Design of Wastewater Systems

 

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TREATMENT

A.E. Hodsdon's philosophy for design is to give the community the simplest technology to treat the waste. In many rural communities, this is a stabilization pond or and aerated lagoon. When space is the problem, the more activated sludge facilities must be used. 

The firm's waste water design experience covers major municipal treatment facilities ranging from sand filters to stabilization ponds, to aerated lagoons to activated sludge.

Design of Wastewater Systems

 

Design of Wastewater Systems

SLUDGE HANDLING

We encourage the simpler technologies instead of the more complex processes. Land spreading or land injection is still the most cost effective for most rural communities. Freeze drying of sludge has also been very effective in the state of Maine.

 

Design of Wastewater Systems

COLLECTION

Our policy is to build gravity systems where it is cost effective. Our experience is that public sewers that are deeper than 12 feet are not cost effective. Maine has a high water table and these deep pipes tend to allow more infiltration with time. Furthermore, these pipes are expensive to install and maintain. 

 

Design of Wastewater Systems

INTERCEPTOR SEWERS

These designs include gravity runs whenever possible and run along existing road rights-of-way. These pipes have ranged in size from 8" to 30" in diameter, and again we try to keep the depth at less than 12 feet. 

 

Design of Wastewater Systems

PUMP STATIONS

Our pump station designs have ranged in size from 100 gpm to 1200 gpm. Our designs have used many submersible-pumping arrangements. A few of the larger pump stations have been with the wet well/dry well design. Our policy is to begin evaluating the need fro a pump station once the depth of the pipe reaches 12 feet. 

 

Design of Wastewater Systems

SMALL SYSTEMS

The firm has been a leader in the design of small community wastewater systems. We have learned that large gravity collection systems are a problem. Pressure collection systems have proven themselves for this type of application. 

 

Design of Wastewater Systems

SEPTIC AND SLUDGE SITES

Our firm has designed several septage storage sites and septage disposal sites. Every Maine town is required to have facilities available for septage disposal. Our services have helped these towns to comply with that requirement.