README FILE
Dataset Title: Ingoldisthorpe and Langham Treatment Wetland Dissolved Gas Dataset (2025)

GENERAL INFORMATION

Title of Dataset
Ingoldisthorpe and Langham Treatment Wetland Dissolved Gas Concentration Dataset (2025)

Date of Data Collection
2025

Location of Data Collection
Ingoldisthorpe Treatment Wetland
Langham Treatment Wetland

Keywords
Treatment wetlands, dissolved gases, methane, carbon dioxide, greenhouse gases, wastewater treatment, carbon dynamics, dissolved methane, dissolved carbon dioxide, ecological engineering

Data Collection and Analysis
Ayisha Affo Souleymane
PhD Researcher
School of Water, Energy and Environment
Cranfield University

Collaborating Organisations
Anglian Water
Norfolk Rivers Trust

Supervisory Institution
Cranfield University

Funding Source
This dataset was generated as part of a PhD research project investigating carbon dynamics, greenhouse gas behaviour, and environmental multifunctionality within treatment wetlands.

METHODOLOGICAL INFORMATION

Description of Dataset
This dataset contains dissolved gas concentration measurements collected from the Ingoldisthorpe and Langham treatment wetlands during 2025.

The dataset includes measurements associated with:

* dissolved methane (CH4),
* dissolved carbon dioxide (CO2),
* aqueous greenhouse gas concentrations,
* and dissolved gas dynamics within the treatment wetland systems.

The dataset was developed to investigate:

* dissolved greenhouse gas behaviour,
* spatial variability in dissolved gas concentrations,
* carbon cycling dynamics,
* and relationships between water chemistry and greenhouse gas production.

Description of Data Collection
Water samples were collected from multiple monitoring locations throughout both treatment wetland systems.

Headspace equilibration methods were used to estimate dissolved gas concentrations.

Measured parameters may include:

* Dissolved methane concentration
* Dissolved carbon dioxide concentration
* Headspace gas concentrations
* Sampling temperature
* Sampling location
* Equilibration parameters

Analytical Methods

Dissolved Gas Sampling
Water samples were collected in sealed containers to minimise atmospheric gas exchange.

Headspace gas equilibration procedures were undertaken using inert gas displacement methods.

Headspace Equilibration Procedure
Approximately 500 mL water samples were collected for dissolved gas analysis.

A defined volume of headspace gas was displaced and replaced with inert gas. Samples were shaken to establish gas equilibrium between dissolved and gaseous phases prior to gas sampling.

Gas Analysis
Headspace gas samples were analysed using gas chromatography procedures where applicable.

Dissolved Gas Calculations
Dissolved gas concentrations were calculated using headspace concentration data, equilibrium relationships, temperature corrections, and gas partitioning calculations.

Experimental Conditions
Sampling was undertaken under operational full-scale wastewater treatment wetland conditions during 2025.

Measurements represent real-world treatment wetland hydraulic and environmental conditions.

Quality Assurance / Quality Control (QA/QC)

* Sampling procedures were standardised across all locations.
* Samples were sealed immediately following collection to minimise atmospheric exchange.
* Laboratory instrumentation was calibrated prior to analysis.
* Data were checked for transcription and calculation errors prior to analysis.
* Missing values were retained as blank cells where applicable.

SHARING AND ACCESS INFORMATION

License and Restrictions
Dataset generated as part of doctoral research at Cranfield University in collaboration with Anglian Water and Norfolk Rivers Trust.

Users should acknowledge Cranfield University, Anglian Water, and Norfolk Rivers Trust where appropriate.

Associated Publications
This dataset contributes to ongoing PhD research examining greenhouse gas behaviour, carbon dynamics, and environmental multifunctionality within tertiary surface flow treatment wetlands.

Recommended Citation
Souleymane, A. A. (2026). Ingoldisthorpe and Langham Treatment Wetland Dissolved Gas Concentration Dataset (2025). Cranfield University.

FILE NAME STRUCTURE AND FORMAT

File Name
ING_LAN_TW_DissolvedGas_2025_v01.csv

File Structure
Single comma-separated values (CSV) file containing dissolved gas concentration measurements and associated analytical calculations.

File Format
CSV (Comma-Separated Values)

Date Format
YYYY-MM-DD where applicable.

DATA-SPECIFIC INFORMATION

Dataset Description
The dataset contains dissolved greenhouse gas concentration measurements collected from multiple locations within the Ingoldisthorpe and Langham treatment wetlands during 2025.

Variable Definitions

Gas Variables

* Dissolved CH4 = Dissolved methane concentration
* Dissolved CO2 = Dissolved carbon dioxide concentration
* Headspace CH4 = Methane concentration in headspace gas
* Headspace CO2 = Carbon dioxide concentration in headspace gas
* Temperature = Sampling temperature
* Sampling location = Monitoring location identifier

Units of Measurement
Gas concentrations may be reported in mg/L, mmol/L, ppm, or equivalent units unless otherwise stated.

Missing Data Codes
Blank cells indicate unavailable or missing measurements.

Abbreviations

* TW = Treatment Wetland
* CH4 = Methane
* CO2 = Carbon Dioxide
* GHG = Greenhouse Gas

VERSIONING

Version
Version 1.0

Last Updated
2026-05-29

Change Log
Version 1.0 – Initial compilation and documentation of Ingoldisthorpe and Langham treatment wetland dissolved gas concentration dataset.
