Determination of the impact of toxic inflows on the performance of activated sludge by wastewater characterization

Andreadakis, AD; Kalergis, CM; Kartsonas, N; Anagnostopoulos, D

dc.contributor.author	Andreadakis, AD	en
dc.contributor.author	Kalergis, CM	en
dc.contributor.author	Kartsonas, N	en
dc.contributor.author	Anagnostopoulos, D	en
dc.date.accessioned	2014-03-01T02:41:23Z
dc.date.available	2014-03-01T02:41:23Z
dc.date.issued	1997	en
dc.identifier.issn	0273-1223	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30465
dc.subject	Activated sludge	en
dc.subject	Denitrification	en
dc.subject	Nitrification	en
dc.subject	Toxicity	en
dc.subject	Wastewater characterization	en
dc.subject.classification	Engineering, Environmental	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	Ammonium compounds	en
dc.subject.other	Biomass	en
dc.subject.other	Carbon	en
dc.subject.other	Chemical oxygen demand	en
dc.subject.other	Denitrification	en
dc.subject.other	Industrial waste treatment	en
dc.subject.other	Nitrates	en
dc.subject.other	Nitrification	en
dc.subject.other	Precipitation (chemical)	en
dc.subject.other	Toxicity	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	Ammonium uptake rate (AUR) tests	en
dc.subject.other	Nitrates uptake rate (NUR) tests	en
dc.subject.other	Activated sludge process	en
dc.subject.other	ammonia	en
dc.subject.other	carbon	en
dc.subject.other	chloride	en
dc.subject.other	iron salt	en
dc.subject.other	nitrate	en
dc.subject.other	sodium chloride	en
dc.subject.other	activated sludge	en
dc.subject.other	biomass	en
dc.subject.other	chemical oxygen demand	en
dc.subject.other	conference paper	en
dc.subject.other	denitrification	en
dc.subject.other	nitrification	en
dc.subject.other	precipitation	en
dc.subject.other	waste water management	en
dc.title	Determination of the impact of toxic inflows on the performance of activated sludge by wastewater characterization	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1016/S0273-1223(97)00368-5	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0273-1223(97)00368-5	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	A rational approach for the design of the activated sludge process based on wastewater and biomass characterization techniques as applied to the upgrading of the treatment plant of Volos, a city in the central part of Greece, is presented. The study investigates possible nitrification inhibition and carbon inadequacy, due to high salinity, industrial inflows and pre-precipitation by iron salts. The experimentation was carried out by means of batch Ammonium Uptake Rate (AUR) and Nitrates Uptake Rate (NUR) tests. The results show that within the studied range, 900-4000 mg l-1, chlorides did not inhibit nitrification. Contrary to this, the industrial wastewater entering the plant was found to be toxic. With the existing 1.15 ratio of industrial to total wastewater flow a 50% inhibition to the nitrification process was observed, which is higher than the 25-30% inhibition caused by typical domestic sewage. Industrial contributions exceeding 20% resulted in complete inhibition of nitrification. With respect to denitrification it was found that the industrial wastewater provided a suitable source of carbon, without any adverse effects on denitrification. Pre-precipitation removed about 25% of the filtered COD, thus reducing the amount of nitrates which could be rapidly denitrified Design of the biological reactors on the basis of the findings indicate that a significant under-design may result if typical nitrification and denitrification rates obtained from the literature and practice concerning typical domestic sewage are adopted.A rational approach for the design of the activated sludge process based on wastewater and biomass characterization techniques as applied to the upgrading of the treatment plant of Volos, a city in the central part of Greece, is presented. The study investigates possible nitrification inhibition and carbon inadequacy, due to high salinity, industrial inflows and pre-precipitation by iron salts. The experimentation was carried out by means of batch Ammonium Uptake Rate (AUR) and Nitrates Uptake Rate (NUR) tests. The results show that within the studied range, 900-4000 mg l-1, chlorides did not inhibit nitrification. Contrary to this, the industrial wastewater entering the plant was found to be toxic. With the existing 1:15 ratio of industrial to total wastewater flow a 50% inhibition to the nitrification process was observed, which is higher than the 25-30% inhibition caused by typical domestic sewage. Industrial contributions exceeding 20% resulted in complete inhibition of nitrification. With respect to denitrification it was found that the industrial wastewater provided a suitable source of carbon, without any adverse effects on denitrification. Pre-precipitation removed about 25% of the filtered COD, thus reducing the amount of nitrates which could be rapidly denitrified. Design of the biological reactors on the basis of the findings indicate that a significant under-design may result if typical nitrification and denitrification rates obtained from the literature and practice concerning typical domestic sewage are adopted.	en
heal.publisher	Elsevier Science Ltd, Oxford, United Kingdom	en
heal.journalName	Water Science and Technology	en
dc.identifier.doi	10.1016/S0273-1223(97)00368-5	en
dc.identifier.isi	ISI:A1997YG15000006	en
dc.identifier.volume	36	en
dc.identifier.issue	2-3	en
dc.identifier.spage	45	en
dc.identifier.epage	52	en