AS 1546.3:2017 pdf free download.On-site domestic wastewater treatment units  Part 3: Secondary treatment systems.
1.8.22 Pathogen
A microorganism capable of causing or likely to cause disease.
1.8.23 Performance criteria
Qualitative or quantitative measures or limits which indicate attainment of the performance requirements (see Tables 2.1 and 2.2).
1.8.24 Performance objectives
The design requirements, performance and effluent quality results required for the STS to be acceptable.
1.8.25 Performance requirenients
The functions that an STS has to perform and tests that it has to undergo to verify that the STS can operate as defined by performance criteria.
1.8.26 p11
A number expressing the acidity or alkalinity of a solution on a logarithmic scale on which
7 is neutral, lower values arc more acidic and higher values more alkaline. The p1-I is equal
to —logia[H]. where [H4] is the hydrogen ion concentration in moles per litre.
1.8.27 Premises
An allotment of land including any building situated on it.
1.8.28 Primary treatment
The separation of suspended material from wastewater by settlement and/or tiotation in septic tanks, primary settling chambers, or other structures. In addition to physical separation of solids from liquid, the solids may be decomposed by aerobic or anaerobic microbiological processes and digestion (e.g. anaerobic sludge digestion).
1.8.29 Reedbcds
A sub-surface flow, trickling-filter secondary wastewater treatment system consisting of horizontal layers of particulate material, such as sand and gravel, with macrophytes (generally reeds) planted in the surface layer, following a primary treatment system. Primary treated wastewater is intermittently dosed into pipes in the rcedbed which distribute the flows through the media layers before the wastewater is disinfected and flows into the effluent storage chamber.
1.8.30 Regulatory authority
A state, territory or local government department, agency. body, entity or council
empowered by statute to control the installation, operation and!or acceptance of STS.
1.8.3 1 Sand filter
A sub-surface flow, trickling-filter secondary wastewater treatment system consisting of horizontal layers sand, gravel and/or other particulate media, following a primary treatment system. After primary treatment. wastewater is intermittently disbursed through pipes and flows through the filter layers once (i.e. a ‘single pass’) or is recirculated, before being disinfected and flowing into an effluent storage chamber.AS 1546.3 pdf download.