Comprehensive characterization of the liquid fraction of digestates from full-scale anaerobic co-digestion

Akhiar, Afifi; Battimelli, Audrey; Torrijos, Michel; Carrère, Hélène

doi:10.1016/j.wasman.2016.11.005

Cited by 161 publications

(129 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Application of digestates through different processing such as solid liquid separation becomes necessary in many situations to ensure improved handling and management, more efficient transportation and enhanced nutrient recycling opportunities through nutrients concentration. Separated solid and liquid digestates were shown to possess distinct characteristics along with significant variation of nutrient distribution as reported by previous works . The largest variation of properties between solid and liquid fractions was observed for parameters such as ash, dry matter, total NPK, and C distribution .…”

Section: Introductionsupporting

confidence: 76%

Recycling of bioenergy by‐products as crop nutrient: Application in different phases for improvement of soil and crop

Kataki

Hazarika

Baruah

2018

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Recycling of nutrients through soil application of bioenergy by‐products (BEBPs) promotes closing of nutrient cycle as well as solves issues related to their improper management. Present investigation reports experimental data on soil fertility, crop growth (rapeseed), and crop nutrition from application of 15 fertilization treatments comprising of 13 BEBPs treatments, NPK and control. The selected by‐products are three types of digestates from anaerobic digestion namely, (i) cowdung, (ii) co‐digested Ipomoea carnea leaves:cowdung (60:40 dry weight), (iii) co‐digested rice straw:green gram stover:cowdung (30:30:40 dry weight) and one char (Rice husk) from gasification system. Fertilizer potential of digestates are assessed in four application phases namely, whole, separated solid, separated liquid, and ash from solid digestates. Significant variations in soil parameters (pH, EC, soil organic carbon, soil available N, P, and K, soil micronutrients) and crop responses were seen with respect to both feedstock type and application phases. BEBP application particularly in solid and whole phase proved significantly better in improving soil organic carbon. Addition of BEBP resulted in increased aboveground productivity, crop yield, plant NPK concentration compared with BEBP unfertilized condition. Overall, the improvement in grain yield over BEBP untreated control can be related to improvement in soil fertility (available fraction of N, P, and K), organic carbon, pH as well as crop physical growth. This study demonstrated that, due to differential partitioning of nutrients, a differentiated planning of BEBP applications, governed by the nature of feedstock and phase of applications would be required. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13099, 2019

show abstract

Section: Introductionsupporting

confidence: 76%

Recycling of bioenergy by‐products as crop nutrient: Application in different phases for improvement of soil and crop

Kataki

Hazarika

Baruah

2018

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…One of the most important problems with granular sludge reactors is their operation at short settling times, which results in wash-out of sludge from the system. Moreover, most of the organic matter in the liquid phase of digestate is recalcitrant and present in the form of suspended solids and colloids, and as a result, poor organics removal is observed in biological systems [11]. Therefore, to eliminate these disadvantages and ensure high quality effluent, additional treatment steps should be added to increase the final level of purification.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Liquid Phase of Digestate from Agricultural Biogas Plant in a System with Aerobic Granules and Ultrafiltration

Świątczak

Cydzik‐Kwiatkowska

Zielińska

2019

Water

View full text Add to dashboard Cite

Management of digestate from manure co-digestion with a very high chemical oxygen demand (COD) to nitrogen ratio and high nitrogen loads are a major bottleneck in the development of agricultural biogas plants. The liquid phase of digestate mixed with municipal wastewater was treated in aerobic granular sludge batch reactors at cycle lengths (t) of 6 h (GSBR6h), 8 h (GSBR8h), and 12 h (GSBR12h), corresponding to nitrogen loads of 1.6, 1.2, and 0.8 g/(L·d). Thauera sp., Lacibacter sp., Thermanaerothrix sp., and Planctomyces sp. predominated in granules favoring effective granule formation and nitrogen removal. Increasing cycle lengths (t) significantly decreased proteins in soluble fraction of extracellular polymeric substances (EPS) in granules and increased polysaccharides in tightly bound EPS that resulted in higher granule diameters and higher COD removal. In GSBR6h, heterotrophic nitrification/denitrification was very efficient, but ammonium was fully oxidized in the last hour of the cycle. So in further studies, the effluent from GSBR8h was subjected to ultrafiltration (UF) at transmembrane pressures (TMPs) of 0.3, 0.4, and 0.5 MPa. A GSBR8h-UF system (TMP of 0.4 MPa) ensured full removal of total Kjeldahl nitrogen (TKN), suspended solids, and substantial reduction of COD and color with good permeate flux. The NOx-rich (about 250 mg/L), clear permeate can be reused in line with assumptions of modern circular economy.

