sedimentation separation step may be provided between the flocculant addition step and the coarse filtration step.

[0119] In this method of treating high-hardness wastewater, the high-hardness wastewater is temporarily stored in a water receiving tank or a water supply tank between each process, or each process is continuously implemented through a pipeline, regardless of the presence or absence of a membrane treatment process, etc. Make an arbitrary selection.

[0120] The wastewater treatment facility used in the method for treating high-hardness wastewater may be a...

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Abstract

A method for treating waste water having high hardness according to one embodiment of the present invention is a method for treating waste water having high hardness, specifically a calcium hardness of 100 or more, and this method comprises: a step for adding a flocculant into the waste water having high hardness; a step for roughly filtering the waste water having high hardness after the flocculant addition step by means of a filter; a step for subjecting the waste water having high hardness after the rough filtration step to membrane filtration with use of a microfiltration membrane or an ultrafiltration membrane; and a step for backwashing the microfiltration membrane or the ultrafiltration membrane with an acidic water. It is preferable that the flocculant is a polyaluminum chloride. It is preferable that the acidic water contains hydrochloric acid or citric acid. It is preferable that this method additionally comprises a step for subjecting the waste water having high hardness after the membrane filtration step to membrane filtration with use of a reverse osmosis membrane. It is preferable that the filter is composed of anthracite. It is preferable that the waste water havinghigh hardness is biologically treated sewage water.

Description

technical field [0001] The invention relates to a treatment method for high-hardness drainage. This application claims priority based on Japanese application No. 2016-049605 filed on March 14, 2016, and uses all the contents described in the above-mentioned Japanese application. Background technique [0002] As a method of treating wastewater, a method of filtering wastewater with an ultrafiltration membrane or a microfiltration membrane after primary treatment such as biological treatment is known. By filtering with an ultrafiltration membrane or a microfiltration membrane, almost all suspended substances such as organic matter in the wastewater can be removed. However, such a filter membrane with a small opening diameter is more likely to be clogged, resulting in a decrease in processing capacity, and therefore backwashing in which washing water is fed in reverse is sometimes required to restore the processing capacity. [0003] There is also drainage with high hardness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D21/01B01D24/00B01D29/01B01D61/04B01D61/16B01D61/58B01D65/06C02F1/52C02F9/02C02F9/04C02F9/14
CPCB01D21/01B01D24/00B01D29/01B01D61/04B01D61/16B01D61/58B01D65/06C02F1/44C02F1/52
Inventor 佐藤长久田中育井田清志森田徹
Owner SUMITOMO ELECTRIC IND LTD
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