Method and system for realizing zero discharge of whole factory wastewater

A zero-discharge, waste water technology, applied in the direction of separation methods, chemical instruments and methods, water/sewage treatment, etc., can solve the difficulties of intermittent large-flow drainage, high equipment investment and operating costs, and high-salt waste water treatment And other issues

Active Publication Date: 2015-06-03
CHENGDU RAISE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Enterprises using boilers such as thermal power plants and industrial kilns discharge various types of wastewater such as circulating water sewage, industrial wastewater, coal-containing wastewater, oil-containing wastewater, and domestic wastewater. Disco

Method used

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  • Method and system for realizing zero discharge of whole factory wastewater
  • Method and system for realizing zero discharge of whole factory wastewater
  • Method and system for realizing zero discharge of whole factory wastewater

Examples

Experimental program
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Embodiment 1

[0047] Such as figure 1 , figure 2 As shown, a method for zero discharge of waste water in the whole plant includes the following steps:

[0048] S1. The wastewater of the whole plant enters the wastewater collection device 1;

[0049] S2. The waste water enters the flue gas wet desulfurization device 2 from the waste water collection device 1;

[0050] S3. The high-temperature dry flue gas enters the flue gas wet desulfurization device 2;

[0051] S4. High-temperature dry flue gas and waste water are in heat exchange contact in the wet flue gas desulfurization device 2, and part of the water in the waste water evaporates to humidify the flue gas and is discharged from the top of the wet flue gas desulfurization device 2; Water accounts for 60-80% of the total amount of raw wastewater;

[0052] S5. The waste water is concentrated after being in contact with the hot flue gas, and discharged together with the desulfurization waste water from the flue gas wet desulfurization...

Embodiment 2

[0068] A method for zero discharge of waste water in the whole plant, such as Image 6 , Figure 7 As shown, its steps are the same as the method for zero discharge of whole plant waste water described in Example 1, and the difference with the method for zero discharge of whole plant waste water described in Example 1 is that in described step S2, after the waste water is collected from the waste water collection device 1 Before entering the wet flue gas desulfurization device 2, it also includes the step of pretreating the wastewater in the wastewater collection device 1, and then leading the pretreated wastewater into the wet flue gas desulfurization device 2. Through the wastewater pretreatment step, part of the water can be recycled and utilized to achieve the purpose of pre-reduction of wastewater cascade utilization, and the remaining concentrated water that cannot be treated enters the flue gas wet desulfurization device 2 . For example, in the pretreatment step, RO re...

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Abstract

The invention discloses a method for realizing zero discharge of whole factory wastewater. The method comprises the following steps: collecting the whole factory wastewater by a wastewater collecting device (1), guiding the collected wastewater into a wet flue gas desulfurization device (2), performing heat exchanging and contacting with a high-temperature dry flue gas coming into the wet flue gas desulfurization device (2), humidifying the flue gas by evaporating part of the water in the wastewater and discharging from the top part of the wet flue gas desulfurization device (2); and discharging the concentrated wastewater along with the desulfurization wastewater from the wet flue gas desulfurization device (2). The invention additionally discloses a system adopting the method for realizing zero discharge of the whole factory wastewater, wherein the system comprises the wastewater collecting device (1), the wet flue gas desulfurization device (2) and the desulfurization wastewater zero discharge device (3) which are in turn connected. The method and the system have the following beneficial effects that a large volume of the wastewater is evaporated and decreased through the high-temperature flue gas in the wet flue gas desulfurization device, so that the heat utilization of the waste high-temperature flue gas is realized and the wastewater volume processed by the zero discharge device is reduced, and then the land occupation, the investment and the running cost of the desulfurization wastewater zero discharge device are all reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method and system suitable for zero discharge of wastewater in thermal power plants, industrial kilns and other enterprises. Background technique [0002] Thermal power plants, industrial kilns and other enterprises that use boilers discharge various waste water such as circulating water sewage, industrial waste water, coal-containing waste water, oily waste water, and domestic waste water. Discontinuous large-flow drainage, especially some high-salt wastewater is difficult to treat. At the same time, the realization of zero discharge of large-volume wastewater requires a large equipment footprint, high equipment investment and operating costs. [0003] Enterprises using boilers such as thermal power plants and industrial kilns have built flue gas desulfurization devices under the domestic "Eleventh Five-Year" environmental protection requirements, of which wet flu...

Claims

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Application Information

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IPC IPC(8): C02F1/16C02F9/10B01D53/78B01D53/48
Inventor 郑伟高燎
Owner CHENGDU RAISE ENVIRONMENTAL PROTECTION TECH CO LTD
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