Returns a data frame with a breakthrough curve based on the TOC concentration after passing through GAC treatment, according to the model developed in "Modeling TOC Breakthrough in Granular Activated Carbon Adsorbers" by Zachman and Summers (2010), or the USEPA WTP Model v. 2.0 Manual (2001).
Water must contain DOC or TOC value.
Usage
gacrun_toc(
water,
ebct = 10,
model = "Zachman",
media_size = "12x40",
bvs = c(2000, 20000, 100)
)
gacrun_toc_df(
df,
input_water = "defined",
water_prefix = TRUE,
ebct = "use_col",
model = "use_col",
media_size = "use_col",
bvs = "use_col"
)Source
See references list at: https://github.com/BrownandCaldwell-Public/tidywater/wiki/References
Zachman and Summers (2010)
USEPA (2001)
Arguments
- water
Source water object of class "water" created by define_water
- ebct
Empty bed contact time (minutes). Model results are valid for 10 or 20 minutes. Default is 10 minutes.
- model
Specifies which GAC TOC removal model to apply. Options are Zachman and WTP.
- media_size
Size of GAC filter mesh. If model is Zachman, can choose between 12x40 and 8x30 mesh sizes, otherwise leave as default. Defaults to 12x40.
- bvs
If using WTP model, option to run the WTP model for a specific sequence of bed volumes, otherwise leave as default. Defaults c(2000, 20000, 100).
- df
a data frame containing a water class column, which has already been computed using define_water_df. The df may include a column named for the coagulant being dosed, and a column named for the set of coefficients to use.
- input_water
name of the column of water class data to be used as the input for this function. Default is "defined".
- water_prefix
Append the input_water name to the start of the output columns. Default is TRUE.
Value
gacrun_toc returns a data frame with bed volumes and breakthrough TOC values.
gacrun_toc_df returns a data frame containing columns of the breakthrough curve (breakthrough and bed volume).
Details
GAC model for TOC removal
The function will calculate bed volumes and normalized TOC breakthrough (TOCeff/TOCinf) given model type. Both models were developed using data sets from bench-scale GAC treatment studies using bituminous GAC and EBCTs of either 10 or 20 minutes. The specific mesh sizes used to develop the Zachman and Summers model were 12x40 or 8x30. The models were also developed using influent pH and TOC between specific ranges. Refer to the papers included in the references for more details.
Examples
water <- define_water(ph = 8, toc = 2.5, uv254 = .05, doc = 1.5) %>%
gacrun_toc(media_size = "8x30", ebct = 20, model = "Zachman")
#> Warning: Missing value for alkalinity. Carbonate balance will not be calculated.
#> Warning: Major ions missing and neither TDS or conductivity entered. Ideal conditions will be assumed. Ionic strength will be set to NA and activity coefficients in future calculations will be set to 1.
# \donttest{
example_df <- water_df %>%
define_water_df() %>%
gacrun_toc_df()
# }