Improvement of sludge settleability in activated sludge plants treating effluent from pulp and paper industries

Andreasen, Kjær; Agertved, Jeanette; Petersen, Jens-Ove; Skaarup, Henrik

doi:10.1016/s0273-1223(99)00721-0

Cited by 12 publications

(1 citation statement)

References 10 publications

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“…O controle do intumescimento do lodo foi estudado por diversos autores, sendo alguns deles, defensores do uso de coagulantes como sulfato ferroso e produtos precipitantes baseados em alumínio, tais como sulfato de alumínio. Outros sustentam a utilização de seletores, a aplicação de surfactantes, a aplicação de cloro, o emprego de clarificadores em série, adição de talco, o controle da temperatura e da carga de lodo e a diminuição da idade do lodo (Andreasen et al 1999;Kitatsuji et al, 1996;Ramirez et al 2000;Clauss et al 1999;Jenkins et al, 2003).…”

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Use of chlorine in the control of filamentous bulking in an activated sludge system from beef industry

Yano¹,

Gomes²

2013

Rev. ambiente água

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There are various processes for treating urban and industrial sewage; the most common is activated sludge. Among the major operational problems is the excessive growth of filamentous microorganisms. The present work aimed to study the initial effects of a dosage of chlorine to control bulking in lab bench scale using a Jar-test. Although results of the monitoring of the treatment effluent system indicate good efficiency, Thiothrix I and Type 0675 bacteria were identified. In the first phase, doses were tested in the return sludge with sodium hypochlorite of 125 g L-1 of active chlorine. A concentration of 25 mg L-1 showed a positive effect after 1 h of sedimentation, breaking the filaments. In the second phase, concentrations of 20 to 27 mg L-1 were tested, relating them to the total suspended solids and settled volume at 1 h. The concentration of 25 mg L-1 showed a positive effect: the total suspended solids of return sludge showed values of 4933 mg L-1 and a settled volume of 947 mL L-1, whereas the control was 943 mL L-1. This concentration helped sedimentation of sludge, but has affected the activities of other microorganisms. A possible explanation for why only high doses had a positive effect on the bacteria could be due to the presence of a sheath that acted as a protective cover against external agents in this species of bacteria

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Section: Introductionunclassified

Use of chlorine in the control of filamentous bulking in an activated sludge system from beef industry

Yano¹,

Gomes²

2013

Rev. ambiente água

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Kombinierte Abwasser‐ und Abluftreinigungsanlage für die Holzwerkstoffindustrie

Portenkirchner¹,

Draxler

Somitsch

et al. 2003

Chemie Ingenieur Technik

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bung gröûere Abweichungen in der Ozonzehrung pro eliminierter SAK-Einheit ausmachen (hier nicht dargestellt). Es kann daraus gefolgert werden, dass die Entfärbung sehr selektiv stattfindet, während die Ozonisierung der Farbstoffmetabolite in gröûerer Konkurrenz zur Reaktion mit der Schlichte steht.Der Vergleich mit der Ozonisierung des Permeats (s. Abb. 3) zeigt, dass trotz der teilweisen Entfärbung in der biologischen Stufe zur chemischen Entfärbung ähnliche Ozondosen wie für den ursprünglichen Farbstoff benötigt werden. Für das Permeat kann eine geringere Abnahme der Absorption bei 595 nm und eine stärkere Abnahme der Absorption im UV-Bereich pro Ozonmenge festgestellt werden. Folglich findet hier neben der Entfärbung auch im gleichen Maûe die Oxidation der anaerob gebildeten Metabolite statt. Inwieweit die anaerobe Vorbehandlung Vorteile bringt, ist nur schwer zu beantworten, da die verbleibende Absorption im UV-Bereich nach der Entfärbung neben der Ozondosis auch von den sonstigen noch vorhandenen organischen Substanzen abhängt.

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Combined Waste Air and Wastewater Treatment Plant for the Wood Panel Industry

Portenkirchner¹,

Draxler

Somitsch

et al. 2003

Engineering in Life Sciences

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In the last few years there has been a dramatic worldwide growth in the production of wood panels and especially of MDF (medium density fiberboard). The environmental aspects of this development have just recently reached the focus of industrial interest due to increasing environmental requirements by the authorities. The development of a new process which should completely close all production site water cycles and minimize the exhaust of air pollutants is reported.

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Improvement of sludge settleability in activated sludge plants treating effluent from pulp and paper industries

Cited by 12 publications

References 10 publications

Use of chlorine in the control of filamentous bulking in an activated sludge system from beef industry

Use of chlorine in the control of filamentous bulking in an activated sludge system from beef industry

Kombinierte Abwasser‐ und Abluftreinigungsanlage für die Holzwerkstoffindustrie

Combined Waste Air and Wastewater Treatment Plant for the Wood Panel Industry

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