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PNS.BAFS+364.2023_Biogas+System+—+Specifications+—+Wet+Anaerobic+Digestion+Process.pdf
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Biogas System — Specifications — Wet Anaerobic
Digestion Process
PNS/BAFS 364:2023
ICS 65.040.20
PHILIPPINE
NATIONAL
STANDARD
BUREAU OF AGRICULTURE AND FISHERIES STANDARDS
BPI Compound Visayas Avenue, Diliman, Quezon City 1101 Philippines
Trunkline: (632) 928-8741 to 64 loc. 3301-3319
E-mail: bafs@da.gov.ph
Website: www.bafs.da.gov.ph
Biogas System – Specifications – Wet Anaerobic
Digestion Process
PNS/BAFS 364:2023
Copyright © 2023 by Bureau of Agriculture and Fisheries Standards
All rights reserved. The mention of specific organizations or products, does not mean
endorsement or recommendation from the Bureau of Agriculture and Fisheries
Standards (BAFS) in preference to other of similar nature that are not included. The
BAFS encourages the reproduction and dissemination of the materials upon request.
Applications for permissions to reproduce or disseminate these materials and all other
queries should be addressed to the publisher.
Published by:
Bureau of Agriculture and Fisheries Standards
BAFS Building, BPI Compound, Visayas Avenue, Diliman, Quezon City
info.dabafs@gmail.com | bafs@da.gov.ph
(+632) 8928 8756 to 65 local 3301 – 3325
ISBN XXX-XXX-XXX-XXX-X (PDF)
www.bafs.da.gov.ph
978-621-441-005-7
PHILIPPINE NATIONAL STANDARD
PNS/BAFS 364:2023
Biogas System — Specifications — Wet Anaerobic
Digestion Process
ICS 65.040.20
ii
Foreword
During the Meeting on the enforcement and regulation of Philippine National
Standards (PNS) held in February 2020, the Bureau of Agricultural and Fisheries
Engineering (BAFE) of the Department of Agriculture (DA) put forth a proposal to
amend the Philippine Agricultural Engineering Standards (PAES) 413:2001
(Agricultural Structures – Biogas Plant). The amendment aims to consider the current
regulation and the existing industry practices, particularly the training regulation of the
Technical Education and Skills Development Authority (TESDA) on biogas plants and
the existing International Organization for Standardization (ISO) standards. As a
response, the DA-Bureau of Agriculture and Fisheries Standards (BAFS)-Standards
Development Division (SDD) included the proposal in the CY 2022 Priority List of
standards for development.
In line with this, the DA-BAFS created a Technical Working Group (TWG) composed
of representatives from relevant DA agencies, other National Government Agencies
(NGAs), academe/research institutions, private sector, and Civil Society Organizations
(CSO) to develop the PNS. The TWG was established under the following Special
Order (SO):
1. SO No. 103, series of 2022 (Creation of Technical Working Groups [TWG] for
the Development of Philippine National Standards [PNS] for Agriculture and
Fishery Products, Machineries, and Infrastructures);
2. SO No. 487, series of 2022 (Addendum to the SO No. 103, Series of 2022
Entitled “Creation of TWG for the Development of PNS for Agriculture and
Fishery Products, Machineries, and Infrastructures”);
3. SO No. 617, series of 2022 (Amendment to SO No. 487, Series of 2022
[Addendum to the SO No. 103, Series of 2022 Entitled “Creation of TWG for
the Development of PNS for Agriculture and Fishery Products, Machineries,
and Infrastructures”]); and
4. SO No. 146, series of 2023 (Creation of TWG for the Development of PNS for
Agricultural and Fishery Products, Machinery, and Infrastructures).
The draft PNS underwent a series of TWG meetings and stakeholder consultations
conducted via blended platforms from June 2022 to June 2023 prior to its endorsement
to the DA Secretary for approval. Throughout these activities, the TWG reached a
consensus to retain the existing PAES 413:2001 (Agricultural Structures - Biogas
Plant). It was further agreed that this particular project would be considered as a
distinct and separate standard. This decision demonstrates a well-balanced approach
that recognizes the significance of the existing standard, PAES 413:2001, while also
accommodating the unique requirements and considerations associated with
advancements in biogas systems.
This PNS was drafted in accordance with the editorial rules of the DA-BAFS-SDD
Standardization Guide No. 1 (Writing the Philippine National Standards).
