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Standards Development
This second part of the ISO standard sets out the general principles for, and provides guidance on, the quantitative characterization of energy recovery from wastewater and the accounting for it in the total energy consumption calculation of the systems.
The scope of the proposed document includes:
- Definition of the main energy recovery processes applicable in industrial wastewater treatment for reuse, such as anaerobic digestion yielding biogas, or hydro electric power generation from a stream of treated water, or microbial fuel cells or direct heat exchange or other.
- Present the possible forms of energy generated by energy recovery processes and systems, such as electricity or steam or heat, and how to account for intentional wasting or commercial utilization of biogas as a material
- Guide on the value to be taken as quantification of the energy generated for each form, including the power actually generated in average
- Guide on the method to account for the energy generated in design calculations and in measurement
- Providing a method to express a normalized value for recovered energy in accordance with ISO 21939-1
- Providing principles to integrate the energy recovery results with the energy consumption in accordance with ISO 21939-1
All energy production which is not recovered from the wastewater treatment is not within the scope of this standard and shall not be included in the calculations and result expressed by it.
- Energy recovery is an operation encouraged in industrial wastewater treatment
- One of the common ways to recover energy from industrial wastewater treatment is by using Anaerobic Digestion (AD)
- The AD wastewater treatment is characterized by low energy consumption as well as generation of biogas with a high calorific value
- The biogas is often used as an energy source, for generation of heat or electricity or a combination of both (CHP).
- Other processes under development, such as microbial fuel cells, are generally offering the same combination of wastewater treatment and energy production.
- In addition, the treated wastewater at high temperature is sometimes used for heating
- This proposal is a continuation of ISO DIS 21939-1 wherein the energy consumption for the wastewater treatment process is quantified.
- The aim of this PART 2 is to account for energy production where applicable, in order to obtain a net energy value
- The need for standardization results from the different possible uses of the biogas which have different actual energy values as well as the need for standardized expression of this energy value
- The proposed document will define general principles for quantification and accounting for energy recovered in each possible usage of the biogas, and guide on how to integrate these values with the energy consumption of ISO FDIS 21939-1
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