GB/T 4752-2016 in English

Overview of household biogas digester construction standards

GB/T4752-2016 "Household biogas digester construction operation procedures" is an important standard for guiding the construction of rural biogas digesters, replacing the previous GB/T4752-2002. This standard comprehensively regulates the site selection, material selection, construction process and quality acceptance of the digester in combination with the needs of modern agricultural development.

Main features and technological evolution

Compared with the old version of the standard, the new version of the specification has made important adjustments in the following aspects:

• The scope of application has been expanded to cover the construction of different types of digesters.
• The reference dosage table of cyclone distribution digester materials has been added (see Appendix A.2).
• The construction process requirements have been optimized, with special emphasis on the stability and sealing of the concrete cast-in-place digester formwork engineering.
• Added technical specifications for coating sealant construction (Section 8.2) to improve the durability of biogas digesters.

Comparison of standard frameworks

Analysis of key construction technologies

Pot excavation and foundation treatment

The maximum allowable depth of pit excavation is divided into different categories such as no groundwater and artificial fill according to soil type and groundwater conditions (see Table 1). For special foundations, such as quicksand foundations, precipitation measures or relocation and avoidance are required (Section 5.3).

Formwork engineering for cast-in-place concrete pools

Formwork engineering is a key link in concrete construction. The outer formwork preferably uses the pit wall as a natural formwork, and the inner formwork can be steel formwork, wooden formwork or brick formwork (Section 6.1). The formwork support is required to have sufficient strength and rigidity, and must be strictly inspected (6.1.4).

Sealing construction technology

The sealing layer is constructed by a four-layer plastering process, with the specific requirements being as follows:

Implementation suggestions and precautions