Biosolids EMS
City of Los Angeles Home
Managing Our Biosolids
Land Application: Green Acres Farms
Composting: Griffith Park Compost Facility
Deep Well Injection: T.I.R.E.
Other Options and Proposals


you should know...

We are preparing for our annual audit and invite you to participate in the process. You may participate by reviewing and commenting on the draft scope of work, being interviewed as an interested party, observing the audit, or reviewing the final results.  If you would like to be involved in the audit process please contact us at the information included below. We value your comments and look forward to hearing from you. Click here to view audit scope.

Composting: Griffith Park Compost Facility

Composting is the process by which organic materials such as biosolids are decomposed into a nutrient-rich soil conditioner. There are three primary composting methods, all of which produce a safe, high quality product:

  • Windrow composting takes place in linear piles as organic material is blended, then turned at regular intervals to provide aeration. This is the simplest compost process, having the lowest level of process control and requiring very little inputs (e.g. electricity, etc.).
  • In Aerated Static Pile (ASP) composting, piles of blended organic waste materials remain stationary throughout the process and are aerated by a circulation system. ASP composting offers more process controls than windrow composting, reducing stabilization time and land area required for a site. Process air pulled through the active composting piles can be directed to odor control equipment such as a biofilter.
  • In-vessel composting processes use an automated, fully enclosed system that mechanically agitates and aerates blended organic materials in concrete bays. In-vessel composting features maximum process control and is generally preferred where site selection dictates maximum odor control and where weather conditions warrant an indoor composting process.

The City produces a compost product at the Griffith Park Compost Facility. Click the links below to find out more about the facility.

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