Clinical Evaluation of a Chairside Amalgam Separator to Meet Environmental Protection Agency Dental Wastewater Regulatory Compliance

2020 ◽  
Vol 45 (2) ◽  
pp. 151-162
Author(s):  
DS Olivera ◽  
MT Morgan ◽  
SN Tewolde ◽  
EC Botts ◽  
FP Horvath ◽  
...  
Keyword(s):  
Service Life ◽  
Environmental Protection ◽  
Environmental Protection Agency ◽  
Inductively Coupled Plasma ◽  
Dental Treatment ◽  
Regulatory Compliance ◽  
Protection Agency ◽  
Treatment Facility ◽  
Retention Efficiency ◽  
The Mean

SUMMARY Objectives: The aim of this study was to evaluate the performance of a commercially available chairside amalgam separator (CAS) in a clinical setting in which a relatively high number of amalgam restorations are placed. Performance parameters investigated included service life, amalgam collected, mercury concentrations in effluent, and solids retention efficiency. Methods and Materials: CASs were tested per International Organization of Standardization (ISO) 11143:2008 prior to installation in a military dental treatment facility and after removal from service (n=4) in order to confirm compliance with the recently enacted United States Environmental Protection Agency (EPA) Effluent Limitations Guidelines and Standards for the Dental Category. During the units' time in service, biweekly effluent grab samples were collected from the high-volume evacuation system of each chair (n=6) and analyzed for total mercury concentration by inductively coupled plasma mass spectrometry (ICP-MS). The mean total accumulated solids at the end of service life (n=6) was determined for potential design optimization. The service life expectancy in a military dental treatment facility was determined in terms of calendar and workdays. Procedural data were collected to determine the daily mean number of amalgam surfaces placed during the service life of each chairside amalgam separator (n=9). Results: The CAS evaluated met minimum EPA compliance requirements when used in a military dental treatment facility. The solids removal efficiency at the end of service life was 99.82% ± 0.14% (n=4). The mean service life (n=8) was 131.6 ± 45.1 calendar days (67.1±37.6 workdays). Effluent mercury concentrations ranged from 0.05 to 11.93 mg/L. Total solids accumulated in each CAS (n=6) at the end of service life was 195.4 ± 63.4 g. The mean number of amalgam surfaces placed per workday during the service life span of each CAS was 8.4 ± 1.4.

scholarly journals Modifications to United States Environmental Protection Agency Methods 1622 and 1623 for Detection of Cryptosporidium Oocysts and Giardia Cysts in Water

2003 ◽  
Vol 69 (1) ◽  
pp. 267-274 ◽  
Author(s):  
Randi M. McCuin ◽  
Jennifer L. Clancy
Keyword(s):  
Environmental Protection ◽  
Water Samples ◽  
Environmental Protection Agency ◽  
Tap Water ◽  
Sample Collection ◽  
Protection Agency ◽  
Cryptosporidium Oocysts ◽  
The Mean ◽  
Epa Methods ◽  
Made In

ABSTRACT Collaborative and in-house laboratory trials were conducted to evaluate Cryptosporidium oocyst and Giardia cyst recoveries from source and finished-water samples by utilizing the Filta-Max system and U.S. Environmental Protection Agency (EPA) methods 1622 and 1623. Collaborative trials with the Filta-Max system were conducted in accordance with manufacturer protocols for sample collection and processing. The mean oocyst recovery from seeded, filtered tap water was 48.4% ± 11.8%, while the mean cyst recovery was 57.1% ± 10.9%. Recovery percentages from raw source water samples ranged from 19.5 to 54.5% for oocysts and from 46.7 to 70.0% for cysts. When modifications were made in the elution and concentration steps to streamline the Filta-Max procedure, the mean percentages of recovery from filtered tap water were 40.2% ± 16.3% for oocysts and 49.4% ± 12.3% for cysts by the modified procedures, while matrix spike oocyst recovery percentages ranged from 2.1 to 36.5% and cyst recovery percentages ranged from 22.7 to 68.3%. Blinded matrix spike samples were analyzed quarterly as part of voluntary participation in the U.S. EPA protozoan performance evaluation program. A total of 15 blind samples were analyzed by using the Filta-Max system. The mean oocyst recovery percentages was 50.2% ± 13.8%, while the mean cyst recovery percentages was 41.2% ± 9.9%. As part of the quality assurance objectives of methods 1622 and 1623, reagent water samples were seeded with a predetermined number of Cryptosporidium oocysts and Giardia cysts. Mean recovery percentages of 45.4% ± 11.1% and 61.3% ± 3.8% were obtained for Cryptosporidium oocysts and Giardia cysts, respectively. These studies demonstrated that the Filta-Max system meets the acceptance criteria described in U.S. EPA methods 1622 and 1623.

scholarly journals Kajian Awal Fitoremediasi Merkuri Pada Caulerpa serrulata dan Halimeda macroloba dari Perairan Teluk Totok

2015 ◽  
Vol 3 (2) ◽  
pp. 8
Author(s):  
Dedy Octavian Siahaan ◽  
Desy M. H. Mantiri ◽  
Antonius Rumengan
Keyword(s):  
Environmental Protection ◽  
Mass Spectroscopy ◽  
Environmental Protection Agency ◽  
Inductively Coupled Plasma ◽  
Protection Agency ◽  
Inductively Coupled ◽  
United State ◽  
Icp Ms

