A comprehensive utilization system and method of heat energy in a sewage treatment station

Abstract

The present invention provides a comprehensive utilization system and method of heat energy in a sewage treatment station, comprising a circulating insulated water tank, a circulating water pump, a biological trickling filter, a contact oxidation pool, and heat exchangers respectively arranged on the biological trickling filter and the contact oxidation pool, wherein the circulating insulated water tank is connected to a steam input pipeline, and the steam input pipeline is provided with a pressure reducing valve, a one-way valve and a solenoid valve in sequence from the steam entry direction, and a thermostat is provided on the solenoid valve, and the thermostat is connected to a thermocouple inside the circulating insulated water tank; the circulating water pump is connected to a hot water output pipeline, and the hot water in the circulating insulated water tank is pumped to the heat exchanger of the biological trickling filter and the heat exchanger of the contact oxidation pool through two branch pipes of a three-way pipe, and then the wastewater in the biological trickling filter and the contact oxidation pool is heated respectively, and the water after the heat exchange is returned to the circulating insulated water tank through two return pipes. The present invention utilizes circulating water to ensure the treatment efficiency of microorganisms, reduce waste generation, and achieve green environmental protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a system and method for comprehensive utilization of heat energy in a sewage treatment station. Background Art

[0002] Biological treatment technology for wastewater and waste gas treatment is favored by people for its significant advantages such as low consumption, high efficiency, low cost, convenient and reliable process operation and management, and no secondary pollution. Most of the microorganisms in sewage treatment are suitable for growth between 15 and 35 degrees Celsius, and the treatment effect is good. However, in winter, the temperature in northern my country is low and the biological activity is very poor, which restricts the efficiency of wastewater and waste gas treatment. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a comprehensive thermal energy utilization system for a sewage treatment station.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A comprehensive utilization system of heat energy in a sewage treatment station comprises: a circulating heat-insulating water tank, a circulating water pump, a biological trickling filter, a contact oxidation tank, and heat exchangers respectively arranged on the biological trickling filter and the contact oxidation tank.

[0006] The circulating insulation water tank is connected with a steam input pipe, a hot water output pipe, an exhaust pipe and two return pipes.

[0007] The steam input pipeline is provided with a pressure reducing valve, a one-way valve and a solenoid valve in the order from the steam entry direction. The solenoid valve is provided with a thermostat, which is connected to the thermocouple inside the circulating insulation water tank.

[0008] The circulating water pump is connected to the hot water output pipeline, and the hot water in the circulating insulation water tank is pumped to the heat exchanger of the bio-trickling filter tower and the heat exchanger of the contact oxidation tank through the two branch pipes of the three-way pipe respectively;

[0009] The heat exchanger of the bio-trickling filter and the heat exchanger of the contact oxidation pool heat the wastewater in the bio-trickling filter and the contact oxidation pool respectively. The water that has completed the heat exchange is returned to the circulating insulation water tank through two return pipes.

[0010] An exhaust valve is provided on the exhaust pipe.

[0011] Furthermore, the circulating thermal insulation water tank is insulated with aluminum silicate.

[0012] Furthermore, a one-way valve is installed at the output end of the circulating water pump to prevent the wastewater in the contact oxidation tank and the biological trickling filter from flowing back through the hot water output pipe.

[0013] Furthermore, manual valves are respectively provided on two branch pipes of the three-way pipe connected to the heat exchanger of the biotrickling filter and the heat exchanger of the contact oxidation tank.

[0014] Furthermore, the steam pressure input into the steam input pipeline is 0.4 MPa~0.8 MPa.

[0015] Furthermore, the pressure reducing valve uses an adjustable pressure reducing valve, and the pressure is controlled at 0.2MPa.

[0016] A method for comprehensive utilization of heat energy in a sewage treatment station comprises the following steps:

[0017] (1) Steam pressure reduction: Use an adjustable pressure reducing valve, which controls the steam pressure of 0.4 MPa~0.8 MPa to 0.2 MPa;

[0018] (2) Circulating water heating: The thermocouple and temperature controller equipped in the circulating insulation water tank work. If the water temperature is lower than 70℃, the solenoid valve opens and steam flows in. If the water temperature is higher than 70℃, the solenoid valve closes and the steam flows in. The gas is discharged from the exhaust valve.

