# US 9,038,408 B2 · Wastewater effluent to geothermal heating

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- Number: US 9,038,408 B2
- Document ID: US9038408B2
- Status: Granted
- Kind: B2
- Application number: 14/175,769
- Filed: 2014-02-07
- Published: 2014-06-05
- Granted: 2015-05-26
- Earliest claimed: 2011-02-18
- Assignees: A.K. Industries, Inc.
- Applicants: A.K. Industries, Inc.
- Inventors: Stephen A Sabo
- Web page: https://patentgrep.com/patent/US9038408B2

## CPC

- F24T 10/20: using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
- C02F 3/1242: {Small compact installations for use in homes, apartment blocks, hotels or the like}
- C02F 3/288: {comprising septic tanks combined with a filter}
- F24T 10/10: with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T 10/30: using underground reservoirs for accumulating working fluids or intermediate fluids
- C02F 2209/005: Processes using a programmable logic controller [PLC]
- C02F 2209/40: Liquid flow rate
- C02F 2209/42: Liquid level
- Y02B 30/52: Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
- Y02E 10/10: Geothermal energy
- Y02W 10/10: Biological treatment of water, waste water, or sewage
- F24T: GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A wastewater geothermal heat system is supplied with processed wastewater through a drip field in proximity to a thermal array part of a geothermal heat pump system. The wastewater treatment system portion provides a periodic source of treated wastewater. Several sensors and a control system regulate a pump that discharges wastewater from the treatment system and enters a drip field where it is released into the surrounding soil. The dampened soil provides an efficient vehicle to transfer heat into or out of a thermal array which is positioned adjacent to the drip field such that it is in contact with the soil that is dampened by the discharged wastewater.

## Claims

### Claim 1

A geothermal heat system comprising:
a waste tank having a waste tank inlet for receiving wastewater from a wastewater source, said waste tank having a waste tank outlet;
a clarifying tank having a clarifying tank inlet and a clarifying tank outlet, said clarifying tank inlet for receiving wastewater from said waste tank outlet;
an aerator providing oxygen to said clarifying tank wherein aerobic decomposition of said wastewater is encouraged;
a holding tank having a holding tank inlet for receiving wastewater from said clarifying tank, said holding tank having a holding tank outlet and a level sensor for detecting the level of said wastewater in said holding tank;
a liquid pump for dispensing wastewater from said holding tank to said holding tank outlet;
a drip field in fluid communication with said holding tank outlet, said drip field having an inlet for receiving wastewater and an outlet for discharging said wastewater, a tube having perforations therethrough, providing fluid communication between said drip field inlet and said drip field outlet, said perforations in said tube discharging said wastewater, said drip field outlet discharging excess wastewater that is not discharged through said perforations;
a recycle line in unobstructed fluid communication between said outlet of said drip field and said geothermal heat system for returning said excess wastewater to said wastewater treatment system;
a heat-transferring array positioned below said drip field wherein said array is in thermal communication with said wastewater discharged through said perforations;
a heat pump in fluid communication with said heat-transferring array; and
a water sensor in said recycle line in electrical communication with a controller to indicate the presence of said excess wastewater from said drip field outlet.

### Claim 2

A wastewater geothermal heating and cooling system comprising:
a holding tank for receiving wastewater from a source, said tank having an inlet and an outlet;
a level sensor in said holding tank for determining the wastewater level in said holding tank;
a fluid pump having an inlet and an outlet, said inlet in fluid communication with said wastewater in said holding tank;
a drip field, in fluid communication with said outlet of said fluid pump, having an inlet for receiving wastewater, and an outlet and having a plurality of holes between said drip field inlet and said drip field outlet for discharging processed wastewater, wherein excess wastewater not discharged from said holes is discharged from said drip field outlet, and a return line connected to said drip field outlet, said return line in fluid communication with said holding tank in unobstructed flow for returning said excess wastewater to said holding tank;
a heat pump in fluid communication with a thermal transfer array and a heat exchanger, said thermal transfer array in thermal communication with said drip field;
a return line, in fluid communication with said outlet of said drip field and said holding tank, said return line having unrestricted flow between said outlet of said drip field and said holding tank;
a controller, in electrical communication said level sensor, said fluid pump, and said heat pump, said controller determining the rate of said wastewater into said drip field; and
a water sensor in said recycle line in electrical communication with said controller to indicate the presence of said excess wastewater from said drip field outlet.

### Claim 3 (depends on 2)

The wastewater geothermal heating and cooling system of claim 2, said controller using said sensors and pump to optimize the efficiency of said heating and cooling system.