Peracetic acid oxidation as an alternative pre-treatment for the anaerobic digestion of waste activated sludge

Appels, Lise; Assche, Ado Van; Willems, Kris; Degrève, Jan; Impe, Jan Van; Dewil, Raf

doi:10.1016/j.biortech.2010.12.070

Cited by 187 publications

(110 citation statements)

References 21 publications

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“…The initial steps of the anaerobic digestion process, that is, hydrolysis of complex compounds and acidogenesis, are mainly effected by saprophytes of the species: Pseudomonas, Bifi dobacterium, Clostridium, Bacteroides, and, to a lesser degree, by Streptococcus and Enterobacterium. Organic acids, alcohols, and ketones, which are formed in the process of acidogenesis in the presence of the bacterial species Synthrophobacter and Synthrophomonas, are further processed to acetate, carbon dioxide, and hydrogen in the process of acetogenesis [3]. The fi nal step of anaerobic digestion consists in the conversion of acetate to CH 4 , H 2 O, and H 2 in the presence of archaea, such as the species Methylomirabilis, Methanosarcina, Methanobacterium, and Methanococcus [4].…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Co-Digestion of Waste Wafers from Confectionery Production with Sewage Sludge

Pilarska

2018

Pol. J. Environ. Stud.

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Food waste (FW) is generated in high volumes and is a serious threat to the environment if utilized improperly or left without control. Conventional methods of FW disposal include combustion, landfi lling, aerobic composting, partial recycling, and other ones. Anaerobic digestion (AD) is the most environmentally friendly of all the methods as it is benefi cial to the populace, and food waste is a suitable material for biogas production.Confectionery waste has rarely been utilized by anaerobic digestion (AD) so far. In this paper, the use of waste wafers (WF) in co-digestion with sewage sludge (SS) is proposed for the fi rst time. Annual volumes of production of WW and SS are expressed in hundreds and thousands of tons, respectively. The materials are generated in high amounts and on an ongoing basis, which is a very important factor regarding potential biogas plant investment projects. The objective of this paper was to analyze the AD process of the test substrates in terms of process stability and biogas capacity. The studies have shown that both the waste wafers as the individual material and with sewage sludge (as the co-substrate) are suitable feedstocks for biogas production. The experiments were carried out for the individual material and for a system with a cosubstrate in the form of raw sewage sludge (SS). In both cases, a digested sewage sludge was used as the inoculum. The studies were performed in a laboratory scale using anaerobic batch reactors under controlled (mesophilic) temperature and pH conditions. The highest yields of biogas and methane were obtained for waste wafers (980. ), than for the wafers (WF). The differences in biogas production for the samples were primarily connected with the substrates' composition, including with the content of readily degradable organic compounds and C/N ratio. The combination of waste wafers with raw sewage sludge has appeared to be benefi cial, as evidenced by the results of microbiological and biochemical analyses. The sample WF_SS was

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Section: Introductionmentioning

confidence: 99%

Anaerobic Co-Digestion of Waste Wafers from Confectionery Production with Sewage Sludge

Pilarska

2018

Pol. J. Environ. Stud.

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“…Possible process phases for continuous peracid dosing in sludge treatment are gravity thickening, transportation to a treatment plant, or after digestion [91,155,156]. In fact, PAA (at 25 g/kg of dry solids) can also be used as a preoxidation agent before anaerobic digestion: solubilization of organic matter, an increase in biogas production by up to 21%, and increased formation of volatile fatty acids were observed [157]. The application of PAA for sludge treatment resulted in readily biodegradable and nontoxic products, and the process did not interfere with sludge humus improvement properties in soil constitution [32,91].…”

