NSF ANSI 40:2018 pdf download.Wastewater Treatment Systems-Residential wastewater treatment systems.
NSF ANSI 40 contains minimum requirements for residential wastewater treatment systems having rated treatment capacities between 1514 L/day (400 gal/day) and 5678 Llday (1500 gal/day). Management methods for the treated effluent discharged from residential wastewater treatment systems are not addressed by this Standard.
System components covered under other NSF or NSF/ANSI standards or criteria shall also comply with the requirements therein. This Standard shall in no way restrict new system designs, provided such designs meet the minimum specifications described herein.
1.3 Alternate materials, design, and construction
While specific materials, designs. and constructions may be stipulated in this Standard, systems that incorporate alternate materials. designs. or constructions may be acceptable when it is verified that such systems meet the applicable requirements.
1.4 Performance classification
For the purpose of this Standard, systems are classified according to the chemical, biological, and physical characteristics of their effluents as determined by the performance testing and evaluations described herein.
All systems within a manufacturer’s model series may be classified according to the performance testing and evaluation of the system with the smallest hydraulic capacity within the series. Performance testing and evaluation of larger systems within the series (having hydraulic treatment capacities within the scope of this Standard) may not be necessary provided that the dimensions, hydraulics, mixing and filtering capabilities, and other applicable design characteristics are proportionately equivalent to the evaluated system.
2 Normative references
The following documents contain provisions that, through reference in this text, constitute provisions of this Standard. At the time of publication, the indicated editions were valid. All standards are subject to revision, and parties are encouraged to investigate the possibility of applying the recent editions of the standards indicated below.
American Public Health Association (APHA)， American Water Works Association (AWWA) & Water Environment Federation (WEF): Standard Methods for the Examination of Water and Wastewater, 21st Edition, 2005 (hereinafter referred to as Standard Methods)
3 Definitions
3.1 authorized representative: An organization, group, individual, or other entity that is authorized by the manufacturer to distribute. sell, install, or service residential wastewater treatment systems.
3.2 carbonaceous 5 day (5 d) biochemical oxygen demand (CBOD5): The concentration of oxygen (expressed as mgL) utilized by microorganisms in the nonnitrogenous oxidation of organic matter during a 5 d period at a temperature of 20 °C (68 °F).
3.2.1 biochemical oxygen demand (BOO5): The concentration of oxygen (expressed as mg/L) utilized by microorganisms in the oxidation of organic matter during a 5 d period at a temperature of 20 00 (68 °F).
3.3 components: All of the physical, mechanical, and electrical parts that comprise residential wastewater treatment systems.
3.4 data day: Any day in which the daily composite sample has been collected and evaluated, establishing influent and effluent values for CBOD5 and total suspended solids.
3.5 manufacturer: The entity that develops. designs. and produces residential wastewater treatment systems.
3.6 residential wastewater (wastewater): Human body waste and liquid waste generated by the occupants of an individual residence.
3.7 residential wastewater treatment system: An organized and coordinated system of components that functions to treat wastewater generated by individual residences.
3.8 stress recovery: The period of time beginning immediately following completion of a stress loading and ending with the final scheduled sample collection following that stress loading.
3.9 total suspended solids (TSS): The quantity of solids (expressed as mg/L) which can be readily removed from a well-mixed sample with standard laboratory filtering procedures.NSF ANSI 40 pdf download.