Carollo Engineers is an environmental engineering firm specializingin the planning, design, and construction management of water and wastewaterfacilities for municipal and public sector clients in the United States. The firm is headquartered in Walnut Creek, California, and currently maintains 38 offices throughout the United States. Carollo has provided services to the City of Phoenix for over 80 years and to Southern California's Orange County Sanitation District for over 50 years.Carollo Engineers employs civil, structural, electrical, mechanical, environmental, and instrumentation and control engineers, as well as scientists, planners, architects, and CAD designers. Carollo offers water supply, treatment, and distribution engineering services; watershed and water resources planning; storm water and urban wet weather planning, permitting, and regulatory assistance; computer modeling, master planning, decision support analysis, and financial assistance services; and reuse studies. Carollo is also involved in planning and design of biogas cogeneration and standby power facilities for the water and wastewater industry; provides utility finance, business planning, asset management, infrastructure engineering, and water reclamationconstruction management services for public work facilities and industrial and private structures.The company’s projects include pilot and treatment studies, pump stations, pipelines, solids handling facilities, and reservoirs. It serves public agencies, private developers, and industrial firms. Carollo has offices in Los Angeles, San Francisco, San Diego, Pasadena, Sacramento, Walnut Creek, Fresno, Bakersfield, Fountain Valley, and Riverside, California; Las Vegas and Reno, Nevada; Phoenix and Yuma, Arizona; Portland, Oregon; Seattle, Washington; Boise, Idaho; Salt Lake City, Utah; Broomfield and Littleton, Colorado; Kansas City, Missouri; Chicago, Illinois; Oklahoma City, Oklahoma; Charlotte, North Carolina; Dallas, Houston, Fort Worth, and Austin, Texas; Boston, Massachusetts; and Miami, Tampa, Orlando, Sarasota, Palm Beach, and Hollywood, Florida.Carollo Engineers is a Regional Sponsor for Water For People, which helps developing countries improve their quality of life by supporting the development of locally sustainable drinking water resources, sanitation facilities, and health and hygiene education programs. Wikipedia.
Carollo Engineers | Date: 2017-08-02
A system and method for removing unwanted elements from a gas stream. A biogas stream (20) may be combined with a water stream influent (22) in a venturi device (30) to produce a gas-water mixture effluent (24). The gas-water mixture effluent (24) is processed in a degas separator (32) to separate and produce a relatively low solubility gas effluent (26) and a relatively high solubility gas-water mixture effluent (28). The relatively high solubility gas-water mixture effluent (28) is processed through a discharge pressure control valve (36) based on a selected pressure to be maintained in the degas separator (32) and then discharged or reused.
Carollo Engineers | Date: 2016-12-15
A System for brine treatment scaling control in a water treatment system is described. In the system, a concentrated brine stream influent may be treated in an electrodialysis-reversal process to produce a concentrated brine stream effluent and a lower salinity diluent water, which may be potable water effluent. The concentrated brine stream effluent may be processed in a brine treatment scaling control system that may have a mixing vessel and a membrane filter with the mixing vessel seeded with calcium sulfate. A lowered salinity brine stream effluent may be produced for return to the electrodialysis-reversal process to allow operation at greater overall recovery and an elevated concentrated brine stream may be produced.
Russell C.G.,Carollo Engineers |
Journal - American Water Works Association | Year: 2017
A prior assessment estimating the national compliance costs associated with perchlorate (Russell et al. 2009) was updated to account for utility actions taken in response to state regulations for perchlorate in California and Massachusetts. The updated cost assessment reinforces concern that the potential impacts of establishing a federal maximum contaminant level for perchlorate on individual systems are significant, particularly for small water systems. Estimated costs for systems serving a population of less than 500 are approximately $3/1,000 gal, representing a potential increase in annual household water bills of more than $500 for a family of four. Some impacted public water systems may avoid treatment costs by abandoning high-concentration sources. However, most of these systems will eventually incur costs to replace the lost water supply. This study demonstrates that opportunity costs for lost water (source abandonment) are comparable to treatment costs.
University of Michigan and Carollo Engineers | Date: 2010-07-21
A system and method for simultaneous biologically mediated removal of contaminants (including at least arsenic or nitrate) from water are disclosed herein. The system includes i) a bioreactor having a length suitable for housing at least three different microbial populations, or ii) two bioreactors coupled together, the two bioreactors each having a length and an empty bed contact time that together are suitable for housing at least three different microbial populations. The system also includes a biofilm attachment medium positioned in i) the bioreactor, or ii) the two bioreactors; and the at least three different microbial populations formed on the biofilm attachment medium. The microbial populations are selected from oxygen reducing microbes, nitrate reducing microbes, arsenate reducing microbes, sulfate reducing microbes, and uranium reducing microbes.
