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Titolo:
DESIGN CONSIDERATIONS ON PRIMARY SLUDGE HYDROLYSIS UNDER PSYCHROPHILIC CONDITIONS
Autore:
CANZIANI R; POLLICE A; RAGAZZI M;
Indirizzi:
POLITECN MILAN,DIIAR,SEZ AMBIENTALE,PIAZZA LEONARDO DA VINCI 32 I-20133 MILAN ITALY UNIV TRENT,FAC INGN,DICA I-38050 TRENT ITALY
Titolo Testata:
Environmental technology
fascicolo: 7, volume: 17, anno: 1996,
pagine: 747 - 754
SICI:
0959-3330(1996)17:7<747:DCOPSH>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
BIOLOGICAL PHOSPHORUS REMOVAL; WASTE-WATER; SBR DENITRIFICATION; NITROGEN REMOVAL; NUTRIENT REMOVAL; CARBON SOURCE; FERMENTATION; PREPRECIPITATION;
Keywords:
HYDROLYSIS; FERMANTATION; PSYCHROPHILIC; PRIMARY SLUDGE; NUTRIENT REMOVAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
R. Canziani et al., "DESIGN CONSIDERATIONS ON PRIMARY SLUDGE HYDROLYSIS UNDER PSYCHROPHILIC CONDITIONS", Environmental technology, 17(7), 1996, pp. 747-754

Abstract

Wastewater readily-biodegradable COD concentration is a critical parameter affecting biological nutrient removal efficiencies. Primary sludge hydrolysis has been recognized as a viable alternative to increase suspended solids degradability and provide biomasses with an extra load of available substrate. However, fermentation performance strongly depends on both feed sludge characteristics and process conditions. Theaim of this paper is to evaluate the applicability of the process to real wastewater treatment plants operating under psychrophilic conditions. After a short review of previous research, some results of an experimental work are reported in order to explain some of the assumptions made. Then, a simple design procedure for primary fermentation systems is outlined and applied to a general situation. Results indicate that primary sludge hydrolysis at low temperatures (16-20 degrees C) andrecirculation of the separated liquid supernatant allows for little improvements in denitrification efficiencies. Maximum increase in nitrate reduction was estimated to be less than 3% as referred to the totalinfluent nitrogen.

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Documento generato il 24/09/20 alle ore 09:14:06