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Background
The utility industry -- seeking to protect the environment while at the same time reducing their risk of fines, costly cleanup efforts and unwanted public scrutiny -- is striving to prevent oil and PCB contamination of soil and water.
For utilities, the problem occurs primarily in manholes and in transformer yards where stormwater is exposed to old transformers and capacitors that have oil or fluids that contain some PCBs. In order to perform maintenance, the stormwater (containing traces of oils, lead and PCBs) must be pumped out of the manholes and retention wells, and treated before it can be discharged to the environment or municipal sewer systems -- an expensive process for any organization.
The Problem
For one utility, this practice -- excluding pumping and transportation of the water to a treatment facility (i.e."ex-situ" treatment) -- costs over 25 cents per gallon. JoDAN Technology, Ltd. (JDT) was asked to develop an in-situ treatment system to address the oil/PCB contaminant concerns. In cooperation with the electric utility, JDT developed the JMOR System consisting of particle filtration and HRM Cartridge units.
The Solution
In June 2000, JDT built and began testing the first system. After four months of operation, the system processed 1,300,000 gallons of manhole wastewater at a cost of only 2.8 cents per gallon. The system removed PCBs, oil, grease and other hydrocarbons to BDL (below detectable limits). As an expected bonus, the system also removed the lead and copper from the effluent water.
The Results
Table 1.0 -- Results from treating 1,300,000 gallons of manhole water.
| |
|
HRM Effluent |
Avg. Influent |
Max. Influent |
| PCB1254 |
ppb |
<1.0 |
3.74 |
40.0 |
| TPH |
ppm |
<5.0 |
367.9 |
21400 |
| Oil & Grease |
ppm |
<5.0 |
17698 |
141000 |
| Lead |
Avg. ppm |
0.020 |
33.0 |
150.0 |
| Copper |
ppm |
<0.01 |
11.6 |
87.0 |
*All PCB samples were below 1.0 ppb.
*All PCB samples were analyzed as PCB Arochlors by the utility company.
*The lead and copper removal was due to the metals existing as organo-metallics.
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