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

JOURNAL OF CLEANER PRODUCTION

卷:314

Review

Shi, W.^1,2  Healy, M. G.²  Ashekuzzaman, S. M.¹  Daly, K.¹  Leahy, J. J.³  Fenton, O.^1,2 

[1] TEAGASC, Environm Res Ctr, Johnstown Castle, Wexford, Ireland

[2] Natl Univ Ireland Galway, Coll Sci & Engn, Civil Engn & Ryan Inst, Galway, Ireland

[3] Univ Limerick, Chem & Environm Sci, Limerick, Ireland

关键词: Dairy processing sludge;    Agriculture;    Emerging contaminants;    Phosphorus recovery;   

DOI  :  10.1016/j.jclepro.2021.128035

来源: Elsevier

【 摘 要 】

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 biochemically-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.

【 授权许可】

Free