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Process for producing reclaimed water

A manufacturing method, technology of reclaimed water, applied in water treatment parameter control, chemical instruments and methods, water/sewage treatment, etc.

Inactive Publication Date: 2011-02-16
METAWATER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, when the properties of the raw water are good, it is sufficient to add a small amount of ozone, so only a part of the capacity of the large-capacity ozone generator needs to be used, which becomes redundant equipment

Method used

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  • Process for producing reclaimed water
  • Process for producing reclaimed water
  • Process for producing reclaimed water

Examples

Experimental program
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Effect test

Embodiment

[0042] (Example of the invention of claim 1)

[0043] Use the sewage treatment wastewater discharged from the sewage treatment plant as raw water, use figure 1 The device shown produces reclaimed water. The ozone injection amount was set at 6 to 10 mg / L so that the residual ozone concentration in the raw water before coagulation was in the range of 0.3 to 1.0 mg / L. The coagulant uses PAC, and the residual ozone concentration in the raw water before coagulation decreases by 0.1mg / L from 0.5mg / L, and the injection amount of PAC increases by 0.2mg-Al / L, otherwise, when it is above 0.5mg / L , so that the injection amount of PAC is fixed at 3.0mg-Al / L. The water quality of raw water and recycled water at this time is shown in Table 1. In addition, the water quality of regenerated water when the injection amount of PAC was not changed even if the concentration of residual ozone in raw water before coagulation was changed is shown in Table 2 as a comparative example.

[0044] [Tab...

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PUM

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Abstract

Provided is a process by which recycled water of excellent quality can be produced from wastewater at low cost without using a large amount of ozone. The process for producing recycled water comprises: bringing ozone into contact with raw water, such as water resulting from a sewage treatment, using, e.g., an ozone contact column (2) to heighten the coagulability of a solid matter contained in the raw water; thereafter injecting a coagulant with a coagulant-injecting pump (6) to coagulate the solid matter; and filtering the resultant mixture through a separation membrane (8). The raw water before the separation membrane is examined for residual ozone concentration with a dissolved-ozone meter (5). When the quality of the raw water has deteriorated and this has resulted in an ozone demand exceeding the capacity of the ozone generator and hence in a residual ozone concentration lower than a given value, then the amount of the coagulant to be injected is increased. In a region where the ozone demand does not exceed the capacity of the ozone generator, the amount of the coagulant to be added is increased or reduced according to the amount of ozone introduced or the amount of ozone consumed.

Description

technical field [0001] The invention relates to a method for producing recycled water by using sewage treatment water or other waste water as raw water. Background technique [0002] Wastewater such as sewage treatment water discharged from sewage treatment plants is usually discharged into rivers, etc. However, in recent years, due to the need to secure water resources, a method of regenerating waste water to produce reclaimed water has been developed. Since most wastewater contains organic substances, ozone is usually injected to use the strong oxidizing power of ozone to decompose organic substances. In addition, since waste water contains solid components, it is usually filtered using a separation membrane to obtain recycled water. [0003] For example, Patent Document 1 discloses a method of producing reclaimed water by performing ozone pretreatment on sewage treatment water at a low ozone injection rate, biofilm filtration, and then performing membrane filtration at a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/52C02F1/78B01D61/14
CPCB01D61/147C02F1/78B01D2311/04B01D61/16C02F1/5245C02F2209/23C02F2209/03B01D61/145C02F9/00C02F1/444C02F1/44C02F1/5209B01D2311/2642
Inventor 野口基治小园秀树
Owner METAWATER CO LTD
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