Sludge hydrolysis device and hydrolysis process

Abstract

The invention discloses a sludge hydrolysis device. The hydrolysis device comprises a sludge regulation tank, a heat exchanger, a tube nest hydrolysis reactor and a gas-liquid separation device which are connected in sequence through a pipeline, wherein the water outlet of the tube nest hydrolysis reactor is connected with a nozzle at the inner upper part of the gas-liquid separation device through a pipeline; the gas outlet in the top of the gas-liquid separation device is connected with a gas distributor at the bottom of the sludge regulation tank; the liquid outlet in the bottom of the gas-liquid separation device is connected with the water inlet in the bottom of the tube nest hydrolysis reactor; a sludge liquid outlet in the middle of the gas-liquid separation device is connected with the heat exchanger. A hydrolysis process comprises the following steps: 1), adjusting a pH value of a sludge stock solution to 8.5-9.0; 2), allowing the sludge liquid to be subjected to hydrolysis reaction under the 0.3-1.0 Mpa at the temperature of 150-180 DEG C; 3), performing gas-liquid separation on the sludge liquid subjected to hydrolysis, wherein the generated gas is used for primary heating of the sludge stock solution, one part of the generated sludge liquid is used for secondary heating of the sludge stock solution, and the other part of the sludge liquid flows back to the step 2 for hydrolysis reaction again.

Description

technical field

[0001] The invention relates to a sludge hydrolysis device and a process for treating sludge generated in municipal and industrial wastewater treatment processes, belonging to the field of environmental protection water treatment. Background technique

[0002] With the development of my country's social economy, the amount of wastewater that needs to be treated and the treatment standards are increasing and improving, and the corresponding sludge production is also increasing. If the sludge is not properly treated, it will pose a huge pollution threat to the environment. For a long time, my country's wastewater treatment has the phenomenon of "heavy water and light mud". According to reports, only 20% of the sludge has been stabilized, and most of the sludge has been directly landfilled without treatment. This has not only become an environmentally safe Huge hidden danger, and it is a waste of resources. The research and application of sludge treatment techno...

Examples

Embodiment 1

[0039] Using the device and process of the present invention, the municipal sludge with a concentration of 90% after desanding is continuously treated, and the treatment capacity is 15 tons / day. The parameters during the processing are set as follows:

[0040] 1) The sludge stock solution is lifted into the sludge regulating tank 1 by the pump, and at the same time, sodium hydroxide in the dosing device connected to the sludge regulating tank 1 is added to the sludge regulating tank 1, and mixed in the agitator 12 Under the action, the pH value of the sludge stock solution in the sludge adjustment tank 1 is adjusted to 8.5-9.0;

[0041] 2) The sludge liquid after pH adjustment is lifted into the heat exchanger 2 by the pump, and after heat exchange with the hot sludge liquid from the gas-liquid separator 3, it is lifted by the pump into the tubular hydrolysis reactor 4, The superficial linear velocity of the sludge in the tube 41 is controlled at 0.1m / s, and at the same time,...

Embodiment 2

[0047] Using the device and process of the present invention, the municipal sludge with a concentration of 90% after desanding is continuously treated, and the treatment capacity is 15 tons / day. The parameters during the processing are set as follows:

[0048] 1) The sludge stock solution is lifted into the sludge regulating tank 1 by the pump, and at the same time, sodium hydroxide in the dosing device connected to the sludge regulating tank 1 is added to the sludge regulating tank 1, and mixed in the agitator 12 Under the action, the pH value of the sludge stock solution in the sludge adjustment tank 1 is adjusted to 8.5-9.0;

[0049] 2) The sludge liquid after pH adjustment is lifted into the heat exchanger 2 by the pump, and after heat exchange with the hot sludge liquid from the gas-liquid separator 3, it is lifted by the pump into the tubular hydrolysis reactor 4, The superficial linear velocity of the sludge in the tube 41 is controlled at 0.2m / s. At the same time, hig...

