Cesar Huiliñir

Cesar Huiliñir
University of Santiago, Chile | USACH · Departamento de Ingeniería Química

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About

94
Publications
12,800
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957
Citations
Additional affiliations
November 2010 - present
University of Santiago, Chile
Position
  • Professor (Full)
Description
  • Professor of Bioreactors Design for Biotechnology Engineering and Chemical Engineering
September 2009 - September 2010
Technische Universität Berlin
Position
  • PostDoc Position
Description
  • PostDoc position developing a new model in WEST software

Publications

Publications (94)
Article
The effect of substrate-inoculum ratio and fly ash (FA) concentration on the anaerobic digestion of winery wastewater was studied. Two substrate-inoculum ratios (0.50 and 1 g soluble COD/g VSS) and five fly ash concentrations (25, 50, 75, 100 and 150 mg/L) were tested under mesophilic conditions. The results showed that 0.50 g soluble COD/g VSS was...
Article
Full-text available
Winery wastewater represents the largest waste stream in the wine industry. This deals with the mineralization of the organic matter present in winery wastewater using anodic oxidation and two types of anodes—namely, a boron-doped diamond electrode (BDD) and two mixed metal oxides (MMO), one with the nominal composition Ti/Ru0.3Ti0.7O2 and the othe...
Article
Full-text available
The aim of this research was to assess the simultaneous effect of zeolite and bischofite on estruvite production in an anaerobic digester treating pig slurry as substrate. Three ratios (5:1, 6:1 and 7:1) of Mg-P were used for evaluating the effect of only bischofite on anaerobic digestion. For assessing the simultaneous effect of zeolite and bischo...
Article
The impact of the organic carbon to nitrate ratio (C/N ratio) on mixotrophic denitrification rate has been scarcely studied. Thus, this work aims to investigate the effect of the C/N ratio on the mixotrophic denitrification when methanol is used as a source of organic matter and elemental sulfur as an electron donor for autotrophic denitrification....
Article
The hydrothermal carbonization (HTC) optimization of oat husk was performed using a response surface methodology. Furthermore, anaerobic digestion (AD) of spent liquor and hydrochar addition were evaluated in the biomethane potential (BMP) test. Results found that temperature influences the most in the studied responses (i.e., mass yield (MY) and h...
Article
Full-text available
This work aimed to achieve partial nitrification (PN) in a Sequencing Moving Bed Biofilm Reactor SMBBR with zeolite as a biomass carrier by using sulfide pulses in the presence of organic matter as an inhibitor. Two conditions were evaluated: sulfide (HS−) = 5 mg S/L and vvm (air volume per liquid volume per minute, L of air L−1 of liquid min−1) =...
Article
The increasing production of fly ash from coal combustion has become a problem due to the environmental risks involved in its disposal. These wastes have a porous structure and contain several transition metal oxides that are active components of many catalytic systems. This document presents the possibility of using fly ash as an additive to impro...
Article
Background Fly ash is an important source of trace elements, which can act as cofactors of enzyme systems and improve anaerobic digestion processes. However, its effect on anaerobic digestion using real wastewater has not yet been studied. In the present work the effect of fly ash on the anaerobic digestion of real winery wastewaters was studied, b...
Article
The evaluation of the nitrification kinetics in the simultaneous presence of sulfide and organic matter using zeolite as improver was the main goal of this work. According to the sensitivity and collinearity analyses, five parameters were the most sensitive in the model, whose calibrated values were: μ max, AOB = 0.02642 ± 0.002 h⁻¹; μ max, NOB = 0...
Article
An expanded granular sludge bed (EGSB) reactor using natural zeolite as support was evaluated for treating synthetic swine wastewaters. The process was operated at 30ᶱC during 255 days in two reactors at laboratory scale. The control reactor (Rc) was operated only with granular sludge while 120 g of zeolite was supplemented additionally in the othe...
Conference Paper
Full-text available
Highlights  Anaerobic digestion of spent liquors from HTC of lignocellulosic waste was studied.  Kinetic analysis of the process through three different models was made.  Spent liquors from pine sawdust obtained the highest methane production.  Modified Gompertz and Chapman models fitted experimental data accurately. Abstract: In this work, the...
Article
The effect of the substrate to inoculum ratio (SIR) on the anaerobic digestion (AD) of the liquid fractions (LFs) of co-hydrothermally treated mixed biomass (sewage sludge (SS) and the organic fraction of municipal solid waste (MSW)) was evaluated. The impact of SS + MSW-hydrochar was also studied at different hydrochar concentrations (0, 1, 5, 10,...
Article
In this work, the spent liquor of pine sawdust (L1), canola oil waste (L2), olive oil waste (L3) and vineyards waste (L4) from hydrothermal carbonization (220 °C, 1 h) process were studied as substrates for biogas production. Kinetic degradation using three kinetic models (Gompertz model, Hill model and Chapman model) was also analyzed. The batch e...
Article
Full-text available
Sulfur compounds are removed from petroleum by the addition of sodium hydroxide at a very high concentration. As a result, a residue called spent soda or spent caustic is generated, being extremely aggressive to the environment. In this work, the chemical properties of this residue are described in detail. The sodium hydroxide remains that have not...
