Treatment Bed¶

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.sanunits._treatment_bed.DryingBed(ID='', ins: Sequence[AbstractStream] | None = None, outs: Sequence[AbstractStream] | None = (), thermo=None, init_with='WasteStream', design_type='unplanted', degraded_components=('OtherSS',), **kwargs)¶

Unplanted and planted drying bed for solids based on Trimmer et al.

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

Parameters:

ins (WasteStream) – Solid for drying.
outs (WasteStream) – Dried solids, evaporated water, fugitive CH4, and fugitive N2O.
design_type (str) – Can be “unplanted” or “planted”. The default unplanted process has a number of “covered”, “uncovered”, and “storage” beds. The storage bed is similar to the covered bed, but with higher wall height.

Examples

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.

See also

qsdsan.processes.Decay

property N_bed¶: [dict] Number of the different types of drying beds, float will be converted to the smallest integer.

property bed_H¶: [dict] Wall height of the different types of drying beds, [m].

property bed_L¶: [dict] Length of the different types of drying beds, [m].

property bed_W¶: [dict] Width of the different types of drying beds, [m].

property column_H¶: [float] Column height for covered bed, [m].

property column_per_side¶: [int] Number of columns per side of covered bed, float will be converted to the smallest integer.

property column_unit_mass¶: [float] Unit mass of the column, [kg/m].

property concrete_thickness¶: [float] Thickness of the concrete wall.

property cover_slope¶: [float] Slope of the bed cover, [°].

property cover_unit_mass¶: [float] Unit mass of the bed cover, [kg/m2].

property design_type¶: [str] Drying bed type, can be either “unplanted” or “planted”.

line: str = 'Drying bed'¶: class-attribute Name denoting the type of Unit class. Defaults to the class name of the first child class

property sol_frac¶: [float] Final solid content of the dried solids.

property tau¶: [float] Retention time, [d].

class qsdsan.sanunits._treatment_bed.LiquidTreatmentBed(ID='', ins: Sequence[AbstractStream] | None = None, outs: Sequence[AbstractStream] | None = (), thermo=None, init_with='WasteStream', **kwargs)¶

For secondary treatment of liquid based on Trimmer et al.

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

Parameters:

ins (WasteStream) – Waste for treatment.
outs (WasteStream) – Treated waste, fugitive CH4, and fugitive N2O.

Examples

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.

See also

qsdsan.processes.Decay

property N_bed¶: [int] Number of treatment beds, float will be converted to the smallest integer.

property bed_H¶: [float] Bed height, [m].

property bed_L¶: [float] Bed length, [m].

property bed_W¶: [float] Bed width, [m].

property concrete_thickness¶: [float] Thickness of the concrete wall.

line: str = 'Liquid treatment bed'¶: class-attribute Name denoting the type of Unit class. Defaults to the class name of the first child class

property tau¶: [float] Residence time, [d].