THE IMPACTS OF MULTI-JURISDICTIONAL AGREEMENTS AND
EFFLUENT DISPOSAL BY CITRUS IRRIGATION ON THE
DEVELOPMENT OF AN INDUSTRIAL WASTE PRETREATMENT
PROGRAM
Erik L. Melear, Associate Environmental Engineer
H. William Persons, Senior Engineer
Boyle Engineering Corporation
Orlando, Florida 32801
Thomas L. Lothrop, Project Manager
Bureau of Wastewater
City of Orlando
Orlando, Florida 32801
INTRODUCTION
The City of Orlando, Florida, has developed an industrial waste pretreatment program (1WPP)
to monitor and control non-residential discharges to its collection system and wastewater treatment
plants. Program development was impacted by sludge disposal limits, stringent discharge standards
for effluent reuse and wasteload allocations for Class HI surface waters. Uniform program enforcement was complicated by inter-local multi-jurisdictional agreements with wholesale customers outside
Ihe municipal jurisdiction. EPA has mandated that the elements of both the Sewer Use Ordinances
and IWPPs of the city, and all contributors to the city's wastewater treatment plants must be compatible and comply with the general pretreatment regulations (40 CFR 403). Additional stringent local
pollutant discharge standards have been established for metals and several priority and conventional
pollutants to insure acceptable levels of effluent and sludge compatible with disposal plans.
DESCRIPTION OF EXISTING WASTEWATER FACILITIES
Since its inception in 1914, the city's wastewater system has grown from a collection system
serving a few hundred downtown area residents to a service population of 350,000 and a flow capacity
of 41 MGD. System expansions will become operational in 1987 and total system capacity will increase to 52 MGD.
The system serves residential, commercial, and industrial customers within the city limits, surrounding unincorporated urban areas in Orange and Seminole Counties, and neighboring municipalities. The system is separated into two major subsystems, the Easterly and the Westerly. These
systems also have an intersystem transfer capability of 2-3 MGD. A third subsystem, the Southeasterly, will be formed as part of the planned system expansion.
The Easterly subsystem generally lies east of 1-4 and flows to the Iron Bridge Road Regional
WPCF which is located in south Seminole County. This 24 MGD tertiary plant also receives wastewaters from the South Seminole/North Orange County Wastewater Transmission Authority
(SSNOCWTA). SSNOCWTA delivers wastewater from unincorporated areas of north Orange and
south Seminole Counties and the cities of Casselberry, Maitland and Winter Park. The other two
member cities, Oviedo and Winter Springs, currently do not discharge to the system. The effluent is
discharged to the Little Econlochatchee River, a Class III surface water. The effluent must meet a
wasteload allocation of 5-5-3-1 (mg/I) of BOD., TSS, nitrogen, and phosphorus, respectively.
The Westerly subsystem collects wastewater from Orlando west of 1-4 and unincorporated areas
of Orange County. The subsystem also receives flows from the City of Winter Park. Treatment is
provided at the McLeod Road plant, a 15 MGD activated sludge plant. Presently, the effluent is
discharged into Shingle Creek under a Temporary Operating Permit. An agreement with the Florida
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