[0019] (3) Hot water transportation: The circulating water pump is turned on, and the hot water that meets the set temperature conditions is pumped to the heat exchanger of the biotrickling filter and the heat exchanger of the contact oxidation tank, respectively, and heat exchange is completed to heat the wastewater in the contact oxidation tank and the biotrickling filter;

[0020] (4) Heating: hot water is continuously delivered. When the temperature in the circulating insulation water tank is lower than 15°C, the solenoid valve opens and the circulating water pump starts. When the temperature is higher than 30°C, the solenoid valve closes and the circulating water pump shuts down. A one-way valve is installed after the circulating water pump to prevent wastewater from flowing back into the contact oxidation pond and the biotrickling filter.

[0021] (5) Pigment and paint residue drying: The heat radiated from the circulating insulated water tank is used to dry environmentally friendly water-based paint pigment residue, which is then crushed and ground for recycling.

[0022] Beneficial effects: The present invention utilizes circulating water in a circulating heat-insulated water tank, controls steam heating and the operation of a circulating water pump through a thermostat, a solenoid valve, etc., and uses hot water to heat wastewater in a contact oxidation tank and a biological trickling filter through a heat exchanger, thereby ensuring the treatment efficiency of microorganisms, and at the same time utilizes the heat of the water tank body to heat environmentally friendly water-based paint pigment residues, which are then crushed and recycled after drying. The present invention uses a comprehensive utilization system of heat energy in a sewage treatment station to ensure the treatment efficiency of wastewater and waste gas in the sewage treatment station, while recycling pigment residues, thereby ensuring the normal operation of the environmentally friendly water-based paint production line in winter, further reducing waste generation, and achieving green environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flowchart of the preparation process of the present invention. DETAILED DESCRIPTION

[0024] The present invention is described below with reference to specific examples. It will be appreciated by those skilled in the art that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention in any way.

[0025] A comprehensive utilization system of heat energy in a sewage treatment station, such as Figure 1 As shown, it includes: a circulating heat-insulating water tank, a circulating water pump, a biological trickling filter, a contact oxidation tank, and heat exchangers respectively arranged on the biological trickling filter and the contact oxidation tank.

[0026] The circulating insulation water tank is connected with a steam input pipe, a hot water output pipe, an exhaust pipe and two return pipes.

[0027] The steam input pipeline is provided with a pressure reducing valve, a one-way valve and a solenoid valve in the order from the steam entry direction. The solenoid valve is provided with a thermostat, which is connected to the thermocouple inside the circulating insulation water tank.

[0028] The circulating water pump is connected to the hot water output pipeline, and the hot water in the circulating insulation water tank is pumped to the heat exchanger of the bio-trickling filter and the heat exchanger of the contact oxidation tank through the two branch pipes of the three-way pipe respectively; a one-way valve is installed at the output end of the circulating water pump to prevent the wastewater in the contact oxidation tank and the bio-trickling filter from flowing back through the hot water output pipeline;

[0029] The heat exchanger of the bio-trickling filter and the heat exchanger of the contact oxidation tank heat the wastewater in the bio-trickling filter and the contact oxidation tank respectively. The water that has completed the heat exchange is returned to the circulating insulation water tank through two return pipes. Manual valves are respectively provided on the two branch pipes of the three-way pipe connected to the heat exchanger of the bio-trickling filter and the heat exchanger of the contact oxidation tank; an exhaust valve is provided on the exhaust pipe.

[0030] Among them, the circulating insulated water tank is insulated with aluminum silicate.

[0031] A method for comprehensive utilization of heat energy in a sewage treatment station comprises the following steps:

[0032] (1) Steam pressure reduction: Use an adjustable pressure reducing valve, which controls the steam pressure of 0.4 MPa~0.8 MPa to 0.2 MPa;

[0033] (2) Circulating water heating: The thermocouple and temperature controller equipped in the circulating insulation water tank work. If the water temperature is lower than 70℃, the solenoid valve opens and steam flows in. If the water temperature is higher than 70℃, the solenoid valve closes and the steam flows in. The gas is discharged from the exhaust valve.