Section: Sludgementioning

confidence: 99%

Peracids in water treatment: A critical review

Luukkonen

Pehkonen

2016

Critical Reviews in Environmental Science and Technology

272

122

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Peracids have gained interest in the water treatment over the last few decades. Peracetic acid (CH 3 CO 3 H) has already become an accepted alternative disinfectant in wastewater disinfection whereas performic acid (CHO 3 H) has been studied much less, although it is also already commercially available. Peracids have also been tested for drinking water disinfection, oxidation of aqueous (micro)pollutants, sludge treatment and ballast water treatment, to name just a few examples. The purpose of this review paper is to represent comprehensive up-to-date information about the water treatment applications, aqueous reaction mechanisms, and disinfection byproduct formation of peracids, namely performic, peracetic and perpropionic acids. and PFA have several of the qualities of an ideal disinfectant: toxicity to microorganisms, but not to higher forms of life; effectivity at ambient temperatures; stability and long shelf-life; low corrosivity; deodorizing ability; widespread availability and reasonable cost [12].PAA and PFA are colorless liquids with characteristic pungent odors. Both are thermodynamically unstable and can decompose spontaneously or explode when highly concentrated, heated, under mechanical stress or exposed to catalytic effects of impurities [1,13,14]. The recommended storage temperatures are below 30 and 20°C for PAA and PFA, respectively [6,14]. Longer carbon chain length increases stability, and thus PAA is more stable than PFA [1]. However, the O-O bond dissociation energy of PFA and PAA has been calculated to be similar: 48 kcal/mol [15]. Percarboxylic acids have typically pK a values 3-4 units higher than the parent carboxylic acids [1]. Nonetheless, PFA and PAA are corrosive [16]. ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 3Exposure to PAA and PFA causes irritation and possibly permanent damage to the skin (cutaneous emphysema), eyes and the respiratory system. In the skin contact, 0.2% is proposed as the no-observed-effect concentration (NOEC) for short and medium length exposure [17].When inhaled, airborne concentrations less than 0.16-0.17 ppm (0.50-0.52 mg/m 3 ) are considered to cause no irritation [17,18]. However, higher concentrations are harmful and a case study suggested that PAA could cause occupational asthma [19].The largest users of PAA on a global scale (estimated in 2013) are shown in Fig. 1. Similar numbers are not available for PFA, but it is probably used at significantly lower quantities.The largest user, the food industry, applies PAA as a disinfectant in fresh produce washing water, clean-in-place (CIP) processes, on food processing equipment, and in pasteurizers, to name just a few examples [21,22]. PFA is also a suitable disinfectant in low-temperature refrigerated food processing and storage rooms [23]. In healthcare, PAA is used for instance in Recently, methods to determine the residual PAA from wastewater were compared: the spectrophotometric method using DPD and catalase was recommended for 0.1-0.5 mg/L PAA concentrations and the cerimetric/iodometric titration...

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“…For long-term operation of AD, it is vital to maintain the key parameters within the appropriate range. Anaerobic digestion of organic matter is generally divided into the following steps: hydrolysis, acidogenesis, acetogenesis and methanogenesis (Appels et al, 2011). In the first step, high molecular materials are decomposed to form molecular materials (eg fatty acids, amino acids).…”

Section: Introductionmentioning

confidence: 99%

Utilization of vegetable dumplings waste from industrial production by anaerobic digestion

Pilarska¹,

Pilarski²,

Ryniecki³

et al. 2017

International Agrophysics

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A b s t r a c t. This paper provides the analysis of results of biogas and methane yield for vegetable dumplings waste: dough with fat, vegetable waste, and sludge from the clarifier. Anaerobic digestion of food waste used in the experiments was stable after combining the substrates with a digested pulp composed of maize silage and liquid manure (as inoculum), at suitable ratios. The study was carried out in a laboratory scale using anaerobic batch reactors, at controlled (mesophilic) temperature and pH conditions. The authors present the chemical reactions accompanying biodegradation of the substrates and indicate the chemical compounds which may lead to acidification during the anaerobic digestion. An anaerobic digestion process carried out with the use of a dough-and-fat mixture provided the highest biogas and methane yields.

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Peracetic acid oxidation as an alternative pre-treatment for the anaerobic digestion of waste activated sludge

Cited by 187 publications

References 21 publications

Anaerobic Co-Digestion of Waste Wafers from Confectionery Production with Sewage Sludge

Anaerobic Co-Digestion of Waste Wafers from Confectionery Production with Sewage Sludge

Peracids in water treatment: A critical review

Utilization of vegetable dumplings waste from industrial production by anaerobic digestion

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