Baune D.,Carollo Engineers
Pipelines 2016: Out of Sight, Out of Mind, Not Out of Risk - Proceedings of the Pipelines 2016 Conference | Year: 2016
The Santa Clara Valley Water District (District) initiated the Penitencia delivery main and penitencia force main seismic retrofit project (Project) to improve the seismic resilience of three critical water supply/delivery pipelines that serve the District's Penitencia water treatment plant (WTP) in San Jose, California. The most important objective of the project was to retrofit the pipelines to protect the life-safety of nearby residents and the noble elementary school. The Project planning phase began in 2013 and final design was completed in December 2015. Construction is scheduled to start in April 2016 and is scheduled to be complete in December 2017. This project included the following key innovations: design for large landslide displacement: the landslide and seismic hazard evaluation estimated the landslide displacement as 7.7 feet (seismic) and 1.7 feet (creep) for a total displacement of 9.4 feet over the 50-year design life. sophisticated finite element modeling: The project team developed the design with a sophisticated 3-D model of the landslide and pipeline interactions. Full scale testing of joint and collar performance: Kubota Corporation performed a full-scale test of the 60-inch and 72-inch pipelines to verify the maximum rotation and moment capacities. Novel application of earthquake resistant ductile iron pipe: There have been a few pilot project installations of small diameter earthquake resistant ductile iron pipe (ERDIP) in the United States to date; however, the 60-inch, 66-inch, and 72-inch pipelines will be the first large diameter installation of ERDIP in the US. This project is unique because it required designing for a large displacement along the axis of pipelines which load the pipelines in compression. This project also has a high visibility within the community because of the risk of failure and proximity of the project within the residential neighborhood. © 2016 ASCE.
Carollo Engineers | Date: 2012-09-22
The systems may be used for treatment of water that contains contaminants. Water containing at least one of a nitrate, percholate, chromate, selenate and a volatile organic chemical is combined with nutrients and then is processed in an anoxic-anaerobic bioreactor. The combined effluent may also be oxygenated by dosing with hydrogen peroxide or liquid oxygen. The combined effluent of the bioreactor is dosed with a particle conditioning agent. The combined effluent treated water of the bioreactor is then filtered in a biofilter to produce a treated effluent stream. The influent water and combined effluent of the anoxic-anaerobic bioreactor may also be dosed with hydrogen peroxide to control biomass content in the system.
Carollo Engineers | Date: 2014-09-26
A system and method for removing unwanted elements from a gas stream. A biogas stream may be combined with a water stream influent in a venturi device to produce a gas-water mixture effluent. The gas-water mixture effluent is processed in a degas separator to separate and produce a relatively low solubility gas effluent and a relatively high solubility gas-water mixture effluent. The relatively high solubility gas-water mixture effluent is processed through a discharge pressure control valve based on a selected pressure to be maintained in said degas separator and then discharged or reused.
Carollo Engineers | Date: 2013-11-19
Water contaminant removal system comprising: a bioreactor, a biofilter, a backwash unit, dosing units, sensors and analyzers, and control units.
Carollo Engineers | Date: 2016-06-28
A system for treating a biogas stream is described. The system includes a venturi device in communication with a biogas stream source and an influent water source to combine the biogas stream and the influent water to produce a gas-water effluent. The system also includes a degas separator in communication with the venturi device for receipt of the gas-water effluent to produce a relatively low solubility gas effluent and a relatively high solubility gas-water mixture effluent. In addition, the system includes a gas-water pressure release valve in communication with the degas separator to control release of the relatively low solubility gas effluent and a discharge pressure control valve in communication with the degas separator to control release of the relatively high solubility gas-water mixture effluent.
Steinle-Darling E.,Carollo Engineers
Journal - American Water Works Association | Year: 2015
The Texas Commission on Environmental Quality (TCEQ) regulates public health and environment in Texas, including all aspects of wastewater treatment and disposal, and water supply and treatment as part of its mission statement aimed at protecting the state's public health and natural resources consistent with economic development. The TCEQ has been approving direct potable reuse (DPR) projects on a case-by-case basis in accordance with an innovative/alternative treatment clause in state regulations (30 TAC 290) that allows any treatment process that does not have specific design requirements. The TCEQ regulates DPR as a special type of raw water source mainly under existing drinking water regulations.