ISO/TC 275 - Sludge recovery, recycling, treatment and disposal

This method gives a standardized procedure for the conditioning operation when selecting a conditioning product at laboratory scale and also for the production of flocculated thickened sludge for subsequent dewatering tests. This document provides a method for laboratory chemical conditioning of sludge. The method applies to sludges and suspensions from: — storm water handling; — urban wastewater collecting systems; — urban wastewater treatment plants; — industrial wastewater that has been treated similarly to urban wastewater; — water supply plants. This document is applicable to all sludge that can have similar environmental or health impacts, or both, with exclusion of hazardous sludge from industry and dredged sludge.

This document specifies procedures for validating the characterization methods for physical properties of sludge. The method applies to sludges and suspensions from: — storm water handling; — urban wastewater collecting systems; — urban wastewater treatment plants; — industrial wastewater that has been treated similarly to urban wastewater; — water supply plants. In accordance with ISO/TC 275 scope this document is applicable to sludge and products from urban wastewater collection systems, night soil, storm water handling, water supply treatment plants, wastewater treatment plants for urban and similar industrial waters. This document is applicable to all sludge that can have similar environmental and/or health impacts with exclusion of hazardous sludge from industry and dredged sludge.

This document specifies a method for the determination of the gross calorific value of sludge at constant volume and at the reference temperature 25 °C in a bomb calorimeter calibrated by combustion of certified benzoic acid. The result obtained is the gross calorific value of the sample at constant volume with both the water of the combustion products and the moisture of the sludge as liquid water. In practice, sludge is burned at constant (atmospheric) pressure and the water is not condensed but is removed as vapour with the flue gases. Under these conditions, the operative heat of combustion to be used is the net calorific value of the fuel at constant pressure. The net calorific value at constant volume can also be used, equations for the calculation are given only as this requires less additional determinations. This method is applicable to all kinds of sludge.

This document provides information on the processes and technologies for inorganic substance and nutrient recovery from sludge. This document is applicable to sludge and products from urban wastewater collection systems, night soil, wastewater treatment plants for urban and similar industrial waters. It includes all sludge that can have either similar environmental or health impacts, or both. Hazardous sludge from industry and dredged sludge are excluded from this document.

This document establishes requirements and recommendations for the operation of the anaerobic digestion of sludge in order to support safe and sufficient operation of anaerobic digestion facilities to produce to produce sufficient biogas and control by-products qualities. In particular, conditions to optimize mixing within the reactor and appropriate control systems management for safe and reliable operation are described in this document. Performance of the processes in terms of biogas and digestate production are presented depending on type of technologies available on the market. Blending sludge with waste (co-substrate) and mixing the sludge with organic wastes to increase digester loading are also considered. This document is applicable to decision-makers and operators in charge of an anaerobic digestion system.

This document describes good practices for the incineration and other organic matter treatment by thermal processes of sludges. Thermal conditioning is excluded. This document applies to sludges specifically derived from: — storm water handling; — night soil; — urban wastewater collecting systems; — urban wastewater treatment plants; — treating industrial wastewater similar to urban wastewater. It includes all sludge that may have similar environmental and/or health impacts but excludes hazardous sludge from industry and dredged sludge.

This document provides guidance on the conditions of beneficial use of biosolids produced from industrial and municipal sludge and municipal biosolids derived products (e.g. composts, growing media) in the production of food and feed crops, energy crops, forestry crops and for the remediation of disturbed sites. This document applies to biosolids for land application and includes biosolids from wastewater treatment (municipal, industrial and private onsite systems). This document does not apply to hazardous sludge that originates from wastewater which, due to its nature, physical, chemical or infectious properties, is potentially hazardous to human health and/or the environment during use, handling, storage or transportation and which requires special disposal techniques to eliminate or reduce the hazard. This document includes: — general guidelines for the land application of biosolids and biosolids derived products; — specific guidelines for the land application of biosolids and biosolids derived products for food and feed crop production and for non?food and non?feed crop production (e.g. horticulture, fibre for bio?mass, silviculture, etc.); and — specific guidelines for the land application of biosolids and biosolids derived products for other beneficial uses (e.g. land reclamation or rehabilitation).