Lagoon¶

QSDsan: Quantitative Sustainable Design for sanitation and resource recovery systems

This module is developed by:

Yalin Li <mailto.yalin.li@gmail.com>

This module is under the University of Illinois/NCSA Open Source License. Please refer to https://github.com/QSD-Group/QSDsan/blob/main/LICENSE.txt for license details.

class qsdsan.unit_operations.static._lagoon.Lagoon(ID='', ins: Sequence[AbstractStream] | None = None, outs: Sequence[AbstractStream] | None = (), thermo=None, init_with='WasteStream', design_type='anaerobic', flow_rate=None, degraded_components=('OtherSS',), if_N2O_emission=False, **kwargs)¶

Anaerobic and facultative lagoon treatment based on Trimmer et al.

To enable life cycle assessment, the following impact items should be pre-constructed: Plastic, Excavation.

Parameters:

ins (WasteStream) – Waste for treatment.
outs (WasteStream) – Treated waste, fugitive CH4, and fugitive N2O.
design_type (str) – Can be “anaerobic” or “facultative”.
flow_rate (float) – Total flow rate through the lagoon (to calculate retention time), [m3/d]. If not provided, will use F_vol_in.

Examples

>>> from qsdsan.utils import create_example_sanitation_components
>>> cmps = create_example_sanitation_components()
>>> from qsdsan import System, WasteStream
>>> from qsdsan.unit_operations import Lagoon
>>> ws = WasteStream('ws', H2O=1000, NH3=5, NonNH3=2, P=1, K=1,
...                  OtherSS=20, units='kg/hr')
>>> L = Lagoon('L', ins=ws, outs=('treated', 'CH4', 'N2O'),
...            design_type='anaerobic', flow_rate=1000,
...            decay_k_COD=3, max_CH4_emission=0.25)
>>> sys = System('sys', path=(L,))
>>> sys.simulate()
>>> L.design_results['Lagoon number']
3

See bwaise systems for use in a complete sanitation system.

References

[1] Trimmer et al., Navigating Multidimensional Social–Ecological System Trade-Offs across Sanitation Alternatives in an Urban Informal Settlement. Environ. Sci. Technol. 2020, 54 (19), 12641–12653. https://doi.org/10.1021/acs.est.0c03296.