Dimensions - Summer 2017 - 1
spotli g h t on
t h e sta f f
Lynne
Putnam, PE, PMP, ENV SP
Senior Associate
Wastewater technology has improved over the
The new law requires the Maryland Department of
past decade, including advances in self-cleaning
the Environment to create regulations to encourage the
membranes and small advanced treatment systems.
use of these technologies for onsite sewage disposal and to
Earlier this year, the state of Maryland approved a new
revise the maximum hydraulic loading rate for advanced
law that encourages the use of advanced wastewater
systems to 2.5 gallons per day/square foot instead of
technologies for non-residential onsite disposal. This
the previous maximum disposal rate of 1.2 gallons per
law is an important move for sensible and sustainable
day/square foot. These new regulations allow for fewer
development in areas that make up the urban fringe of
trees removed, less ground disturbed, and less area to
more densely populated areas and was supported by a
be maintained as a drain field. There are also technical,
wide spectrum of parties.
social, and economic incentives for local governments
The more effective use of membrane bio-reactors
who are responsible for monitoring these systems
(MBRs) is a great example of this advancement. MBRs
since cleaner discharges, smaller wastewater system
clean wastewater more efficiently than conventional
footprints, and less environmental disruption leads to
systems, reducing solids and nutrient loadings into
better use of available land and overall sustainability. The
the subsurface disposal fields. Originally, MBRs were
successful approval of this law demonstrates the potential
limited to the same disposal rates for the design of
for regulators to look favorably on technologically
their drain fields as that of conventional treatment.
advanced solutions for wastewater treatment, while
There was no incentive to owners who were considering
encouraging semi-rural communities to invest in more
installing the new MBR systems with the goal of being
environmentally sound solutions.
environmentally proactive.
Summer 2017
1
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In This Issue
Dimensions - Summer 2017 - Cover1
Dimensions - Summer 2017 - In This Issue
Dimensions - Summer 2017 - 1
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