Polishing Filter

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._polishing_filter.PolishingFilter(ID='', ins: Sequence[AbstractStream] | None = None, outs: Sequence[AbstractStream] | None = (), thermo=None, init_with='WasteStream', filter_type='aerobic', OLR=0.09375, HLR=0.275, X_decomp=0.74, X_growth=0.22, biodegradability=1.0, split={}, solids=(), solids_conc=10.5, T=303.15, include_degassing_membrane=False, F_BM={'Membrane': 1.15, 'Pump building': 1.1800826, 'Pumps': 1.1800826}, lifetime={'Pump pipe stainless steel': 15, 'Pump stainless steel': 15, 'Pumps': 15}, **kwargs)

A superclass for anaerobic and aerobic polishing as in Shoener et al. [1] Some assumptions adopted from Humbird et al. [2]

Parameters:

• ins (Inlets(obj)) – Influent, recycle, air (optional & when aerobic).

• outs (Outlets(obj)) – Biogas (when anaerobic), effluent, waste sludge, air (optional & when aerobic).

• filter_type (str) – Can either be “anaerobic” or “aerobic”.

• OLR (float) – Organic loading rate of influent, [kg COD/m3/hr].

• HLR (float) – Hydraulic loading rate of influent, [m3/m2/hr].

• X_decomp (float) – Fraction of the influent COD converted to biogas (filter_type == “anaerobic”) or CO2 (filter_type == “aerobic”).

• X_growth (float) – Fraction of the influent COD converted to biomass growth.

• solids (Iterable(str)) – IDs of the solid components. If not provided, will be set to the default solids attribute of the components.

• split (dict) – Component-wise split to the treated water. E.g., {‘NaCl’:1, ‘WWTsludge’:0} indicates all of the NaCl goes to the treated water and all of the WWTsludge goes to the wasted sludge. Default splits (based on the membrane bioreactor in [2]) will be used if not provided. Note that the split for Water will be ignored as it will be adjusted to satisfy the solids_conc setting.

• biodegradability (float or dict) – Biodegradability of components, when shown as a float, all biodegradable components are assumed to have the same degradability.

• solids_conc (float) – Concentration of the biomass in the waste sludge, [g/L].

• T (float) – Temperature of the filter tank. Will not control temperature if provided as None.

• include_degassing_membrane (bool) – If to include a degassing membrane to enhance methane (generated through the digestion reaction) recovery. No degassing membrane will be added if filter_type is “aerobic”.

• kwargs (dict) – Other keyword arguments (e.g., t_wall, t_slab).

References

[1]

Shoener et al., Design of Anaerobic Membrane Bioreactors for the Valorization of Dilute Organic Carbon Waste Streams. Energy Environ. Sci. 2016, 9 (3), 1102–1112. https://doi.org/10.1039/C5EE03715H.

[2] (1,2)

Humbird et al., Process Design and Economics for Biochemical Conversion of Lignocellulosic Biomass to Ethanol: Dilute-Acid Pretreatment and Enzymatic Hydrolysis of Corn Stover; Technical Report NREL/TP-5100-47764; National Renewable Energy Lab (NREL), 2011. https://www.nrel.gov/docs/fy11osti/47764.pdf

property D

[float] Depth of the filter tank, [ft].

property D_B

[float] Depth of the reactor building, [ft].

property HLR

[float] Hydraulic loading rate, [m3/m2/hr].

property L_B

[float] Length of the reactor building, [ft].

property N_degasser

[int] Number of degassing membrane needed for dissolved biogas removal (optional).

property N_filter

[int] Number of filter tanks.

property OLR

[float] Organic loading rate, [kg COD/m3/hr].

property Q_cmd

[float] Influent volumetric flow rate in cubic meter per day, [cmd].

property Q_mgd

[float] Influent volumetric flow rate in million gallon per day, [mgd].

property W_B

[float] Width of the reactor building, [ft].

property X_decomp

[float] Fraction of the influent COD converted to biogas (filter_type == “anaerobic”) or CO2 (filter_type == “aerobic”).

property X_growth

[float] Fraction of the influent COD converted to biomass growth.

auxiliary_unit_names: tuple[str, ...] = ('heat_exchanger',)

class-attribute Name of attributes that are auxiliary units. These units will be accounted for in the purchase and installed equipment costs without having to add these costs in the baseline_purchase_costs dictionary. Heat and power utilities are also automatically accounted for.

property biodegradability

[float of dict] Biodegradability of components, when shown as a float, all biodegradable component are assumed to have the same degradability.

property constr_access

[float] Extra room for construction access, [ft].

property d

[float] Diameter of the filter tank, [ft].

property d_max

[float] Maximum filter diameter, [m].

property decomp_rxns

[tmo.ParallelReaction] Organics to biogas (filter_type == “anaerobic”) or CO2 (filter_type == “aerobic”) reactions.

property excav_slope

[float] Slope for excavation (horizontal/vertical).

property filter_type

[str] Can either be “anaerobic” or “aerobic”.

property freeboard

[float] Freeboard added to the depth of the reactor tank, [ft].

property growth_rxns

[tmo.ParallelReaction] Biomass (WWTsludge) growth reactions.

property i_rm

[np.array] Removal of each component in this filter tank.

line: str = 'Polishing filter'

class-attribute Name denoting the type of Unit class. Defaults to the class name of the first child class

property organic_rm

[float] Overall organic (COD) removal rate.

property recir_ratio

[float] Internal recirculation ratio.

property solids_conc

Concentration of solids in the waste sludge, [g/L].

property split

Component-wise split to the treated water.

property t_slab

[float] Concrete slab thickness, [ft].

property t_wall

[float] Concrete wall thickness, [ft].