Arcata Wastewater Treatment Plant and Wildlife Sanctuary is an innovative sewer

management system A management system is a set of policy, policies, business process, processes and procedures used by an organization to ensure that it can fulfill the tasks required to achieve its objectives. These objectives cover many aspects of the organizati ...

employed by the city of

Arcata, California Arcata (; ; ) is a city adjacent to the Arcata Bay (northern) portion of Humboldt Bay (United States), Humboldt Bay in Humboldt County, California, United States. At the 2010 United States Census, 2020 census, Arcata's population was 18,857. A ...

. A series of oxidation ponds, treatment wetlands and enhancement

marshes In ecology, a marsh is a wetland that is dominated by herbaceous plants rather than by woody plants.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p More in general ...

are used to filter sewage waste. The marshes also serve as a

wildlife refuge A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, funga, or features of geolog ...

, and are on the

Pacific Flyway The Pacific Flyway is a major north-south flyway for migratory birds in the Americas, extending from Alaska to Patagonia. Every year, migratory birds travel some or all of this distance both in spring and in fall, following food sources, heading ...

. The Arcata Marsh is a popular destination for birders. The marsh has been awarded the Innovations in Government award from the

Ford Foundation The Ford Foundation is an American private foundation with the stated goal of advancing human welfare. Created in 1936 by Edsel Ford and his father Henry Ford, it was originally funded by a $25,000 (about $550,000 in 2023) gift from Edsel Ford. ...

Harvard Kennedy School The John F. Kennedy School of Government, commonly referred to as Harvard Kennedy School (HKS), is the school of public policy of Harvard University, a private university in Cambridge, Massachusetts. Harvard Kennedy School offers master's de ...

. Numerous holding pools in the marsh, called "lakes," are named after donors and citizens who helped start the marsh project, including

Cal Poly Humboldt California State Polytechnic University, Humboldt (Cal Poly Humboldt or Humboldt) is a public university in Arcata, California. It is one of three polytechnic universities in the California State University (CSU) system and the northernmost c ...

professors George Allen and Robert A. Gearheart who were instrumental in the creation of the Arcata Marsh. In 1969 Allen also started an aquaculture project at the marsh to raise salmonids in mixtures of sea water and partially treated wastewater. Despite being effectively a sewer, the series of open-air lakes do not have an odor, and are a popular destination for

birdwatching Birdwatching, or birding, is the observing of birds, either as a recreational activity or as a form of citizen science. A birdwatcher may observe by using their naked eye, by using a visual enhancement device such as binoculars or a telescop ...

cycling Cycling, also known as bicycling or biking, is the activity of riding a bicycle or other types of pedal-driven human-powered vehicles such as balance bikes, unicycles, tricycles, and quadricycles. Cycling is practised around the world fo ...

and

jogging Jogging is a form of trotting or running at a slow or leisurely pace. The main intention is to increase physical fitness with less stress on the body than from faster running but more than walking, or to maintain a steady speed for longer periods ...

Sewage treatment

The

sewage treatment Sewage treatment is a type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable to discharge to the surrounding environment or an intended reuse application, thereby preventing water p ...

process takes place in stages: #

Primary Treatment Sewage treatment is a type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable to discharge to the surrounding environment or an intended reuse application, thereby preventing water p ...

(completed in 1949): Sewage is held in sedimentation tanks where the sludge is removed and processed for use as fertilizer. #

Secondary Treatment Secondary treatment (mostly biological wastewater treatment) is the removal of Biodegradation, biodegradable organic matter (in solution or suspension) from sewage or similar kinds of wastewater. The aim is to achieve a certain degree of effluent ...

