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Water Waste Treatment Cortney Duquette, UNH Manchester, crd2006@wildcats.unh.edu Abstract Purpose Intro Images of the Process Results Results/Discussion References Robinson, Robert from the Department of Public Works, Environmental Protection Division, City of Manchester Water.EPA.gov The remaining sludge will be incinerated and used for agriculture. All images above by Cortney Duquette How to manage water waste in the most eco-friendly way manageable. Clean Water is returned to the river. Daily return of treated water is estimated at 25 million gallons. During the winter months or on a rainy day the facility becomes overwhelmed with amount of water coming in and not all water will be treated, it will be returned directly to the river. How to help reduce contaminants with small steps at home Avoid letting anything but water go down the drain at home. No grease, hair, food etc. Avoid littering. Runoff from the road is bad enough without cigarettes, cups, animal waste etc. being added to the runoff Be aware of what you flush down your toilet Try to avoid using chemical cleaning products Clean water is essential for many forms of life, but with the use of water comes waste. Water waste must be cleaned and treated before returning to our rivers, but is water treatment eco-friendly? Water Waste treatment is eco-friendly but there are other ways to further how green it can be. Introducing other options into disinfecting the water without chemicals, to powering the plant and how the community can help to decrease the amount of water waste produced are all steps to help green the process even more. Image by Cortney Duquette First treatment of water waste consists of removing the suspended solids then introducing bacteria (anaerobic and aerobic) to the water. This process is a safe eco friendly process that contributes to cleaning the water without the use of any hazardous chemicals. The clarifiers are used to separate the suspended solids that remain from the preliminary treatments During the disinfection stage the water is introduced into a maze like structure to assure that the chlorine added is disinfecting water thoroughly and allows for a slow flow. Clean water that will return to the river. Chlorine is used for a two hour contact time for disinfection, then the chlorine is neutralized with sodium bisulfite with a contact time of 30 minutes. This disinfects the water but it does come with mild negative effects, according to the MSDS it can be harmful if inhaled. This process is performed safely and monitored care fully. Unfortunately the EPA has been finding chlorinated organics being recycled, meaning the chlorine isn't being completely removed from the treated water. What other options are there? UV radiation! UV radiation can be used to disinfect the water. According to the EPA using UV radiation will penetrate the cell walls of bacteria and cause retardation of the cell therefore inhibiting any reproduction. The cost of UV radiation is comparatively the same to chlorine. Can the Manchester Water Treatment Facility Be More Green? Due to the size of the facility in Manchester NH UV radiation cannot be used for disinfection. The building is heated in the winter months by using the incinerator that is used to burn any of the bio solids that are removed during the clarifying process. Not only are they heating the building with a source that is needed but they pay for the ash to be hauled off. The company who purchases the ash mixes it with compost/soil and sells it for agricultural use. This is making use of waste to help the environment. Is there anything else that can be done? The electric bill for this one facility alone is $1.8 million. Why wouldn’t the river be used to power the electricity? According to Rob the facility looked into purchasing low head turbine generator but the cost wouldn’t pay for itself. Maybe it would be possible if the smaller facilities purchased these turbines and used UV radiation, this would help contribute to making water treatment more green. Also if everyone plays a part in helping we could avoid the amount of water waste being produced, especially because not all the water is required to be treated at a facility and is returned directly back to our rivers.