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Determine TOC removal from biofiltration using Terry & Summers BDOC model

Source: R/biofilter_toc.R
biofilter_toc.Rd

This function applies the Terry model to a water created by define_water to determine biofiltered DOC (mg/L). All particulate TOC is assumed to be removed so TOC = DOC. For a single water use biofilter_toc; for a dataframe use biofilter_toc_df. Use pluck_cols = TRUE to get values from the output water as new dataframe columns. For most arguments in the _df helper "use_col" default looks for a column of the same name in the dataframe. The argument can be specified directly in the function instead or an unquoted column name can be provided.

Usage

biofilter_toc(water, ebct, ozonated = TRUE)

biofilter_toc_df(
  df,
  input_water = "defined",
  output_water = "biofiltered",
  pluck_cols = FALSE,
  water_prefix = TRUE,
  ebct = "use_col",
  ozonated = "use_col"
)

Source

Terry and Summers 2018

Arguments

water

Source water object of class "water" created by define_water.

ebct

The empty bed contact time (min) used for the biofilter.

ozonated

Logical; TRUE if the water is ozonated (default), FALSE otherwise.

df

a data frame containing a water class column, which has already been computed using define_water_df. The df may include a column indicating the EBCT or whether the water is ozonated.

input_water

name of the column of water class data to be used as the input for this function. Default is "defined".

output_water

name of the output column storing updated water class object. Default is "biofiltered".

pluck_cols

Extract water slots modified by the function (doc, toc, bdoc) into new numeric columns for easy access. Default to FALSE.

water_prefix

Append the output_water name to the start of the plucked columns. Default is TRUE.

Value

biofilter_toc returns water class object with modeled DOC removal from biofiltration.

biofilter_toc_df returns a data frame containing a water class column with updated DOC, TOC, and BDOC concentrations. Optionally, it also adds columns for each of those slots individually.

Examples

water <- define_water(ph = 7, temp = 25, alk = 100, toc = 5.0, doc = 4.0, uv254 = .1) %>%
  biofilter_toc(ebct = 10, ozonated = FALSE)
#> 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.


example_df <- water_df %>%
  define_water_df() %>%
  biofilter_toc_df(input_water = "defined", ebct = c(10, 15), ozonated = FALSE)

example_df <- water_df %>%
  define_water_df() %>%
  dplyr::mutate(
    BiofEBCT = c(10, 10, 10, 15, 15, 15, 20, 20, 20, 25, 25, 25),
    ozonated = c(rep(TRUE, 6), rep(FALSE, 6))
  ) %>%
  biofilter_toc_df(input_water = "defined", ebct = BiofEBCT)