Details

Autor(en) / Beteiligte

• Shi, W.
• Healy, M.G.
• Ashekuzzaman, S.M.
• Daly, K.
• Leahy, J.J.
• Fenton, O.

Titel

Dairy processing sludge and co-products: A review of present and future re-use pathways in agriculture

Ist Teil von

• Journal of cleaner production, 2021-09, Vol.314, p.128035, Article 128035

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The dairy industry is one of the largest global producers of wastewater and generates huge volumes of dairy processing sludge (DPS). There are two main types of DPS, lime-treated dissolved air floatation sludge and bio-chemically-treated activated sludge. These sludge types may also be converted to STRUBIAS (STRUvite, BIochar, AShes) products which have potential as fertilizers, secondary feedstocks for phosphate fertiliser granules, and soil amendments. A small number of studies indicate that these products have variable nutrient and metal contents, which differ across sludge and STRUBIAS product types. This is due to many factors such as the type of dairy plants, wastewater treatment process and production technologies. Although such products are land applied, the phosphorus (P) and nitrogen (N) fertilizer equivalency value (FEV) are often unknown and not factored into application rates, and therefore need study under field conditions (across soil and crop types). This review identifies a need to quantify antimicrobial drugs, hormones, pesticides, disinfectants, persistent organic pollutants (POPs), microplastics and nano-particles in all DPS and STRUBIAS types. Where detected, testing should follow the transfer of these contaminants to the soil, crop and water continuum. Further knowledge in the areas identified would enable both agronomic and environmental goals to be met and promote higher uptake of DPS and STRUBIAS re-use in agriculture. •DPS and STRUBIAS used in agriculture as bio-fertilizers and soil amendments.•DPS and STRUBIAS applied to crops but without knowledge of their N and P FEV.•Residues of antimicrobial drugs, hormones and pesticides need testing.•Disinfectant and persistent organic pollutant residues need to be characterised.•Quantification of micro-plastics and nano-particles in waste-soil-crop needed.