Recovery treatment process for daily chemical wastewater

Abstract

The invention provides a recovery treatment process for daily chemical wastewater. The recovery treatment process comprises the steps of wastewater collection, air floatation treatment, foam separation, surfactant recovery and Fenton treatment. The process is simple in process step, convenient to operate, low in cost and free of pollutants. Meanwhile, a surfactant in the wastewater is recycled asa resource, so the emission of harmful pollutants is reduced, useful resources are recycled, and the process is a sustainable sewage treatment technology.

Description

technical field

[0001] The invention relates to the technical field of sewage treatment, in particular to a recovery and treatment process for daily chemical waste water. Background technique

[0002] Washing powder is an alkaline synthetic detergent. The main components of washing powder are anionic surfactants, a small amount of non-ionic surfactants, plus some additives, phosphate, silicate, sodium sulfate, fluorescent agent, Enzyme, etc., made by mixing, dusting and other processes. In the production process of washing powder, sulfonation reaction is generally involved, so the discharged wastewater is alkaline, and the reaction process requires cooling water.

[0003] Surfactants are called "industrial monosodium glutamate" and are widely used in various fields of national production and life. However, once the surfactant is used, it will be directly discharged into the natural environment. The surfactant discharged into the natural environment is prone to foaming, whi...

Examples

Embodiment 1

[0031] A kind of daily chemical waste water, its COD is 5000mg / L, and described waste water is carried out recovery treatment, comprises the following steps:

[0032] 1) Wastewater collection: Use cooling water to flush the production equipment, so that the daily chemical wastewater flows into the adjustment pool through the sewage pipe after removing large surface impurities through the grid.

[0033] 2) Air flotation treatment: The wastewater in the adjustment tank is sent into the air flotation tank by the lifting pump for physical and chemical treatment, to remove part of COD and most of the suspended solids, and to separate the oil particles and tiny particles in the solution, and finally realize the full separation of solid and liquid. After this step, the COD in the wastewater Cr It is 300mg / L.

[0034] 3) Foam separation: Pass air under pressure into the waste water obtained in step 2), form a large number of microbubbles in the water, make the surfactant in the waste...

Embodiment 2

[0042] A kind of daily chemical waste water, its COD is 6900mg / L, and described waste water is carried out recovery treatment, comprises the following steps:

[0043] 1) Wastewater collection: Use cooling water to flush the production equipment, so that the daily chemical wastewater flows into the adjustment pool through the sewage pipe after removing large surface impurities through the grid.

[0044] 2) Air flotation treatment: Add a small amount of chemical flocculant ferric chloride into the adjustment tank, and send the wastewater in the adjustment tank into the air flotation tank by the lifting pump for physical and chemical treatment, remove part of COD and most of the suspended matter, and separate the water in the solution The oil particles and tiny particles can finally realize the full separation of solid and liquid. After this step, the COD in the wastewater Cr 500mg / L.

[0045] 3) Foam separation: Pass air under pressure into the waste water obtained in step 2),...

technical field

[0001] The invention relates to the technical field of sewage treatment, in particular to a recovery and treatment process for daily chemical waste water. Background technique

[0002] Washing powder is an alkaline synthetic detergent. The main components of washing powder are anionic surfactants, a small amount of non-ionic surfactants, plus some additives, phosphate, silicate, sodium sulfate, fluorescent agent, Enzyme, etc., made by mixing, dusting and other processes. In the production process of washing powder, sulfonation reaction is generally involved, so the discharged wastewater is alkaline, and the reaction process requires cooling water.

[0003] Surfactants are called "industrial monosodium glutamate" and are widely used in various fields of national production and life. However, once the surfactant is used, it will be directly discharged into the natural environment. The surfactant discharged into the natural environment is prone to foaming, whi...

Examples

Embodiment 1

[0031] A kind of daily chemical waste water, its COD is 5000mg / L, and described waste water is carried out recovery treatment, comprises the following steps:

[0032] 1) Wastewater collection: Use cooling water to flush the production equipment, so that the daily chemical wastewater flows into the adjustment pool through the sewage pipe after removing large surface impurities through the grid.

[0033] 2) Air flotation treatment: The wastewater in the adjustment tank is sent into the air flotation tank by the lifting pump for physical and chemical treatment, to remove part of COD and most of the suspended solids, and to separate the oil particles and tiny particles in the solution, and finally realize the full separation of solid and liquid. After this step, the COD in the wastewater Cr It is 300mg / L.

[0034] 3) Foam separation: Pass air under pressure into the waste water obtained in step 2), form a large number of microbubbles in the water, make the surfactant in the waste...

Embodiment 2

[0042] A kind of daily chemical waste water, its COD is 6900mg / L, and described waste water is carried out recovery treatment, comprises the following steps:

[0043] 1) Wastewater collection: Use cooling water to flush the production equipment, so that the daily chemical wastewater flows into the adjustment pool through the sewage pipe after removing large surface impurities through the grid.

[0044] 2) Air flotation treatment: Add a small amount of chemical flocculant ferric chloride into the adjustment tank, and send the wastewater in the adjustment tank into the air flotation tank by the lifting pump for physical and chemical treatment, remove part of COD and most of the suspended matter, and separate the water in the solution The oil particles and tiny particles can finally realize the full separation of solid and liquid. After this step, the COD in the wastewater Cr 500mg / L.

[0045] 3) Foam separation: Pass air under pressure into the waste water obtained in step 2),...