Penelitian ini dilakukan dengan tujuan untuk mengetahui kemampuan alga spesies Caulerpa serrulata dan Halimeda macroloba sebagai agen fitoremediator merkuri di perairan laut. Analisis merkuri pada sedimen dan jaringan alga berdasarkan metode standar United State Environmental Protection Agency (USEPA) yang dilakukan di Water Laboratory Nusantara (WLN) dengan menggunakan Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) instrument. Hasil penelitian memperlihatkan bahwa Caulerpa serrulata mampu mengabsorbsi merkuri sebanyak 0,20 ppm dan Halimeda macroloba mampu mengabsorbsi sebanyak 0,11 ppm dari perairan Teluk Totok. Selain itu kemampuan Caulerpa serrulata dan Halimeda macroloba mentoleransi kadar merkuri yang tinggi di sedimen tempat alga tersebut tumbuh bisa menjadi pertimbangan bahwa alga tersebut memiliki potensi untuk dapat digunakan sebagai salah satu organisme fitoremediaotor merkuri di perairan laut.

Kajian Awal Fitoremediasi Merkuri Pada Caulerpa serrulata dan Halimeda macroloba dari Perairan Teluk Totok

2015 ◽  
Vol 3 (2) ◽  
pp. 8
Author(s):  
Dedy Octavian Siahaan ◽  
Desy M. H. Mantiri ◽  
Antonius Rumengan
Keyword(s):  
Environmental Protection ◽  
Mass Spectroscopy ◽  
Environmental Protection Agency ◽  
Inductively Coupled Plasma ◽  
Protection Agency ◽  
Inductively Coupled ◽  
United State ◽  
Icp Ms

Penelitian ini dilakukan dengan tujuan untuk mengetahui kemampuan alga spesies Caulerpa serrulata dan Halimeda macroloba sebagai agen fitoremediator merkuri di perairan laut. Analisis merkuri pada sedimen dan jaringan alga berdasarkan metode standar United State Environmental Protection Agency (USEPA) yang dilakukan di Water Laboratory Nusantara (WLN) dengan menggunakan Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) instrument. Hasil penelitian memperlihatkan bahwa Caulerpa serrulata mampu mengabsorbsi merkuri sebanyak 0,20 ppm dan Halimeda macroloba mampu mengabsorbsi sebanyak 0,11 ppm dari perairan Teluk Totok. Selain itu kemampuan Caulerpa serrulata dan Halimeda macroloba mentoleransi kadar merkuri yang tinggi di sedimen tempat alga tersebut tumbuh bisa menjadi pertimbangan bahwa alga tersebut memiliki potensi untuk dapat digunakan sebagai salah satu organisme fitoremediaotor merkuri di perairan laut.

Municipal Wastewater Treatment Technology Transfer Activities of the United States Environmental Protection Agency

1989 ◽  
Vol 21 (6-7) ◽  
pp. 685-698
Author(s):  
J. J. Convery ◽  
J. F. Kreissl ◽  
A. D. Venosa ◽  
J. H. Bender ◽  
D. J. Lussier
Keyword(s):  
Technology Transfer ◽  
Environmental Protection ◽  
Case Studies ◽  
Environmental Protection Agency ◽  
The United States ◽  
Environmental Research ◽  
Outreach Program ◽  
Small Community ◽  
Protection Agency ◽  
Transfer Programs

Technology transfer is an important activity within the ll.S. Environmental Protection Agency. Specific technology transfer programs such as the activities of the Center for Environmental Research Information, the Innovative and Alternative Technology Program, as well as the Small Community Outreach Program are used to encourage the utilization of cost-effective municipal pollution control technology. Case studies of three technologies including a plant operations diagnostic/remediation methodology, alternative sewer technologies and ultraviolet disinfection are presented. These case studies are presented retrospectively in the context of a generalized concept of how technology flows from science to utilization which was developed in a study by Allen (1977). Additional insights from this study are presented on the information gathering characteristics of engineers and scientists which may be useful in designing technology transfer programs. The recognition of the need for a technology or a deficiency in current practice are important stimuli other than technology transfer for accelerating the utilization of new technology.

The Hornsby Bend Hyacinth Facility in Austin, Texas

1987 ◽  
Vol 19 (10) ◽  
pp. 41-49 ◽  
Author(s):  
Ray Dinges ◽  
Jim Doersam
Keyword(s):  
Environmental Protection ◽  
Environmental Protection Agency ◽  
Plant Material ◽  
Animal Species ◽  
Performance Data ◽  
Operational Performance ◽  
Fish Production ◽  
Protection Agency ◽  
Functional Characteristics ◽  
The City

The Hornsby Bend Hyacinth Facility, the first such system built under the U. S. Environmental Protection Agency “Construction Grants Program”, represents the culmination of over a decade of experience at the City of Austin with hyacinth treatment. The facility consists of three culture basins 265 m in length with an area of 1.6 ha. To permit year-round hyacinth culture, basins are covered with a 2.06 ha unitary greenhouse structure. Fenced exclusion areas at intervals along sides of basins serve as natural aerators and enhance fish production. The system, operated in an aerobic mode, was designed to daily treat about three million liters of sludge lagoon supernatant. Exclusion of large vertebrate predators and stocking of basins with selected animal species will provide a unique ecosystem. Basins were planted with hyacinth in late October, 1985 and discharge commenced on February 3, 1986. Functional characteristics and ecological considerations of the facility are discussed and operational performance data are presented. Maintenance harvesting of hyacinth and disposition of plant material are described. Application of greenhoused hyacinth treatment systems are addressed.

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