Ethylbenzene

Other distribution data

Administrative data

Endpoint:

other distribution data

Type of information:

calculation (if not (Q)SAR)

Remarks:

Migrated phrase: estimated by calculation

Adequacy of study:

key study

Study period:

1986

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study not conducted in accordance to GLP and guidelines. Process has been validated and complete data is available along with the report

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

reference to same study

Cross-reference 2

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1986

Materials and methods

Test guideline

Qualifier:

no guideline available

Principles of method if other than guideline:

VOLAT, a computer program was developed to estimate the impact of volatilization on the removal of organic chemicals from wastewater treatment facilities.

GLP compliance:

not specified

Type of study:

volatility

Media:

other:

Test material

Test material information

Constituent 1

Reference substance name:

Ethylbenzene

EC Number:

202-849-4

EC Name:

Ethylbenzene

Cas Number:

100-41-4

Molecular formula:

C8H10

IUPAC Name:

ethylbenzene

Details on test material:

- Name of test material (as cited in study report): Ethylbenzene

Results and discussion

Any other information on results incl. tables

Ethylbenzene was used to validate the VOLAT model and the ability of this model to predict operation of wastewater systems which operate at high salt concentrations was tested. Average concentrations of volatile chemicals in the influent and effluent of the Texas Wastewater treatment system (B-Pond) reported for the period from July 24 to July 31, 1978 are summarized in Table 1. Data obtained during operation of the aerated lagoon pilot plant in the absence of biological growth (August 7 to August 10, 1978) are summarized in Table 2.

Although only limited data were available, the correlations between the measured and predicted effluent concentrations were reasonable for the majority of the chemicals, particularly in the case of results for operation of the aerated lagoon pilot plant. There was disagreement noted in the analysis of the B-pond data due to limited database and variations in the influent loading during the study period.

Applicant's summary and conclusion

Conclusions:

The model does an adequate job of predicting the effluent concentrations of chemicals for which volatilization is the primary removal mechanism.

Executive summary:

VOLAT, a computer program was developed to estimate the impact of volatilization on the removal of organic chemicals from wastewater treatment facilities. Input parameters required for the program include data on the physical configuration (volume, surface area, depth) and operating conditions (hydraulic flow, aeration rate, temperature, salinity) of the treatment plant and the physical properties (molecular weight, vapor pressure, water solubility) of the organic chemical. The program is based on a mass balance equation which estimates the effluent concentration of a chemical as a function of influent loading and losses due to physical transport processes only (evaporation and air-stripping).

Ethylbenzene was used to validate the VOLAT model and the ability of this model to predict operation of wastewater systems which operate at high salt concentrations was tested. Although only limited data were available, the correlations between the measured and predicted effluent concentrations were reasonable for the majority of the chemicals, particularly in the case of results for operation of the aerated lagoon pilot plant. There was disagreement noted in the analysis of the B-pond data due to limited database and variations in the influent loading during the study period.