covered ASP system

Compost Facility Case Studies: Comparison of Covered ASP to Hybrid Systems

February 22, 2022




Landfills, Solid Waste Departments, municipalities, and agencies all work toward achieving waste diversion goals and lowering carbon footprints. Greg McCarron and Vidhya Viswanathan discuss managing tons of food scraps and other organic materials using different compost approaches in our February forum.

Greg and Vidhya answered your questions about these different systems as they covered the technology, best practices, permitting, odor management, business planning, and financing for sustainable operations.


Mr. McCarron, PE, is a Vice President of SCS Engineers and our National Expert on Organics Management. He has over 35 years of progressively responsible experience in solid waste management, including composting, solid waste planning, waste-to-energy systems, landfill design, and landfill gas systems. His expertise is in designing, permitting, constructing, and operating compost systems and facilities for public and private clients.

Ms. Viswanathan, PE, is a Vice President with over 15 years of experience in solid waste engineering and infrastructure design projects. She is the Director of Engineering of our Southwest Region, where she leads our solid waste engineering operations. Her comprehensive experience includes preparing feasibility studies and the permitting, design, construction, and CQA of composting operations, landfill gas systems, and liquids management.

Watch Here


This educational, non-commercial webinar with a Q&A forum throughout is free and open to all who want to learn more about composting. We recommend this month’s discussion for solid waste operators and facility supervisors, landfill owners, environmental engineers, agency staff, and municipal personnel interested in finding sustainable options for managing organic materials.





Posted by Diane Samuels at 2:00 pm

ASP Composting Program Allows a Facility to Test Before Invest

July 22, 2020

SCS Engineers launched a successful new program enabling waste managers and facilities to pilot test Aerated Static Pile (ASP) composting before making a capital investment. There is a high interest in organic materials management (e.g., composting, anaerobic digestion), driven by state and local regulations for diversion of organics from disposal facilities and the desire to reduce carbon emissions.

The organic fraction of any waste stream is successfully compostable, including materials, such as food scraps, yard trimmings, food processing by-products, and biosolids. The organic fraction of the municipal waste stream, which includes food scraps, is about 30 percent by weight, so it is possible to divert a significant amount from landfilling. SCS helps waste managers evaluate their organic waste streams and whether composting is a viable solution for their circumstances. ASP composting is often the preferred method because it is fast, cost-efficient, and controls odors and emissions effectively.

SCS owns a covered ASP compost system that is mobile and can be set-up on sites within an area of 50 feet by 100 feet, or less. In the covered ASP compost system, process and odor control is pro-active with a shorter composting period. A pilot test allows waste managers to assess composting and to see if it is the right fit for their situation. The ASP system processes material batches in two months. Additional batches or “recipes” can test in 2-month intervals.

SCS’ services include the setup and operation of the mobile ASP system. The system can compost up to 50 tons of targeted material per batch. SCS provides all equipment and consulting services, along with the test reports with the process and lab data. The resulting report and data are useful information to supplement a feasibility study (e.g., the quality of the end-products for sale or community use).

Greg McCarron of SCS Engineers comments, “Virtually every town can develop and support a compost program that is locally based and directly beneficial to their community. Our mobile ASP system can provide proof of concept for our clients and the information that allows managers to make informed decisions.”

Covered ASP Pilot Program details.







Posted by Diane Samuels at 6:00 am