Nutrient recovery from the digestate obtained by rumen fluid enhanced anaerobic co-digestion of sewage sludge and cattail: Precipitation by MgCl2 and ion exchange using zeolite.

摘要: Abstract The aim of this study was to recover nutrients (NPK and other) from the liquid fraction digestate obtained by rumen fluid enhanced anaerobic co-digestion sewage sludge cattail (Typha latifolia grass). Firstly, digestion (AD) studies were performed examine biogas potential selected substrates. then used in nutrient recovery experiments. Four methods applied nutrients: i) conventional struvite precipitation MgCl2, ii) simultaneous ion exchange Na-zeolite, iii) two-step using precipitation, followed with powdered or iv) granulated Na-zeolite. products characterised different chemical cress seed germination test evaluate their fertility potential. results show that production almost 50 vol%. addition positively contributed degradation lignocellulosic materials production. In all tested, phosphorus successfully recovered efficiency more than 99 wt%. Nitrogen less efficient recovery, 85–92 wt%. Simultaneous lowered nitrogen compared classical while sequential resulted improvement. most method zeolite. precipitates consisted Mg K-phosphates quite irregular shapes. K-struvite detected low quantities. contained 25 wt% macronutrients (NPK), exhibited effective utilization plants, showed good Precipitate mixed Na-zeolite promises be interesting for further agricultural use, as zeolite offers several improvements soil. Both zeolites performance K+ ions.