Biosolids

Biosolids are the nutrient-rich organic materials resulting from the treatment of domestic waste at a wastewater treatment facility. Through biosolids management, solid residue from wastewater treatment is processed to reduce or eliminate pathogens and minimize odors, forming a safe, beneficial agricultural product. Biosolids are carefully monitored and must be used in accordance with regulatory requirements


Biosolids resources:   Technical Documents
Communications Toolkit  |  WEF Resources   |   CASA Resources

  • NEWS

      Water resource recovery professionals have long understood that when processed correctly, fertilizers made by repurposing wastewater biosolids can often represent a safer, cheaper, and more sustainable soil amendment compared to manure or chemical-based fertilizers. However, while biosolids reuse in the U.S. has become more common in recent decades, its adoption has been sluggish because of inconsistent regulatory guidelines, gaps...

    • NEWS

        Objectives SB 1383, signed into law in September 2016, requires a 40% reduction in methane emissions in California by 2030 below the levels emitted in 2013. In order to achieve the methane emission reductions, the legislation further requires a 75% diversion of organics (including biosolids) from landfills by 2025, using 2014 levels as the baseline....

      • NEWS

          British researchers look at the dangers of working around raw sewage. They find SARS-CoV-2 is unlikely to be spread by sewage. “Overall, we conclude that while virus particles contained in respiratory droplets are known to be highly infectious, evidence suggests that feces and urine probably contain low levels to no infectious particles. In comparison to...

        • NEWS

            In recent years, PFAS has become a topic of public concern, particularly when found in water supplies. We in the water sector are also concerned about PFAS because protecting public health and the environment and increasing sustainability in our communities is our daily mission. The Water Environment Federation (WEF) and its members always prioritize science,...

          • NEWS

              Orange County Sanitation District’s new temperature-phased anaerobic digestion system to secure reliable biosolids management for the next 50 years The Orange County Sanitation District (OCSD) has engaged a team of Brown and Caldwell and Black & Veatch to deliver professional design services for a new temperature-phased anaerobic digestion (TPAD) facility at its Plant No. 2...

            • NEWS

                 Webinar Speaker Bios Moderator: Greg Kester, Director of Renewable Resource Programs, California Association of Sanitation Agencies Greg serves as both the technical and programmatic contact for CASA members and conduit for emerging issues on state and federal level on all biosolids, renewable energy, recycled water, and related issues. Prior to joining CASA, Greg served...

              • NEWS

                  Watch the recording of our September 2020 webinar with CalRecycle and the report authors > From the State Water Board… A new report issued today by the California Environmental Protection Agency shows that at least half of California’s landfill-bound food waste could be processed at the state’s wastewater treatment plants and serve as an innovative power source. Waste can be...

                • NEWS

                    Anaergia, Inc. is pleased to announce the successful issuing of bonds, as part of the funding of its Rialto Bioenergy Facility (RBF). A total of $117 million of tax exempt bonds were issued by the California Pollution Control Financing Authority for the RBF. This is a substantial portion of the $160 million of total capital...

                  • NEWS

                      Coverage of biosolids and co-digestion supported by Anaergia Construction Underway at California’s Sterling Natural Resource Center, Incorporating Fibracast’s Advanced Membranes and Anaergia’s Anaerobic Digestion System Anaergia Inc. and its sister company Fibracast Ltd. are pleased to announce that they have been added to the team selected for the construction of the Sterling Natural Resource Center (SNRC)...

                    • NEWS

                        Coverage of biosolids and co-digestion supported by Anaergia Already a leader in co-digestion of organic food wastes and FOG, the Central Marin Sanitation Agency (CMSA) is launching a new study to determine optimum feed rates of organic wastes to its anaerobic digesters. “The generally understood ratio of FOG to wastewater solids is around 30 to...

                      • NEWS

                          Coverage of biosolids and co-digestion supported by Anaergia Using digester biogas for co-generation is a growing feature of many California water resource recovery facilities. Fats, oil & grease (FOG) added to digesters super-charge the digestion process, boost biogas and increases the production of clean, green energy. That’s the theory. We talked with four California facilities...

                        • NEWS

                            Coverage of biosolids and co-digestion supported by Anaergia From the Petaluma360.com news website… It is said you can learn a lot about a person by looking at their garbage. Turns out, you can learn just as much about the character of Petaluma by looking at its sewage — or, thankfully, at the facility that processes...

                          • NEWS

                              News release from Lystek-Fairfield… As further validation of the market leading biosolids and organics management services being provided to municipal agencies in the San Francisco Bay area, Lystek International Ltd. (Lystek) is excited to announce that it has reached a Memorandum of Understanding (MOU) with the Vallejo Flood and Wastewater District (VFWD) to manage a portion of...

                            • NEWS

                                Video interview by Water World magazine. Black & Veatch’s Lynne Moss discusses the relationship between PFAS substances and biosolids.    

                              • NEWS

                                  BACKGROUND WEF Fact Sheet on Land Application and Composting of Biosolids (2010) CASA Biosolids Fact Sheet (2015) CASA Biosolids Fact Sheet – Spanish (2015) US Biosolids Program and 40 CFR Part 503  (2019) Land Application of Biosolids: Human Health Risk Assessment Related to Microconstituents (2017) Thermal Oxidation Fact Sheet (2014) Drying of Wastewater Solids (2014) Enabling the Future:  Advancing...

                                • NEWS

                                    Coverage of biosolids and co-digestion supported by Anaergia Anaergia, Inc. is pleased to announce the start of construction at the Rialto Bioenergy Facility (RBF) The RBF will help address two pressing waste management issues in Southern California: food waste diversion from landfills and biosolids management. The RBF will convert 700 tons per day of food...

                                  • NEWS

                                      According to Patrick Dube, Biosolids Program Manager for WEF, “Looking to learn more about greenhouse gas emissions from composting? You’re in luck as our GHG Subcommittee just released an awesome fact sheet on that topic! Check it out under the biosolids tab on our publications page!” Download the fact sheet here > “Breakdown of Organic...

                                    • NEWS

                                        Leading biosolids and organics solutions provider, Lystek International Ltd. (Lystek), is pleased to announce that it has been awarded multi-year, multi-million dollar contracts by the both the City of Benicia (Benicia) and the City of Palo Alto (Palo Alto) for Biosolids Management. The two agreements will see Lystek accept biosolids generated in both cities, converting them into LysteGro®,...

                                      • NEWS

                                          According to a Bay Area NBC report the  Bioforcetech demonstration facility at Silicon Valley Clean Water is producing biochar that is cheaper, safer and easier to manage. Biosolids are dried and made safe by using the heat given off from the bacteria growing in the biosolids. “Upcycling,” say Dario Presezzi, the chief executive officer at Bioforcetech. “We’re...

                                        • NEWS

                                            In preparation for CWEA’s Annual Conference 2018 next April in Sacramento our Educational Program Team completed an annual survey of members and executives from several wastewater agencies. We’re looking for the profession’s most important challenge areas so we can develop sessions at Annual Conference to help our members address them. If you have an idea...