"New" Gribbins Whirlair Aeration Unit for Spray and Direct Discharge Operations

Discharge of wastewater to the land by spray or direct disposal requires pretreatment of the wastewater:

1. to prevent the public from contamination by microbial pathogens in the aerosol spray or direct discharge.

2. to avoid clogging of the spray equipment or directional piping by wastewater solids.

3. to avoid clogging of the soil surface by wastewater solids.

To meet these objectives, the wastewater should be pretreated to remove a high percent of solids and to disinfect microbial pathogens. A buffer zone should also be provided to protect on-site and off-property activities from potential microbial pathogens.

The advantages of the land disposal system is its use for tracts of land where soil and/or solid rock completely prohibits lateral fields and its elimination of wastewater directly to the stream or the groundwater of buffer zones to prevent direct or indirect contact with the sprayed aerosols.

Pretreatment:
Pretreatment of wastewater for land disposal requires primary settling, secondary aeration and chlorination. The "New" Gribbins Whirlair Aeration Unit provides these pretreatment requirements.

Transmission of Wastewater:
The transmission of wastewater from the house to the pretreatment system and from the pretreatment system to the land application area should be planned to assure that wastewater does not back up into the basement, that sewers are below the freeze line, an that the pretreatment system is located away from the house. The storage or overflow units should be designed to handle flows during freeze periods or spray system breakdowns.

Land Applications and Buffer Zones:
The land application for spray will vary, however, a flat area (0 - 6% slope) is best for adequate detention time. Buffer zones around the land application area are necessary to prevent microbial pathogens from affecting the homeowner or nearby activities, and also to dilute potential runoff from the land application area to a nearby creek.

Other Topics:
Aeration Systems - Do's & Don'ts | Alternative Household Cleaning Solutions | Common Onsite Regulations | Engineering and Design for Difficult Sites | Fill & Wait - Why? What? How? | Health Departments - Friends or Foe? | Improve Your System Practice Water Conservation | Potential Home Owners Reference | Potential Property Owners Reference | Septic Tank Additives Danger in Disguise | Ten Most Asked Questions About Septic Systems | Sewage Protection Program

Barrow Company specializes in the engineering and design of all types of systems. If you would like additional information on these or any other system, please use the Contact Us section on this website, e-mail us at info@barrowcompany.com or contact us by telephone or fax. Office hours are 7:30 a.m. to 4:30 p.m. Monday thru Friday