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Wastewater treatment system and wastewater treatment method

A wastewater treatment system and biological treatment technology, which is applied in the direction of reflux water treatment, water treatment parameter control, water/sewage multi-stage treatment, etc., can solve the problems of inability to obtain sludge volume reduction effect, poor water quality, and decreased microbial activity in wastewater treatment and other issues to achieve the best sludge volume reduction effect

Active Publication Date: 2022-06-24
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of excess sludge to be treated or the amount of ozone used is insufficient, the expected sludge volume reduction effect cannot be obtained
Conversely, if the above-mentioned amount is too much, microorganisms will be excessively decomposed, and the activity of microorganisms that contribute to wastewater treatment will decrease, so the water quality of treated water may deteriorate

Method used

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  • Wastewater treatment system and wastewater treatment method
  • Wastewater treatment system and wastewater treatment method
  • Wastewater treatment system and wastewater treatment method

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Experimental program
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Effect test

Embodiment approach 1

[0029] Hereinafter, a wastewater treatment system and a wastewater treatment method according to Embodiment 1 of the present invention will be described based on the drawings. figure 1 It is a schematic diagram which shows the structure of the wastewater treatment system which concerns on this Embodiment 1. The wastewater treatment system according to Embodiment 1 includes a biological treatment tank 1, an air diffuser 2, a solid-liquid separation tank 7, a disinfection tank 8, an ozone reaction tank 9, an ozone generator 12, and the like. In addition, in figure 1 Among them, W1 is wastewater that is treated water, W2 is sludge-containing treated water, W3 is treated water, and W4 is discharge water.

[0030] In addition, the wastewater treatment method according to the first embodiment mainly includes a biological treatment step, a solid-liquid separation step, and a reforming step. In the biological treatment step, the organic wastewater W1 is biologically treated under ae...

Embodiment approach 2

[0076] image 3 It is a schematic diagram which shows the structure of the wastewater treatment system which concerns on Embodiment 2 of this invention. In addition, in image 3 in, right and figure 1 The same parts are marked with the same reference numerals. In the wastewater treatment system according to the second embodiment, the ozone concentrator 13 and the ozone gas pressure gauge 15 are included in the piping 14a for ozone injection. The ozone generator 12 and the ozone concentrator 13 are connected by the piping 14c for oxygen return. The configuration other than the above, and the processing and function of each part are the same as those of the above-described first embodiment, so the description is omitted here.

[0077] The ozone concentrator 13 can condense the ozone generated in the ozone generator 12, and can generate|occur|produce high concentration ozone of 400 mg / L or more and a maximum of 2000 mg / L. The ozone concentrator 13 includes an adsorption towe...

Embodiment approach 3

[0085] Figure 5 It is a schematic diagram which shows the structure of the wastewater treatment system which concerns on Embodiment 3 of this invention. In addition, in Figure 5 in, right and figure 1 The same parts are marked with the same reference numerals. The wastewater treatment system according to the third embodiment includes a plurality of ejectors 17 a , 17 b , and 17 c (collectively referred to as ejectors 17 ) having different nozzle diameters, and an ejector liquid line switching valve 22 and an ejector connected to each ejector 17 . The gas line switching valve 23 is installed. The configuration other than the above, and the processing and function of each part are the same as those in the first and second embodiments described above, and therefore the description is omitted here.

[0086] In the third embodiment, the arithmetic and control device 21 is signal-connected to the ejector liquid line switching valve 22 and the ejector gas line switching valve 2...

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Abstract

The invention obtains a waste water treatment system that can control the amount of ozone used even if the amount of excess sludge produced fluctuates, so that the water quality standard of the discharged water can be stably met and the best sludge volume reduction effect can be obtained. The wastewater treatment system determines the sludge extraction flow based on the sludge concentration of the mixed liquid in the biological treatment tank (1) and the preset sludge treatment ratio, and determines the ozone treatment based on the product of the sludge concentration and the sludge extraction flow Ozone usage in . In addition, based on the sludge concentration of the mixed solution, and the water quality data of any one or more of the mixed solution, treated water (W3) and discharged water (W4), the appropriate sludge treatment ratio and the convergence value of the ozone injection amount are obtained, and Adjust the flow rate of sludge extraction and the amount of ozone used to meet the calculated convergence value of the appropriate sludge treatment ratio and ozone injection amount.

Description

technical field [0001] The present invention relates to a waste water treatment system and a waste water treatment method which utilize ozone to reduce the volume of excess sludge produced by biological treatment of organic waste water. Background technique [0002] As a method for treating organic wastewater, treatment using microorganisms such as a standard activated sludge method is widely used. In the treatment using microorganisms, the microorganisms multiply along with the treatment to generate excess sludge containing activated sludge and other floating matter. Since excess sludge is unnecessary sludge in water treatment, it is incinerated and landfilled as industrial waste. In the treatment of such excess sludge, enormous energy and cost are required including securing a new site, and therefore, reduction in the amount of excess sludge generated is required. [0003] As one of the methods for reducing the amount of excess sludge generated, sludge volume reduction t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/12C02F101/30
CPCC02F9/00C02F11/12C02F2209/08C02F2303/06C02F2301/04C02F2101/30C02F1/78C02F3/02Y02W10/10
Inventor 有马芳明明田川恭平
Owner MITSUBISHI ELECTRIC CORP
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