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Last modified
12/9/2015 1:54:24 PM
Creation date
10/1/2015 5:41:01 AM
Metadata
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Template:
Official Documents
Official Document Type
Agreement
Approved Date
10/22/2013
Control Number
2013-210
Agenda Item Number
8.J.
Entity Name
Department of Environmental Projection
Subject
Amendment #1 to DEP Agreement G0353
PC South Algal Nutrient Removal Facility
Supplemental fields
SmeadsoftID
12559
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PROJECT OVERVIEW : <br /> This facility will be the second full-scale facility of its kind in Indian River County and the <br /> nation . Through <br /> engineered design and flow control, high levels of biomass productivity can be maintained. Predictable <br /> nitrogen and <br /> phosphorus removal results from the routine recovery of excess productivity . Several Best Management Practice ( BMP)s are <br /> used for this project : primary screening using self-cleaning trash rakes ; grit/sediment removal ; biological nutrient removal <br /> using the algal nutrient removal facility ; additional suspended solids removal using micro-screening or other highly efficient <br /> screens ; final effluent polishing using high quality wetland systems ; and disinfection of effluent used for irrigation <br /> reuse . <br /> Additionally, the harvested algal biomass is a useful byproduct . Recovered biomass is processed into <br /> marketable end <br /> products including high grade compost or livestock feed . <br /> An AGNRF system will remove dissolved nutrients from up to 10 million gallons per day of stormwater and canal <br /> water and from up to 1 . 5 million gallons per day of reverse osmosis reject water from the South County Reverse <br /> Osmosis <br /> ( RO) Treatment Plant. The RO reject water (currently discharged into the South Relief Canal untreated) will be blended with <br /> the canal water and the ANRF will remove dissolved nitrogen and phosphorus from the blended water. Hydrogen sulfide <br /> present in the RO reject water will be dissipated into the atmosphere as the mixture flows over the ANRF surface . The treated <br /> water will be returned to the South Relief Canal where it will continue its journey to the IRL . <br /> The ANRF uses a patented water treatment technology developed specifically to enhance water quality of polluted <br /> waters through the active cultivation of attached algae upon an engineered surface . By cultivation is meant the production <br /> and periodic harvesting of the attached algae (epiphytic and periphytic) and the community of organisms <br /> that become <br /> established on and around the algae . This living community of plants and organisms is known as algal turf and includes <br /> not <br /> only the algal biomass, but also associated invertebrates , bacteria, fungi, organic residues, and <br />inorganic precipitants . <br /> Through the community ' s biological and chemical dynamics , nutrient pollutants are removed from the water <br /> column, <br /> dissolved oxygen is increased, and oxidation of reduced substances is facilitated. The result is a treated effluent reduced <br /> in <br /> nutrients, high in dissolved oxygen, and relieved of many potentially biologically deleterious and toxic substances . One <br /> or <br /> more final polishing filters, similar to wastewater treatment type filters, will be included in the treatment train downstream <br /> of <br /> the ANRF to remove all remaining solid particles from the treated water and a linear wetland system <br />will provide final <br /> polishing. <br /> The Algal Nutrient Removal Facility offers the advantage of high areal removal rates for both <br /> nitrogen and <br /> phosphorus, which result in reduced land area requirements and treatment costs . ' Effluent from the ANRF process is highly <br /> oxygenated, often exceeding saturation during the daytime, and typically well above 5 mg/I dissolved oxygen ( DO) during <br /> the nighttime . ANRF units have relatively short hydraulic detention, and thereby avoid accumulation of heavy sediment <br /> loads . As algae rely heavily upon dissolved bicarbonate, carbon dioxide and carbonate as a carbon source, pH levels within <br /> the ANRF effluent can increase during the daytime as alkalinity shifts towards hydroxyl alkalinity . This change <br /> in water <br /> chemistry allows engineered ANRF systems to be optimized for the precipitation and recovery of pollutants <br /> including <br /> phosphorus . ANRF units have also been shown to be effective at removing ammonia and nitrate + nitrite <br />nitrogen ; and <br /> recovering trace metals and select organic compounds . The ANRF technology was specifically developed to offer low cost <br /> treatment even under low nitrogen and phosphorus conditions . <br /> PC South will greatly improve the IRL ' s health by significantly removing suspended solids and dissolved nitrogen <br /> and phosphorus from the waters of the IRFWCD South Relief Canal before the waters enter the IRL , while increasing oxygen <br /> levels . This will benefit and protect seagrasses and associated fauna, providing them with an environment suitable for their <br /> growth and reproduction . As seagrasses are preserved and proliferate, fish and wildlife populations will increase <br />. The <br /> potential for dangerous IRL algal blooms, including macroalgae such as Gracilaria sp. , caused by high nutrient loadings <br /> will <br /> also be greatly reduced . A secondary (future) benefit will be the creation of a significant source of treated water for irrigation <br /> purposes for commercial , industrial, and residential users, thus lowering their consumption of water from the surficial <br /> and <br /> Floridian aquifiers, thereby promoting water conservation and preserving groundwater. This will also benefit the IRL <br /> by <br /> reducing the quantity of freshwater discharged into it on a daily basis . Another benefit is the creation of very <br /> high quality <br /> 1 For example, STA systems may achieve phosphorus removal rates of 1 -4 g- P/m2-yr or less than 0 . 10 lb- P/acre-day ; WH STM <br /> units at high nutrient concentrations may achieve as high as 25 g- P/m2-yr removal or about 0 . 62 <br /> lb- P/acre-day ; ANRF <br /> systems at comparatively low nutrient concentrations have been documented as achieving well over 50 g- P/m2-yr or 1 .24 <br /> Ib- <br /> P/acre-day . The implication is that an ANRF unit may provide treatment in 1 acre equivalent to 50 acres of STA or treatment <br /> wetlands . <br /> DEP Agreement No . G0353 , Attachment A- 1 , Page 2 of 14 <br />
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