[0034] (3) Hot water transportation: The circulating water pump is turned on, and the hot water that meets the set temperature conditions is pumped to the heat exchanger of the biotrickling filter and the heat exchanger of the contact oxidation tank, respectively, and heat exchange is completed to heat the wastewater in the contact oxidation tank and the biotrickling filter;

[0035] (4) Heating: hot water is continuously delivered. When the temperature in the circulating insulation water tank is lower than 15°C, the solenoid valve opens and the circulating water pump starts. When the temperature is higher than 30°C, the solenoid valve closes and the circulating water pump shuts down. A one-way valve is installed after the circulating water pump to prevent wastewater from flowing back into the contact oxidation pond and the biotrickling filter.

[0036] (5) Pigment and paint residue drying: The heat radiated from the circulating insulated water tank is used to dry environmentally friendly water-based paint pigment residue, which is then crushed and ground for recycling.

Claims

1. A method for comprehensive utilization of heat energy in a sewage treatment plant, characterized in that: The method is implemented through a comprehensive utilization system of heat energy in a sewage treatment station, the system comprising: a circulating insulated water tank, a circulating water pump, a biotrickling filter, a contact oxidation tank, and heat exchangers respectively arranged on the biotrickling filter and the contact oxidation tank, the circulating insulated water tank being connected with a steam input pipeline, a hot water output pipeline, an exhaust pipeline and two return water pipelines, the steam input pipeline being provided with a pressure reducing valve, a one-way valve and a solenoid valve in sequence from the steam entry direction, the solenoid valve being provided with a thermostat, the thermostat being connected with a thermocouple inside the circulating insulated water tank; the circulating water pump being connected with the hot water output pipeline, pumping the hot water in the circulating insulated water tank through two branch pipelines of a three-way pipeline to the heat exchanger of the biotrickling filter and the heat exchanger of the contact oxidation tank respectively; the heat exchanger of the biotrickling filter and the heat exchanger of the contact oxidation tank respectively heat the wastewater in the biotrickling filter and the contact oxidation tank, and the water after the heat exchange is respectively returned to the circulating insulated water tank through two return water pipelines, An exhaust valve is provided on the exhaust pipe; the circulating heat-insulating water tank is insulated with aluminum silicate; a one-way valve is installed at the output end of the circulating water pump to prevent the wastewater in the contact oxidation tank and the biological trickling filter from flowing back from the hot water output pipe; manual valves are respectively provided on the two branch pipes of the three-way pipe connected to the heat exchanger of the biological trickling filter and the heat exchanger of the contact oxidation tank; the steam pressure input in the steam input pipe is 0.4 MPa~0.8 MPa; the pressure reducing valve uses an adjustable pressure reducing valve, and the pressure is controlled at 0.2MPa; The method comprises the steps of: (1) Steam pressure reduction: Use an adjustable pressure reducing valve, which controls the steam pressure of 0.4 MPa~0.8 MPa to 0.2 MPa; (2) Circulating water heating: The thermocouple and temperature controller equipped in the circulating insulation water tank work. If the water temperature is lower than 70℃, the solenoid valve opens and steam flows in. If the water temperature is higher than 70℃, the solenoid valve closes and the steam flows in. The gas is discharged from the exhaust valve. (3) Hot water transportation: The circulating water pump is turned on, and the hot water that meets the set temperature conditions is pumped to the heat exchanger of the biotrickling filter and the heat exchanger of the contact oxidation tank, respectively, and heat exchange is completed to heat the wastewater in the contact oxidation tank and the biotrickling filter; (4) Heating: hot water is continuously delivered. When the temperature in the circulating insulation water tank is lower than 15°C, the solenoid valve opens and the circulating water pump starts. When the temperature is higher than 30°C, the solenoid valve closes and the circulating water pump shuts down. A one-way valve is installed after the circulating water pump to prevent wastewater from flowing back into the contact oxidation pond and the biotrickling filter. (5) Pigment and paint residue drying: The heat radiated from the circulating insulated water tank is used to dry environmentally friendly water-based paint pigment residue, which is then crushed and ground for recycling.

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