Embodiment 3

[0055] Using the device and process of the present invention, the municipal sludge with a concentration of 95% after desanding is continuously treated, and the treatment capacity is 20 tons / day. The parameters during the processing are set as follows:

[0056] 1) The sludge stock solution is lifted into the sludge regulating tank 1 by the pump, and at the same time, sodium hydroxide in the dosing device connected to the sludge regulating tank 1 is added to the sludge regulating tank 1, and mixed in the agitator 12 Under the action, the pH value of the sludge stock solution in the sludge adjustment tank 1 is adjusted to 8.5-9.0;

[0057] 2) The sludge liquid after pH adjustment is lifted into the heat exchanger 2 by the pump, and after heat exchange with the hot sludge liquid from the gas-liquid separator 3, it is lifted by the pump into the tubular hydrolysis reactor 4, The superficial linear velocity of the sludge in the tubes 41 is controlled at 0.2m / s, and at the same time...

technical field

[0001] The invention relates to a sludge hydrolysis device and a process for treating sludge generated in municipal and industrial wastewater treatment processes, belonging to the field of environmental protection water treatment. Background technique

[0002] With the development of my country's social economy, the amount of wastewater that needs to be treated and the treatment standards are increasing and improving, and the corresponding sludge production is also increasing. If the sludge is not properly treated, it will pose a huge pollution threat to the environment. For a long time, my country's wastewater treatment has the phenomenon of "heavy water and light mud". According to reports, only 20% of the sludge has been stabilized, and most of the sludge has been directly landfilled without treatment. This has not only become an environmentally safe Huge hidden danger, and it is a waste of resources. The research and application of sludge treatment techno...

Examples

Embodiment 1

[0039] Using the device and process of the present invention, the municipal sludge with a concentration of 90% after desanding is continuously treated, and the treatment capacity is 15 tons / day. The parameters during the processing are set as follows:

[0040] 1) The sludge stock solution is lifted into the sludge regulating tank 1 by the pump, and at the same time, sodium hydroxide in the dosing device connected to the sludge regulating tank 1 is added to the sludge regulating tank 1, and mixed in the agitator 12 Under the action, the pH value of the sludge stock solution in the sludge adjustment tank 1 is adjusted to 8.5-9.0;

[0041] 2) The sludge liquid after pH adjustment is lifted into the heat exchanger 2 by the pump, and after heat exchange with the hot sludge liquid from the gas-liquid separator 3, it is lifted by the pump into the tubular hydrolysis reactor 4, The superficial linear velocity of the sludge in the tube 41 is controlled at 0.1m / s, and at the same time,...

Embodiment 2

[0047] Using the device and process of the present invention, the municipal sludge with a concentration of 90% after desanding is continuously treated, and the treatment capacity is 15 tons / day. The parameters during the processing are set as follows:

[0048] 1) The sludge stock solution is lifted into the sludge regulating tank 1 by the pump, and at the same time, sodium hydroxide in the dosing device connected to the sludge regulating tank 1 is added to the sludge regulating tank 1, and mixed in the agitator 12 Under the action, the pH value of the sludge stock solution in the sludge adjustment tank 1 is adjusted to 8.5-9.0;

[0049] 2) The sludge liquid after pH adjustment is lifted into the heat exchanger 2 by the pump, and after heat exchange with the hot sludge liquid from the gas-liquid separator 3, it is lifted by the pump into the tubular hydrolysis reactor 4, The superficial linear velocity of the sludge in the tube 41 is controlled at 0.2m / s. At the same time, hig...

Embodiment 3

[0055] Using the device and process of the present invention, the municipal sludge with a concentration of 95% after desanding is continuously treated, and the treatment capacity is 20 tons / day. The parameters during the processing are set as follows:

[0056] 1) The sludge stock solution is lifted into the sludge regulating tank 1 by the pump, and at the same time, sodium hydroxide in the dosing device connected to the sludge regulating tank 1 is added to the sludge regulating tank 1, and mixed in the agitator 12 Under the action, the pH value of the sludge stock solution in the sludge adjustment tank 1 is adjusted to 8.5-9.0;

[0057] 2) The sludge liquid after pH adjustment is lifted into the heat exchanger 2 by the pump, and after heat exchange with the hot sludge liquid from the gas-liquid separator 3, it is lifted by the pump into the tubular hydrolysis reactor 4, The superficial linear velocity of the sludge in the tubes 41 is controlled at 0.2m / s, and at the same time...

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