Anaerobic digestion of animal manure is a potential bioenergy resource that avoids greenhouse gas emissions. However, the conventional approach to use continuously stirred tank reactors (CSTRs) with hydraulic retention times (HRTs) greater than 30 d. Reactors biomass were investigated in this study order increase efficiency process. Filtered pig slurry was used as substrate an expanded granular...

Anaerobic digestion has been proposed as an alternative to the conventional disposal methods of burial, incineration, rendering and aerobic composting. A temperature-phased system consisting of one UASB (at 55 degrees C) and three leach-bed reactors (at ambient temperatures) was tested for its efficiencies in treating poultry mortality. The thermophilic UASB was difficult to start-up. It also s...

Co-digestion has drawn much attention because of its potential to increase biogas production among other benefits. Restaurant grease has high energy content and methane production potential and so is a promising substrate for co-digestion with municipal wastewater sludge. Anaerobic co-digestion of municipal wastewater sludge and restaurant grease was investigated at laboratory-scale under mesop...

The aim of the present work was to evaluate the effect of the carbon/nitrogen (COD/N) ratio on the implementation of technologies treatment of swine wastewater (SW). The results show that the chemical processes are efficient for N removal (up to 99%) contained in SW when COD/N ratio is higher than 10 g/g. However, these processes are inefficient in COD removal (< 33%). COD/N ratio parameter is ...

A study was conducted to assess the performance of anaerobic-aerobic treatment system of a local potato processing industry. The wastewater treatment plant (WWTP) consisted of primary treatment, upflow anaerobic sludge blanket (UASB), activated sludge process (ASP) and secondary clarifier. The study analyzed the physical, chemical and biochemical parameters of the influent (raw sewage) as well ...

In this study, an observer for estimating the state and unknown inputs is proposed monitoring anaerobic digestion processes. This estimator based on a dynamic model considering acidogenesis methanogenesis, consists of three sub-observers: (a) gramian-based fixed-time convergent inlet chemical oxygen demand (COD) acidogenic bacteria population, (b) asymptotic methanogenic (c) super-twisting syst...

Abstract Orange peel is a fruit-based biomass produced in huge quantities worldwide, requiring an appropriate management strategy to meet the waste-to-wealth approach. In current study, this agricultural waste was used (as adsorbent) treat dye-laden wastewater, followed by its regeneration and recyclability for dual biogas biochar production. An adsorbent material prepared mixing orange powder ...

In this study, micro-oxygen was integrated into a rusty scrap iron (RSI)-loaded anaerobic digester. Under an optimal RSI dosage of 20 g/L, increasing O2 levels were added stepwise in seven stages in a semi-continuous experiment. Results showed the average methane yield was 306 mL/g COD (chemical oxygen demand), and the hydrogen sulphide (H2S) concentration was 1933 ppmv with RSI addition. O2 ad...

anaerobic digestion is a feasible technology to stabilize the solid waste generated inslaughterhouses obtaining significant quantities of biogas, considered as a clean and renewable fuel. this iswhy it is important to optimize the digestion process in order to eliminate organic matter and maximize theproduction of biogas. in this work, a system was developed for treating slaughterhouse solid wa...

Thermo-chemical pre-treatment improves the solubilization of the lignocellulosic biomass. Therefore, it could improve biogas production from press mud, the solid residue from sugar cane juice filtration which contains up to 85 % insoluble organic matter. The impact of thermo-alkaline pretreatment conditions (100 o C, Ca(OH)2) on press mud was investigated for different times and concentrations,...