Phosphorus recovery from pig manure solids prior to land application

Influence of pH on hydrothermal treatment of swine manure: Impact on extraction of nitrogen and phosphorus in process water

“…As a result of the extensive growth in concentrated animal feeding operations in the past decade, large amounts of manure are generated leaving farmers with the challenge of proper waste disposal (Szogi et al, 2015). Treatment facilities emit odorous and volatile compounds such as hydrogen sulphide (H2S), ammonia (NH3) and greenhouse gases (CO2, CH4, N2O, etc.…”

“…As a result this has led to strict environmental legislations for farmers in the EU as well as other countries. The proportion of phosphorus and nitrogen in manure is unequal when compared with industrial fertilisers and hence, excessive application of manure on farmland to meet crop nutrient demand results in higher doses of nutrients beyond those effectively transferred to crops and pastureland, leading to nutrient saturated soils (Szogi et al, 2015). Storing excess manure is a huge challenge to farmers due to odour issues, the high solubility of phosphorus and high degradation rate releasing ammonia (Vadas and Powell, 2013).…”

“…Methods such as immobilization of phosphorus in manure by the addition of aluminium and calcium have been developed to precipitate phosphorus (Wagner et al, 2008). Phosphorus recovered in a concentrated usable form is essential to agriculture as it is a major ingredient in many industrial fertilisers, which are increasingly being produced from non-renewable phosphate rocks (Azuara et al, 2013;Szogi et al, 2015). Anaerobic treatment of pig manure and recovery of phosphorus via struvite precipitation from the digestate has been investigated (Karakashev et al, 2008).…”

Pig slurry composting as a nitrogen source in proso millet crop

“…Water deficit conditions can lead to a reduction in the availability of nitrogen, decreasing the microbial activity and thus the organic N mineralization, which causes low bioavailability and uptake by plants (Wang et al 2013). In situations of water scarcity, a reduction in N availability and other nutrients, such as organic phosphorus, may occur (Szogi et al 2015). In 2013, for the dose of 8.0 Mg ha -1 of PSC, the increase in proso millet grain yield was respectively 37.6 % and 41.98 %, in comparison to the mineral fertilizer and control (Table 2).…”

Grand Challenges in Waste Management in Agroecosystems

“…The recovery of P by precipitation or struvite formation (Martí et al, 2010;Szogi et al, 2015) and recovery of ammonia from wastes by stripping or using gas-permeable membranes (Serna-Maza et al, 2015;Vanotti et al, 2017) to obtain marketable fertilizers are novel processes for animal manure/slurry and sewage sludge treatment that should be developed industrially. In addition, the quality of the products must be guaranteed for their proper marketing.…”