show abstract

“…In this context, anaerobic digestion (AD) became the main biotechnology for the organic matter exploitation and conversion into biogas. Its success is easily explainable considering the possibility to adopt different typologies of biomasses as raw materials (livestock manure, lignocellulosic biomass, food waste, waste activated, sludge, organic fraction of municipal solid waste (OFMSW), fruit and vegetable waste, industrial waste and bio-waste) and by the management simplicity of this technology [2,3]. The main byproduct of the AD process is represented by the digestate, a solid-liquid mixture containing the biomass and the non-digested recalcitrant organic materials.…”

Section: Introductionmentioning

confidence: 99%

Exploitation of Solar Energy for Ammonium Sulfate Recovery from Anaerobic Digestate of Different Origin

Battısta

Bolzonella

2019

Waste Biomass Valor

View full text Add to dashboard Cite

Digestate represents the semi-liquid byproduct of the anaerobic digestion process. It was estimated that 56 Mtonnes of digestate are annually produced only in Europe. Digestate composition depends on the initial total solids (TS) mixture fed to the digester and by its origin (manure, food wastes, agricultural residues, wastewater sludge). Typical values for the different components include a stabilized organic matter content between 20 and 50 g/L, a good content of nitrogen compounds (2-8 g/kg) and of phosphorous compounds (up to 3 g/kg). In particular, ammonia presence in digestate is interesting for ammonium sulfate production, a fertilizer which favors plants' growth. Traditional ammonium sulfate synthesis is conducted by stripping followed by sulfuric acid absorption, a process which requires high energy and chemicals consumptions. This work investigates the exploitation of solar energy to evaporate the liquid phase of digestate in a lab-scale greenhouse. Digestate vapors, rich in ammonia, are sent in a Drechsler trap, filled with 38% w/w sulfuric acid solution, through three solar air fans. The process has been tested on digestates differing for TS content and origin. It emerged that the process is favored by digestates with high ammonia content, as those originated from manure, and a TS content of about 10% w/w, which allowed to obtain an ammonium sulfate concentration of about 2 M in the final solution. Statement of NoveltyTraditional ammonium sulfate production from digestate requires a previous solid/liquid separation, further polishing of the liquid phase, followed by stripping and absorption in a sulfuric acid solution. This process is characterized by high energy consumption to heat the digestate and by high reagents consumption. This work proposes an innovative and an environmental sustainable way for the ammonium sulfate recovery from digestate, without a previous solid/ liquid separation. In particular, solar energy is exploited to dry the digestate and to recover ammonia vapors, which are sent to a trap containing H 2 SO 4 to allow the ammonium sulfate production.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

show abstract

Comprehensive characterization of the liquid fraction of digestates from full-scale anaerobic co-digestion

Cited by 161 publications

References 37 publications

Recycling of bioenergy by‐products as crop nutrient: Application in different phases for improvement of soil and crop

Recycling of bioenergy by‐products as crop nutrient: Application in different phases for improvement of soil and crop

Treatment of Liquid Phase of Digestate from Agricultural Biogas Plant in a System with Aerobic Granules and Ultrafiltration

Exploitation of Solar Energy for Ammonium Sulfate Recovery from Anaerobic Digestate of Different Origin

Contact Info

Product

Resources

About