What is ISO 21939‑1 - Express energy consumption of industrial wastewater treatment about?
ISO 21939‑1 discusses a method to calculate and express energy consumption of industrial wastewater treatment. ISO 21939‑1 sets out the general principles for, and provides guidance on, the quantitative characterization of the energy consumed by industrial biological wastewater treatment systems.
ISO 21939‑1 includes the following sub-systems of biological treatment system:
- Biological reactors, which might be suspended growth or fixed film processes or a combination thereof, can include anaerobic, anoxic, and/or aerobic tanks and/or zones.
- Solid-liquid separation processes such as sedimentation, flotation, or membrane filtration, are used for clarification of the water before discharge to downstream processes, which can also involve the return of the separated solids as sludge back to the biological reactor
- Any pumps, blowers, and mixers for water circulation, mixing, and air supply in and between the sub-systems listed herein
- Heating or cooling of the water for treatment
Note 1: ISO 21939‑1 does not aim to characterize the treatment pollutants removal performance or process reliability or any other consideration in the selection of a wastewater treatment system.
Note 2: ISO 21939‑1 does not include the following subsystems of the biological treatment system:
- Wastewater feed pumps
- Pre-treatment systems, which for the purposes of this document also include preliminary and primary treatment processes, such as but not limited to, screening, sedimentation, dissolved air flotation, chemical oxidation, oil separation
- Post-treatment processes, such as but not limited to, disinfection, desalination, ion exchange, sludge treatment, and handling systems
- Site lighting or any energy consumption involved in office operation
- Energy recovery from processes such as anaerobic reactors producing biogas
Who is ISO 21939‑1 - Express energy consumption of industrial wastewater treatment for?
ISO 21939‑1 on express energy consumption of industrial wastewater treatment is useful for:
- Urban wastewater collecting systems
- Urban wastewater treatment plants
- Plants treating industrial wastewater similar to urban wastewater
- Water supply treatment plants
- Sanitation department authorities
- Public works department officials
- Government and municipality officials
Why should you use ISO 21939‑1 - Express energy consumption of industrial wastewater treatment?
Biological wastewater treatment is a major process step in many cases of industrial wastewater treatment for reuse.
ISO 21939‑1 aims to create a quantitative measure for universal characterization of the energy consumption for aerobic biological wastewater treatment systems. Such standardization will benefit engineers in the specification of systems and comparison of systems. The need arises especially in consideration of the life cycle cost of a wastewater treatment system.
ISO 21939‑1 defines the sludge raking and scum skimming system drive all biological treatment and intermediate clarifiers, such as in contact stabilization processes, the compressors, circulation pumps, and skimming systems of DAF or DGF processes, and other such electromechanical units serving solid-liquid separation serving the biological treatment system.
