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Method for treating high COD wastewater

A wastewater treatment and wastewater technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. question

Inactive Publication Date: 2014-08-27
SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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Problems solved by technology

[0005] However, the methods mentioned above have disadvantages
The disadvantages of biological anaerobic treatment and its combination technology are harsh reaction conditions, complex device design and maintenance, and long anaerobic sludge domestication process before the formal device operation; the disadvantages of chemical oxidation treatment and its combination technology are high cost of chemicals, Prone to produce highly toxic by-products

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  • Method for treating high COD wastewater

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Embodiment Construction

[0022] The technical scheme of the present invention will be described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the main purpose of the present invention is to reduce the low boiling point, easily volatile small molecule organic matter (light component) and the high boiling point, difficult to volatilize macromolecular organic matter (heavy component) in the high COD waste water by the mode of decompression evaporation ) separation, the light components are subjected to biological aerobic treatment, and the heavy components are incinerated. Therefore, there are mainly the following four steps.

[0024] Step S1: High COD wastewater is subjected to multi-effect decompression evaporation.

[0025] The boiling point of a substance decreases as the pressure decreases. Therefore, under reduced pressure, substances with low boiling points can easily pass from the liquid phase to the gas phase. There are low-boiling and easily volati...

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Abstract

The invention discloses a method for treating high COD wastewater. The method comprises a first step of subjecting the high COD wastewater to multiple-effect reduced pressure evaporation; a second step of condensing light components; a third step of subjecting a condensate liquid to aerobic biological treatment; and a fourth step of burning an evaporated residual concentrated solution. The processing method has the advantages that a process flow in simple; operations are simple; and a treatment effect is good.

Description

technical field [0001] The invention relates to a method for treating wastewater, more specifically, to a method for treating high COD wastewater. Background technique [0002] Chemical oxygen demand is also called chemical oxygen demand (chemical oxygen demand), referred to as COD. It uses chemical oxidants (such as potassium permanganate) to oxidize and decompose oxidizable substances in water (such as organic matter, nitrite, ferrous salts, sulfides, etc.), and then calculates the oxygen consumption based on the amount of residual oxidants. Like biochemical oxygen demand (BOD), it is an important indicator of water pollution. The unit of COD is ppm or mg / L, and the smaller the value, the lighter the water pollution. [0003] With the technological innovation and rapid development of the industry, more and more wastewater has the characteristics of refractory biodegradability and high COD. For example, the COD of wastewater produced by the chemical industry can be as hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 周珉王琴员帅波王乔刘琴瞿贤康健灵
Owner SHANGHAI CHEM IND PARK SINO FRENCH WATERDEV
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