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Method for treating high-concentration formaldehyde wastewater by using waste alkali

A high-concentration formaldehyde and alkali treatment technology, applied in the environmental field, can solve complex problems, achieve the effects of improving impact resistance, avoiding scaling, and reducing operating costs

Inactive Publication Date: 2010-09-15
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The main product of formose reaction is simple glucose. There are dozens of products detected by gas chromatography, and the various reactants will transform each other, which is very complicated.

Method used

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  • Method for treating high-concentration formaldehyde wastewater by using waste alkali
  • Method for treating high-concentration formaldehyde wastewater by using waste alkali
  • Method for treating high-concentration formaldehyde wastewater by using waste alkali

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Embodiment 1

[0024] Embodiment 1: process certain formaldehyde waste water with the inventive method.

[0025] The sources of waste water are: A. Workshop waste water, with a water volume of 41.6m 3 / h; B, domestic wastewater, water volume 7.7m 3 / h; C, initial rainwater, water volume 96m 3 / Second-rate;

[0026] The design influent formaldehyde concentration of wastewater is about 6900mg / L, and the pH is 3.5.

[0027] The specific steps are as follows:

[0028] (1) After the waste water passes through the grille, it directly enters the regulating tank, which is equipped with a vertical circulation mixer, and the high-speed stirring ensures that the water quality is evenly mixed. The hydraulic retention time of the adjustment tank is 24 hours, and it is pumped into the polymerization reaction tank through the primary lift pump.

[0029] (2) The effluent obtained in step (1) enters the polymerization reaction tank, and the polymerization reaction tank is provided with a frame mixer, an...

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Abstract

The invention belongs to the technical field of environment, in particular to a method for treating high-concentration formaldehyde wastewater by using waste alkali, comprising the following concrete steps of: introducing formaldehyde wastewater with the concentration of 100-10,000mg / L into an adjusting tank and pumping into a polymerization reaction tank, wherein formaldehyde in the wastewater is polymerized into a polysaccharide substance in the polymerization reaction tank; storing waste alkali into a waste alkali storage tank; automatically controlling an electrically operated valve at an outlet of the waste alkali storage tank through an on-line pH meter arranged in the polymerization reaction tank; always keeping the pH value of the polymerization reaction tank be large than 9; automatically controlling an electrically operated valve at an outlet of a steam tube outlet through an on-line thermometer arranged in the polymerization reaction tank and always keeping the temperature of the wastewater in the tank be higher than 40DEG C; controlling the stay time to be 0.1-80 hours by the flow of a lifting pump and ensuring that the concentration of effluent formaldehyde is less than 100mg / L; and carrying out pH and temperature adjustment on effluent to ensure that the wastewater temperature and the pH value meet the requirements for subsequent biochemical reaction. The invention has the advantages of simple and convenient process, low running cost and convenient use.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to a method for treating high-concentration formaldehyde wastewater by using waste alkali. Background technique [0002] Formaldehyde is a colorless gas with a strong pungent odor at room temperature. It is easily soluble in water, can coagulate proteins, and can directly react with proteins and DNA in microorganisms, inhibiting biological activity or causing the death of microorganisms. When the formaldehyde concentration reaches 150mg / L, the microbial activity is half of the original activity, and when it exceeds 200mg / L, the microbial activity is almost completely inhibited, which is carcinogenic and teratogenic to the human body. [0003] In recent years, with the rapid development of chemical, pharmaceutical, and material industries that use formaldehyde as a raw material, the discharge of formaldehyde wastewater is increasing, and the pollution to the enviro...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/34
Inventor 刘霞卢毅明贾志宇
Owner TONGJI UNIV
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