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Practitioner's Tool / Anaerobic Baffled Reactor (ABR) 2

1 byte removed, 21:51, 28 September 2016

→‎The Tank

'''Hollow block construction.''' Contractors should first prepare the site by excavating the tank hole to the proper depth plus extra depth to accommodate bedding material, typically 1/4 to 1/3 meter of compacted sand, gravel or aggregate base. Forms are set on top of the bedding material and vertical rebar installed at every other block. Once the floor is poured and set, the block-laying may proceed. Contractors will mortar the blocks in place and use bond beams with horizontal rebar every other row. When all of the blocks are laid, the cells will be filled with grout and allowed to harden. Due to the many joints, some plastering or sealing with tar or mortar on the tank inside is usually required. In high groundwater areas, sealing the outside of the tank to prevent infiltration is beneficial.

'''Poured-in-place tank construction.''' For larger projects, or systems that must support heavy loads, pouring concrete as a monolithic structure is often preferable to concrete blocks. Poured-in-place tanks are started in the same manner as block tanks: first excavate the tank hole with extra depth for bedding material then install the forms and rebar as per the specifications. Baffles and transfer pipes are also set using forms. Note that for extra load-bearing capabilities, thickened columns and slabs are often used. When the forms and steal are in place, pour the concrete and allow it to harden. Concrete will harden to about 90% of its total strength after 7 days, unless additives are used to quicken the hardening. Such concrete mixes, called high-early, may be used when backfilling must be accomplished quickly.

=== Leak Testing and Backfilling Procedures ===

Winona

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