(completed in 1957): Primary effluent is pumped into oxidation ponds (here bacteria break down the waste). #Disinfection (completed in 1966): Secondary effluent is chlorinated to kill

pathogen In biology, a pathogen (, "suffering", "passion" and , "producer of"), in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a Germ theory of d ...

s and dechlorinated to avoid damage to natural environments. # Tertiary Treatment (competed in 1986): Disinfected secondary effluent is put into artificial marshes where it is cleansed by reeds, cattails, and bacteria. #Disinfection: Tertiary effluent is chlorinated to kill pathogens from bird droppings and dechlorinated to avoid damage to natural environments.Oppelt, E. Timothy ''Manual: Constructed Wetlands Treatment of Municipal Wastewaters'' (2000) United States Environmental Protection Agency pp.18,61&139

Treatment and enhancement

Sewage from the city of Arcata is treated and released to

Humboldt Bay Humboldt Bay (Wiyot language, Wiyot: ''Wigi'') is a natural bay and a multi-basin, bar-built coastal lagoon located on the rugged North Coast (California), North Coast of California, entirely within Humboldt County, California, Humboldt County, ...

via complex flow routing through a number of contiguous ponds, wetlands, and marshes. Resemblance of treatment features to natural bay environments may cause potential ambiguity about where wastewater ceases to be considered partially treated sewage and meets enhancement objectives of the

California Bays and Estuaries Policy California () is a state in the Western United States that lies on the Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares an international border with the Mexican state of Baja California to the sout ...

. The wastewater treatment system includes both treatment wetlands and enhancement marshes. Treatment wetlands improve oxidation pond effluent quality to meet the federal definition of

secondary treatment Secondary treatment (mostly biological wastewater treatment) is the removal of Biodegradation, biodegradable organic matter (in solution or suspension) from sewage or similar kinds of wastewater. The aim is to achieve a certain degree of effluent ...

. Disinfection and dechlorination is the final step of the wastewater treatment process. Disinfected wastewater may be discharged either to Humboldt Bay or to enhancement marshes. Enhancement marshes purify the wastewater and provide wetland habitat. Enhancement marsh effluent is disinfected to improve

coliform index The coliform index is a rating of the purity of water based on a count of fecal bacteria. It is one of many tests done to assure sufficient water quality. Coliform bacteria are microorganisms that primarily originate in the intestines of warm-blo ...

changes from birds using tertiary treatment enhancement marsh habitat. After leaving the treatment wetlands the effluent is mixed with water returning from the enhancement marshes. Wild bird

feces Feces (also known as faeces American and British English spelling differences#ae and oe, or fæces; : faex) are the solid or semi-solid remains of food that was not digested in the small intestine, and has been broken down by bacteria in the ...

contain

coliform bacteria Coliform bacteria are defined as either motile or non-motile Gram-negative non- spore forming bacilli that possess β-galactosidase to produce acids and gases under their optimal growth temperature of 35–37 °C. They can be aerobes or ...

similar to those found in human sewage. Recreational access is limited to areas where effluent has received secondary treatment and disinfection.

Conventional pollutants or wetland detritus

Wetland plants use the energy of sunlight to produce five to ten times as much carbohydrate biomass per acre as a

wheat Wheat is a group of wild and crop domestication, domesticated Poaceae, grasses of the genus ''Triticum'' (). They are Agriculture, cultivated for their cereal grains, which are staple foods around the world. Well-known Taxonomy of wheat, whe ...

field.

Detritus In biology, detritus ( or ) is organic matter made up of the decomposition, decomposing remains of organisms and plants, and also of feces. Detritus usually hosts communities of microorganisms that colonize and decomposition, decompose (Reminera ...

from decomposing wetlands vegetation forms the base of a

food chain A food chain is a linear network of links in a food web, often starting with an autotroph (such as grass or algae), also called a producer, and typically ending at an apex predator (such as grizzly bears or killer whales), detritivore (such as ...

for aquatic organisms, birds and

mammal A mammal () is a vertebrate animal of the Class (biology), class Mammalia (). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three ...

s. Individuals who value wetland environments may not realize the effluent characteristics necessary for release of treated wastewater to Humboldt Bay. Although there is no evidence of harm to wildlife, some regulators suggest potential risk to wildlife using treatment wetlands because of an absence of significant research on wildlife exposure to partially treated effluent and to potential accumulation of chemicals being removed from effluent in wetland treatment processes. Ongoing research at

minimizes potential risk to Humboldt Bay wetlands and wildlife. The City of Arcata generates an average volume of of sewage per day. Winter rainfall onto treatment ponds and marshes increases the volume of effluent discharged from the wetland treatment system to as much as per day.

