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【正文】 iment chamber, the sedimentation HRT is proportional to the volume of the chamber and inversely proportional to the flow rate. The time required for a particle to settle a specific distance is often referred as the settling time for that particle size and density. Because deeper settling chambers require a greater distance for particles to settle, deeper settling chambers have longer respective settling times. And, because the volume of a sediment chamber is also proportional to the depth of the chamber, increasing the depth increases both the volume (and thereby the HRT) and the settling time. Therefore, increasing the depth of the chamber increases the HRT, but may not increase settling efficiencies since the distance to settle increases proportionally with increase in HRT. Accordingly, the overriding principle of achieving effective sedimentation is to provide the maximum surface and floor areas in the chamber as possible. Other considerations are to increase the path length through the sediment chamber to increase the uniformity of the flow and to prevent high flow rate conditions from resuspending existing sediment (often referred to as scouring). [0008] In a similar manner, the basic principles separation that apply to the settling of particles more dense than water apply to particles that are less dense than water except that the particles float to the surface rather than settle to the bottom of the chamber. Because oils and hydrocarbons are typically less dense than water, because these products can often be separated mechanically by flotation, and because the products can create adverse biological demands on a wetlands system placed downstream of the sedimentation and flotation chamber, it makes sense to allow the floatable products to remain in the chamber and to remove the outflow water from below the surface. [0009] Because the objective of a sedimentation and flotation chamber is to remove sediment and floatable products from the ining water, the accumulated sediment and floatable products will require periodic removal. Systems that are configured to allow easy removal of these products will undoubtedly provide reduced maintenance costs. [0010] Flowrate control is another consideration. Because the performance of some 4 BMPs like sedimentation and flotation chambers and wetlands systems is dependent on hydraulic resident times (HRTs), optimum performance can be obtained by having sufficient control to not allow flow rates to vary excessively beyond certain limits. Devices that can be used to control the flow rate include bypass controls and inlet and outlet control systems such as adjustable valves or orfice plates. [0011] Because some treatment locations may have high levels of specific pollutants and contaminates, specific configurations using additional BMPs may provide benefits and advantages above typical or standard configurations. Such BMPs may include additional filter systems, additional media chambers, aeration, bioremediation systems, irrigation systems, and mixing manifolds. Any system that can be configured to acmodate additional devices and methods of pollution and contaminate removal is by definition a more versatile BMP. [0012] There is, thus, a need for a wetlands stormwater treatment system which can treat high levels of specific pollutants and contaminants. SUMMARY OF THE INVENTION [0013] This invention involves a method for manufacturing and using a wetlands water treatment system (system) which is reliable, dependable, effective, low maintenance and structurally sound. This is a selfcontained wetlands treatment system. The system and housing is easy to maintain and construct. It increases the ability to remove nitrogen with the addition of an anaerobic environment in the lower chamber which promotes denitrification. The system and system housing can be fabricated, built, and assembled in a broad range of sizes and materials to acmodate and treat a broad range of influent flow rates. The functional ponents of the system can be selected, sized, tailored, and assembled to provide a range of performance and options from basic configurations to customized configurations which provide levels of performance suited to specific or individual situations which may require various unique solutions to treat stormwater or even other wastewater. [0014] The system is capable of treating large volumes of polluted or contaminated water. Contaminated water or runoff can include urban runoff, agricultural runoff, and urban, agricultural, mercial or industrial wastewater. This system is beneficial and can be used in many locations, some locations are residential subdivisions, mercial developments, industrial sites, roads and highways, reconstructions, habitat restorations, lake shores, marinas and landings, collection pools, parking lots, 5 transportation terminals and maintenance facilities. The system configuration is adaptable to the local conditions permitting its effective use wherever water treatment is needed or desired. This system is designed to connect to existing drainage collection structures. It contains a vegetated filtration bed, which houses the wetlands system, where plants may grow. From the surface all that is seen of this system is the center cap. The system has a low discharge rate (150 gal/min) allowing it to be used in any type of soil. The low discharge rate will also meet possible hydromodification requirements. Thus, in these types of situations the unit will not only provide treatment, but also necessary flow control. [0015] As water flows through the root zone of the wetlands microbes metabolize petroleum hydrocarbons, nitrogen and other pollutants. The pollutants are attenuated via the processes of filtration, absorption, adsorption, bioaccumulation and bioremediation. Precipit
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