PHILIPPINE NATIONAL STANDARD
PNS/BAFS 364:2023
Biogas System — Specifications — Wet Anaerobic
Digestion Process
ICS 65.040.20
iii
Table of Contents
Foreword ..................................................................................................................... ii
1 Scope .................................................................................................................. 1
2 Normative References ......................................................................................... 1
3 Terms and Definitions .......................................................................................... 3
4 Classifications ...................................................................................................... 7
4.1 According to capacity (ISO, 2021) ....................................................................... 7
4.2 According to the number of digesters .................................................................. 8
4.3 According to feeding method ............................................................................... 9
5 Location ............................................................................................................... 9
5.1 General considerations ........................................................................................ 9
5.2 Vicinity map ......................................................................................................... 9
5.3 Site development plan ....................................................................................... 10
6 Biogas System Components ............................................................................. 10
6.1 Process block diagram ...................................................................................... 10
6.2 Basic components ............................................................................................. 11
7 Design and Structural Requirements ................................................................. 16
7.1 General design requirements............................................................................. 16
7.2 Masonry ............................................................................................................. 17
7.3 Steel/metal ......................................................................................................... 17
7.4 Rubber and plastic ............................................................................................. 17
7.5 Composite materials .......................................................................................... 18
7.6 Wood/timber ...................................................................................................... 18
8 Construction and Installation Requirements ...................................................... 18
8.1 General .............................................................................................................. 18
8.2 Construction phase ............................................................................................ 18
8.3 Installation requirements .................................................................................... 20
9 Safety Requirements ......................................................................................... 20
9.1 General .............................................................................................................. 20
9.2 Flare .................................................................................................................. 20
9.3 Venting and discharge of hazardous gases ....................................................... 21
9.4 Fire control and mitigation ................................................................................. 21
10 Operation and Maintenance .............................................................................. 22
10.1 Initial loading .................................................................................................... 22
10.2 Mixing slurry for loading ................................................................................... 23
10.3 Loading of slurry and removal of effluent from outlet tank ............................... 23
10.4 Agitation ........................................................................................................... 23
10.5 Entering the digester ........................................................................................ 23
10.6 Servicing scum ................................................................................................ 23
10.7 Periodic cleaning of the digester ...................................................................... 23
10.8 Repairing works within the digester ................................................................. 23
Annex A .................................................................................................................... 25
Annex B .................................................................................................................... 27
Annex C ................................................................................................................... 30
Annex D ................................................................................................................... 32
Annex E .................................................................................................................... 33
Annex F .................................................................................................................... 35
Bibliography ............................................................................................................. 37
PHILIPPINE NATIONAL STANDARD
PNS/BAFS 364:2023
Biogas System — Specifications — Wet Anaerobic
Digestion Process
ICS 65.040.20
1
1 Scope
This Standard specifies the minimum requirements for the design,
construction, components, safety, and operation and maintenance of a biogas
system. This applies to household and non-household biogas systems and
facilities utilizing agricultural, fishery and agro-industrial wastes through a wet
anaerobic digestion process. All biogas systems covered by PAES 413:2001
(Agricultural structures — Biogas plant) are not included in this Standard.
2 Normative References
The following documents are referred to in the text in such a way that some or
all their contents constitute the requirements of this document. The latest
edition of the referenced documents (including any amendments) applies:
Agricultural Machinery Testing and Evaluation Center (AMTEC)-University of
the Philippines Los Baños (UPLB). (2001). Agricultural structures —
Biogas plant (PAES 413:2001). https://amtec.ceat.uplb.edu.ph/wp-
content/uploads/2020/06/PNS-PAES-413-2001-Agricultural-Structures-
Biogas-Plant.pdf
American Society for Testing and Materials (ASTM). (2016). Standard
specification for loadbearing concrete masonry units (ASTM C90).
ASTM. (2017). Standard specification for nonloadbearing concrete masonry
units (ASTM C129).
ASTM. (2019). Standard practice for establishing structural grades and
related allowable properties for visually graded lumber (ASTM D245).
ASTM. (2019). Standard specification for carbon structural steel (ASTM
A36).
ASTM. (2019). Standard specification for high strength structural bolts, steel
and alloy steel, heat treated, 120 ksi (830 MPa) and 150 ksi (1040
MPa) minimum tensile strength, inch and metric dimensions (ASTM
F3125).
ASTM. (2020). Standard specification for deformed and plain carbon-steel
bars for concrete reinforcement (ASTM A615).
ASTM. (2020). Standard specification for pipe, steel, black and hot-dipped,
zinc-coated, welded and seamless (ASTM A53).
ASTM. (2020). Standard specification for steel sheet, zinc-coated
(galvanized) or zinc-iron alloy-coated (galvannealed) by the hot-dip
process (ASTM A653).
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