Method for comprehensively treating high salt content organic industrial wastewater

Abstract

The present invention provides a method for comprehensively treating high salt content organic industrial wastewater, and relates to the field of the organic material preparing technique. The method of the invention mainly comprises the following steps: executing acid-alkali adjustment to the organic wastewater until pH=7-9, preheating to 30-60 DEG C; introducing the wastewater into a triple effect evaporator for executing triple effect evaporation, executing salting out to the evaporated wastewater which is condensed to a certain degree so that the solid and liquid are separated; separating the concentrated liquid for continuing the condensation; when the separated liquid satisfies a certain requirement, atomizing into an incinerator for incinerating and discharging according to the standard, and introducing the triple effect evaporation condensation water into a biochemical treating system. The method of the invention can totally dispose and remove the organic matter in the high salt content organic industrial wastewater so that the high salt content organic industrial wastewater can be charged according to the standard. The method of the invention has the advantages of unique method, simple technical process, easy operation, low operation cost, large treating capacity, low regeneration energy consumption, no easy forming of secondary pollution after abandon, better economic and social benefit, and wide application range. The method of the invention can be widely applied for the treating of the high salt content organic wastewaters of garbage penetrating fluid, dye intermediate wastewater, etc.

Description

technical field

[0001] The present invention relates to the technical field of organic wastewater treatment methods. Background technique

[0002] Organic wastewater with high salt content such as garbage permeate, dye intermediate wastewater (such as m-aminobenzenesulfonic acid, m-hydroxy-N,N-diethylaniline), etc. The high salt content is 10,000-300,000 mg / L, and the chemical oxygen demand is 1,000 mg / L-100,000 mg / L. The wastewater has the characteristics of high toxicity, high organic matter and salt content, and poor biodegradability. It is difficult to treat. Chemical oxygen demand and chromaticity are important factors that make it difficult for this type of wastewater treatment to reach the standard. At present, the domestic treatment methods for refractory organic wastewater include biological methods, physicochemical methods, and oxidation methods.

[0003] Biological method is currently the most widely used wastewater treatment method in China, including biofilm m...

Examples

Embodiment 1

[0039] Example 1: Take the treatment of m-hydroxy-N,N-diethylaniline wastewater as an example.

[0040] Step 1: Put the waste water into three-effect evaporation for negative pressure concentration.

[0041] The test results of m-hydroxy-N, N-diethylaniline wastewater are: chemical oxygen demand 28000-32000mg / L, salt content 280000-300000mg / L, pH7

[0042] ①Adjustment tank: pump the wastewater into the aeration adjustment tank with a pipe-through aeration device for uniform mixing, the purpose is to stabilize the quality of the wastewater.

[0043] ②Wastewater preheating: Heat the wastewater in the regulating tank to 40-50°C through a heat exchanger using the secondary steam generated by the three-effect evaporator as the heat source

[0044] ③ One-effect evaporation: the waste water passing through the preheater enters the one-effect evaporator, the influent flow rate is maintained at 5-6m3 / h, the specific gravity is 1.16g / cm3, and the liquid level of the evaporator is kept at...

Embodiment 2

[0077] Embodiment 2: Take the treatment of m-aminobenzenesulfonic acid wastewater as an example:

[0078] Step 1: Enter the waste water into the three-effect evaporation for negative pressure concentration.

[0079] The test results of m-aminobenzenesulfonic acid wastewater are: chemical oxygen demand 85000~100000mg / L, salt content 160000~180000mg / L, pH 2~3

[0080] ①Adjustment pool: pump the waste water into the aeration adjustment pool with the aeration device through the pipe, add sodium hydroxide to adjust the pH to 7~8 and carry out aeration and uniform mixing.

[0081] ②Wastewater preheating: Heat the wastewater in the regulating tank to 40-50°C through a heat exchanger using the secondary steam generated by the three-effect evaporator as the heat source

[0082]③ One-effect evaporation: the waste water passing through the preheater enters the one-effect evaporator, the influent flow rate is maintained at 5-6m3 / h, the specific gravity is 1.18g / cm3, the liquid level of t...

Embodiment 3

[0115] Embodiment 3: Take the treatment of m-aminobenzenesulfonic acid and m-hydroxyl-N, N-diethylaniline mixed wastewater as an example:

[0116] Step 1: Enter the waste water into three-effect evaporation for negative pressure concentration.

[0117] The test results of m-aminobenzenesulfonic acid wastewater are: chemical oxygen demand 85000~100000mg / L, salt content 160000~180000mg / L, pH 2~3.