Article
The inclusion of S⁰ hydrolysis in a kinetic model of autotrophic denitrification has been recently proposed; however the model has not been calibrated or validated yet. Thus, a new methodology was developed and applied to calibrate and validate this kinetic model for the first time. An inoculum adapted from a poultry wastewater treatment plant at s...
Article
The anaerobic digestion of organic residues generated from the wine production process was evaluated. Organic residues namely the stalks, pomace, vine shoots and waste-activated sludge (WAS) from the liquid waste treatment plant and wine lees were used as substrates. A physical and chemical characterization of the solid residues was carried out, de...
Article
This review reports the use of zeolites in biological processes such as anaerobic digestion, nitrification, denitrification and composting, review that has not been proposed yet. It was found that aerobic processes (activated sludge, nitrification, Anammox) use zeolites as ion-exchanger and biomass carriers in order to improve the seattlebility, th...
Article
Due to the pollution characteristics of the wastewater generated in piggeries, these waste streams have to be treated before discharging into the environment. These wastes have high content of organic matter, nitrogen and phosphorus that can be converted or recovered into valuable products. The valuation of swine waste by anaerobic digestion has al...
Article
BACKGROUND Some liquid industrial wastes are rich in sulfur (S), nitrogen (N) and organic matter, causing eutrophication of lakes and rivers. These wastes also are highly toxic to aquatic organisms and pose serious health problems. Biological N removal is performed by denitrification. Heterotrophic denitrifiers oxidize organic matter to CO2 gas and...
Article
BACKGROUND The biological nitrification process is inhibited in the presence of sulfide and organic matter (OM). The use of immobilized biomass on inert carriers may help to decrease this inhibition. Thus, the main goal of the present work was to develop a sequencing moving bed biofilm reactor (SMBBR) using zeolite as biomass carrier and to determi...
Article
BACKGROUND Biological activity monitored through the dynamic respiration index (DRI) and the calculation of biological heat generation (Qbio) through O2 consumption has been reported only scarcely in the case of biodrying. Therefore, the present work studies the DRI and Qbio for a dewatered secondary sewage sludge biodrying process under different...
Article
This work explores the effect of two metallic wastes (mining wastes, MW; fly ashes, FA) and micro-aeration (MA) on the anaerobic digestion of wastewater which is rich in sulfate and sulfide. Two initial COD concentrations (5,000 and 10,000 mg/L) were studied under both conditions in batch systems at 35 °C, with a fixed COD/SO4²⁻ ratio = 10, with 10...
Article
A new semicontinuous anaerobic digestion/solar photoelectro-Fenton (SPEF) process for the treatment of slaughterhouse wastewater is studied. An Upflow Anaerobic Sludge Blanket (UASB) reactor was used at two different organic load rates (OLR) (3.94 and 8.15 g COD L⁻¹ d⁻¹), while the SPEF was carried out in a photoelectrochemical reactor using a filt...
Article
Full-text available
Ampicillin (AMP) is an antibiotic widely used in hospitals and veterinary clinics around the world for treating infections caused by bacteria. Therefore, it is common to find traces of this antibiotic in wastewater from these entities. In this work, we studied the mineralization of this antibiotic in solution as well as the elimination of its antim...
Article
BACKGROUND The modeling of anaerobic digestion of sewage sludge including the effect of fly ash has been scarcely studied and has focused mainly on the accumulated methane. The present work was aimed to assess the complete dynamic behavior of the BMP of sewage sludge in the presence of fly ash, including both the liquid and gas phases. The model wa...
Article
The objective of this work was to determine the effect of a controlled micro-aeration as a pretreatment or hydrolytic stage of mixed sewage sludge and the incorporation of solid wastes as a source of trace metals in the anaerobic digestion of this pretreated sludge. Three experimental runs were carried out under the same conditions in laboratory-sc...
Article
The elimination of the antibiotic Nafcillin (NAF), which is usually used in hospitals and veterinary clinics around the world, was assessed through a combination of three advanced electrochemical oxidation processes followed by anaerobic digestion process. In the first stage different electrochemical advanced oxidation processes (EAOPs) were used:...
Article
Even though the nitrification process is inhibited in the presence of sulfide and organic matter, few efforts have been reported to overcome this weakness. The present work has the goal of determining the effect of zeolite (2.5, 5, 10 and 15 g/L) as an improver of the nitrification process in the presence of sulfide and organic matter in a batch sy...
Article
The effect of aerobic pretreatment and fly ash addition on the production of methane from mixed sludge is studied. Three assays with pretreated and not pretreated mixed sludge in the presence of fly ash (concentrations of 0, 10, 25, 50, 250 and 500 mg/L) were run at mesophilic condition. It was found that the combined use of aerobic pretreatment an...
Article