National Pollutant Discharge Elimination System The Clean Water Act (CWA) is the primary federal law in the United States governing water pollution. Its objective is to restore and maintain the chemical, physical, and biological integrity of the nation's waters; recognizing the primary respo ...

regulations require monthly average effluent concentrations of

biochemical oxygen demand Biochemical oxygen demand (also known as BOD or biological oxygen demand) is an analytical parameter representing the amount of dissolved oxygen (DO) consumed by aerobic bacteria growing on the organic material present in a water sample at a s ...

and of

total suspended solids Total suspended solids (TSS) is the dry-weight of suspended particles, that are not dissolved, in a sample of water that can be trapped by a filter that is analyzed using a filtration apparatus known as sintered glass crucible. TSS is a water qu ...

to be no greater than 30 mg/L, with an additional requirement for removal of 85 percent of the quantities measured in untreated sewage from the City of Arcata. Unfortunately, when measuring concentrations leaving treatment wetlands, neither of these analytical methods can distinguish between unremoved

conventional pollutant A conventional pollutant is a term used in the USA to describe a water pollutant that is amenable to treatment by a municipal sewage treatment plant. A basic list of conventional pollutants is defined in the U.S. Clean Water Act. The list has been ...

s originally arriving in sewage, or detritus of decomposing wetland vegetation; so the limitations may apply to the sum of both.Franson, Mary Ann ''Standard Methods for the Examination of Water and Wastewater'' 14th Edition (1976) American Public Health Association pp.89-95&543-544

Wildlife

The Arcata Marsh and Wildlife Sanctuary encompasses 307 acres of land situated along the

. Over 327 species of birds have been recorded at the sanctuary. Numerous plant,

fish A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can ...

insect Insects (from Latin ') are Hexapoda, hexapod invertebrates of the class (biology), class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (Insect morphology#Head, head, ...

reptile Reptiles, as commonly defined, are a group of tetrapods with an ectothermic metabolism and Amniotic egg, amniotic development. Living traditional reptiles comprise four Order (biology), orders: Testudines, Crocodilia, Squamata, and Rhynchocepha ...

and

amphibian Amphibians are ectothermic, anamniote, anamniotic, tetrapod, four-limbed vertebrate animals that constitute the class (biology), class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all Tetrapod, tetrapods, but excl ...

species inhabit the marsh. These include river otters,

gray fox The gray fox (''Urocyon cinereoargenteus''), or grey fox, is an omnivorous mammal of the family Canidae, widespread throughout North America and Central America. This species and its only congener (biology), congener, the diminutive island fox ...

es, red-legged frog,

tidewater goby ''Eucyclogobius newberryi'', the northern tidewater goby, is a species of goby native to lagoons of streams, marshes, and creeks along the coast of California, United States. The northern tidewater goby is one of six native goby species of Califo ...

bobcat The bobcat (''Lynx rufus''), also known as the wildcat, bay lynx, or red lynx, is one of the four extant species within the medium-sized wild cat genus '' Lynx''. Native to North America, it ranges from southern Canada through most of the c ...

striped skunk The striped skunk (''Mephitis mephitis'') is a skunk of the genus ''Mephitis (genus), Mephitis'' that occurs across much of North America, including southern Canada, the United States, and northern Mexico. It is currently listed as least concern ...

praying mantis Mantises are an order (Mantodea) of insects that contains over 2,400 species in about 460 genera in 33 families. The largest family is the Mantidae ("mantids"). Mantises are distributed worldwide in temperate ...

and red-sided garter snake.

Arcata Marsh Interpretive Center

The Friends of the Arcata Marsh (FOAM) operate the Arcata Marsh Interpretive Center that contains exhibits about the operations of the treatment plant, the importance of the marsh, and about the plants and animals that live there. Volunteer docents give tours of the marsh. Education programs are offered for school, scout and other groups, as well as summer camp programs.

References

External links

City of Arcata - Arcata Marsh and Wildlife Sanctuary
* Appropedia.org - Arcata Marsh Overview {{DEFAULTSORT:Arcata Wastewater Treatment Plant And Wildlife Sanctuary Arcata, California Sewage treatment plants in California Nature reserves in California Wildlife sanctuaries of the United States Constructed wetlands Waste treatment technology Museums in Humboldt County, California Nature centers in California Natural history museums in California Protected areas of Humboldt County, California 1949 establishments in California Protected areas established in 1949