[0118] The test results of m-hydroxy-N, N-diethylaniline wastewater are: chemical oxygen demand 28000-32000mg / L, salt content 280000-300000mg / L, pH 7, mixing ratio 1:1

[0119] ①Adjusting tank: pump m-aminobenzenesulfonic acid wastewater into the aeration adjusting tank with aeration device through the pipe, add sodium hydroxide to adjust the pH to 7~8 and carry out aeration and uniform mixing. At the same time, m-hydroxy-N, N-diethylaniline wastewater is mixed with m-aminobenzenesulfonic acid wastewater in a ratio of 1:1.

[0120] ②Wastewater preheating: the wastewater mixed evenly...

technical field

[0001] The present invention relates to the technical field of organic wastewater treatment methods. Background technique

[0002] Organic wastewater with high salt content such as garbage permeate, dye intermediate wastewater (such as m-aminobenzenesulfonic acid, m-hydroxy-N,N-diethylaniline), etc. The high salt content is 10,000-300,000 mg / L, and the chemical oxygen demand is 1,000 mg / L-100,000 mg / L. The wastewater has the characteristics of high toxicity, high organic matter and salt content, and poor biodegradability. It is difficult to treat. Chemical oxygen demand and chromaticity are important factors that make it difficult for this type of wastewater treatment to reach the standard. At present, the domestic treatment methods for refractory organic wastewater include biological methods, physicochemical methods, and oxidation methods.

[0003] Biological method is currently the most widely used wastewater treatment method in China, including biofilm m...

Examples

Embodiment 1

[0039] Example 1: Take the treatment of m-hydroxy-N,N-diethylaniline wastewater as an example.

[0040] Step 1: Put the waste water into three-effect evaporation for negative pressure concentration.

[0041] The test results of m-hydroxy-N, N-diethylaniline wastewater are: chemical oxygen demand 28000-32000mg / L, salt content 280000-300000mg / L, pH7

[0042] ①Adjustment tank: pump the wastewater into the aeration adjustment tank with a pipe-through aeration device for uniform mixing, the purpose is to stabilize the quality of the wastewater.

[0043] ②Wastewater preheating: Heat the wastewater in the regulating tank to 40-50°C through a heat exchanger using the secondary steam generated by the three-effect evaporator as the heat source

[0044] ③ One-effect evaporation: the waste water passing through the preheater enters the one-effect evaporator, the influent flow rate is maintained at 5-6m3 / h, the specific gravity is 1.16g / cm3, and the liquid level of the evaporator is kept at...

Embodiment 2

[0077] Embodiment 2: Take the treatment of m-aminobenzenesulfonic acid wastewater as an example:

[0078] Step 1: Enter the waste water into the three-effect evaporation for negative pressure concentration.

[0079] The test results of m-aminobenzenesulfonic acid wastewater are: chemical oxygen demand 85000~100000mg / L, salt content 160000~180000mg / L, pH 2~3

[0080] ①Adjustment pool: pump the waste water into the aeration adjustment pool with the aeration device through the pipe, add sodium hydroxide to adjust the pH to 7~8 and carry out aeration and uniform mixing.

[0081] ②Wastewater preheating: Heat the wastewater in the regulating tank to 40-50°C through a heat exchanger using the secondary steam generated by the three-effect evaporator as the heat source

[0082]③ One-effect evaporation: the waste water passing through the preheater enters the one-effect evaporator, the influent flow rate is maintained at 5-6m3 / h, the specific gravity is 1.18g / cm3, the liquid level of t...

Embodiment 3

[0115] Embodiment 3: Take the treatment of m-aminobenzenesulfonic acid and m-hydroxyl-N, N-diethylaniline mixed wastewater as an example:

[0116] Step 1: Enter the waste water into three-effect evaporation for negative pressure concentration.

[0117] The test results of m-aminobenzenesulfonic acid wastewater are: chemical oxygen demand 85000~100000mg / L, salt content 160000~180000mg / L, pH 2~3.

[0118] The test results of m-hydroxy-N, N-diethylaniline wastewater are: chemical oxygen demand 28000-32000mg / L, salt content 280000-300000mg / L, pH 7, mixing ratio 1:1

[0119] ①Adjusting tank: pump m-aminobenzenesulfonic acid wastewater into the aeration adjusting tank with aeration device through the pipe, add sodium hydroxide to adjust the pH to 7~8 and carry out aeration and uniform mixing. At the same time, m-hydroxy-N, N-diethylaniline wastewater is mixed with m-aminobenzenesulfonic acid wastewater in a ratio of 1:1.

[0120] ②Wastewater preheating: the wastewater mixed evenly...