A new bacterial strain with powerful antifungal activity against the phytopathogenic fungus Botrytis cinerea was characterized and identified as Paenibacillus polymyxa SCHC33. The kinetics of bacterial growth was fitted to the Monod model, with μmax = 0.218 h⁻¹, Ks = 0.087g/L, and YX/S = 0.159 g dry biomass/g glucose. The antifungal activity of the...
Article
The behavior of anaerobic digestion in batch and UASB reactors using a microaerobic process and natural zeolites was studied. Laboratory assays were carried out across 4 sets of variables: different COD/SO42- ratios, different airflow levels, with and without natural zeolites and room and mesophilic controlled temperatures. The microaerobic process...
Article
Full-text available
This study proposes a new model of batch biodrying of sewage sludge. This model divided the matrix into two phases (gas and solid), generating 9·N equations which were solved numerically with Matlab software. A sensitivity analysis was also carried out. It was found that the model can represent the experimental trend reported in the literature for...
Article
Full-text available
The calibration and validation of a new model of batch biodrying of sewage sludge is presented. The calibration was carried out with experimental data from the literature, while the validation was carried out with new experimental data. The model was successfully calibrated with experimental data, with the values of parameters falling in the range...
Article
This study evaluated the performance of a micro-aerobic hydrolysis of mixed sludge and its influence as a pretreatment of this waste for its subsequent anaerobic digestion. Three experimental series were carried out to evaluate the optimum micro-aeration levels in the range from 0.1 to 0.5 air volume/min.reactor volume (vvm) and operation times wit...
Article
One of the technologies used for wastewater nitrogen removal consists in simultaneous nitrification–denitrification. The low microbial growth rate and the low availability of organic material for the denitrification stage make it necessary to study new operational conditions and the use of microbial supports. The aim of this study was to evaluate t...
Article
The effect of air flow rate (AFR), pretreatment time, and temperature on a microaerobic pretreatment were determined, including its effect on CH4 generation. For this, four AFR (0.1, 0.3, 0.5 and 1 vvm), three temperatures (20, 25 and 35 °C) and three aeration times (24, 48 and 60 h) were evaluated in 1-L and 5-L bioreactors. The effect on CH4 prod...
Article
The aim of this investigation was to assess the startup and operation of a laboratory-scale hybrid UASB-Anaerobic Filter Reactor (UASFB) of 1 L volume, kept at 30°C, in order to carry out a simultaneous autotrophic and heterotrophic denitrification process. First, the heterotrophic and autotrophic populations were separately enriched, with specific...
Article
Full-text available
In this paper, we review the latest developments in biological methods used in the removal of hydrogen sulphide, present in the liquid phase in anaerobic reactors. The toxicity of H2S to methane-forming microorganisms and the problems caused by the presence of this compound in the biogas generated during this process, as well as the main causes of...
Article
The effect of fly ash on biodegradability and methane production from secondary paper and pulp sludge, including its modeling, was evaluated. Three tests with fly ash concentrations of 0, 10 and 20 mg/L were evaluated at 32°C. Methane production was modeled using the modified Gompertz equation. The results show that the doses used produce a statist...
Article
The simultaneous effect of initial moisture content (initial Mc) and air-flow rate (AFR) on biodrying performance was evaluated. For the study, a 3(2) factorial design, whose factors were AFR (1, 2 and 3 L/min kgTS) and initial Mc (59, 68 and 78% w.b.), was used. Using energy and water mass balance the main routes of water removal, energy use and e...
Conference Paper
En esta investigación se estudió el comportamiento del proceso de digestión anaerobia en presencia de elevadas concentraciones de sulfatos utilizando zeolitas, como material inmovilizador de microorganismos y micro aireación para la conversión del sulfuro de hidrógeno generado durante la anaerobiosis a azufre elemental. Se realizaron estudios en re...
Conference Paper
In this investigation the start-up and operation of a UASB-Anaerobic Filter Reactor (UASFB) of 1 [L], maintained at 30°C, is evaluated in order to carry out the simultaneous autotrophic and heterotrophic denitrification process. The objective is to remove nitrate, thiosulfate and organic matter from synthetic wastewater. First, the heterotrophic an...
Conference Paper
The use of trace amounts of iron, nickel, cobalt and molybdenum maximize anaerobic biodegradability, although, the high cost of these salts limits their use. On the other hand, the fly ash, a residue from thermoelectric power plants, contains the aforementioned elements, which makes it interesting to study their application in the anaerobic digesti...
Article
This study focuses on the kinetics of the biodegradation of volatile solids (VS) of sewage sludge for biodrying under different initial moisture contents (Mc) and air-flow rates (AFR). For the study, a 32 factorial design, whose factors were AFR (1, 2 or 3 L/min kgTS) and initial Mc (59%, 68% and 78% w.b.), was used. Using seven kinetic models and...
Article
Full-text available
Salmon processing generates saline effluents with high protein load. To treat these effluents, three compact tubular filter reactors were installed and an integrated anoxic/anaerobic/aerobic process was developed with recycling flow from the reactor's exit to the inlet stream in order to save organic matter (OM) for denitrification. The reactors we...