Construction and Start-Up of A High-Rate Wet Weather Treatment Facility in Nashua, New Hampshire

Aerobic upflow sludge blanket(AUSB) process is a new biological wastewater treatment method applying the concept of the self-immobilization to activated sludge. Two sets of AUSB system with different mixing velocities of 3 rpm(R1) and 6 rpm(R2) were operated for high-rate treatment of synthetic wastewater. The COD removal efficiency in R2 was higher than R1 at the same loading rate up to 7 kg/m3·day. However, in R1, the sludge bulking was observed at the end of the experiment. The chocolate colored granules were formed about 5 days after the start-up. The morphological study on the granular sludge consortia was made with both scanning electron and optical microscopes. The granules were 0.5-2.5 mm in diameter and mainly consisted of bacteria with pili-like appendages and filamentous bacteria, which were thought to be Sphaerotilus natans and Beggiatoa. In R1, the long multicellular filaments causing bulking were prevalent in the granule, while in R2 overgrowth of filamentous bacteria was prevented with appropriate shear stress resulting in higher MLSS density. Experimental results indicated that granulation could be controlled by physical stress on granular sludge.

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High Rate Transient Start-Up Flow with Glass Fibres Filled Thermoplastics

Progress and Trends in Rheology V ◽

10.1007/978-3-642-51062-5_92 ◽

1998 ◽

pp. 204-205

Author(s):

Jean L. Leblanc

Keyword(s):

High Rate ◽

Glass Fibres ◽

Start Up

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Septoria cucurbitacearum. [Descriptions of Fungi and Bacteria].

IMI Descriptions of Fungi and Bacteria ◽

10.1079/dfb/20056400740 ◽

1982 ◽

Author(s):

E. Punithalingam

Keyword(s):

New York ◽

North America ◽

Geographical Distribution ◽

New Hampshire ◽

Cucumis Melo ◽

Bryonia Dioica ◽

Water Splash ◽

Vegetable Marrow ◽

Wet Weather ◽

Cucurbita Ficifolia

Abstract A description is provided for Septoria cucurbitacearum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Cucumis melo, C. sativus, Cucurbita ficifolia (=C. melanosperma), C. maxima, C. moschata, C. pepo and Bryonia dioica (=B. cretica). DISEASE: Leaf spot of cantaloupe, cucumber, melon, pumpkin, squash and vegetable marrow. The visible symptoms are circular, olive brown lesions, prominent on the upper surface of the leaves. With the progress of the disease the spots enlarge, usually reaching 3-5 mm diam., occasionally 8 mm wide and soon dry up. Older lesions tend to turn white revealing several pycnidia embedded within the tissue. GEOGRAPHICAL DISTRIBUTION: Africa (Ethiopia, Kenya, Zambia); Australasia & Oceania (Australia); Europe (Bulgaria, Denmark, France, Germany, Hungary, Italy, Portugal, Rumania, USSR); North America (USA, Delaware, Massachusetts, New Hampshire, New York, Pennsylvania, Wisconsin). TRANSMISSION: Presumably by conidia disseminated by water splash in wet weather or heavy dews.

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Stable and high-rate anaerobic co-digestion of food waste and cow manure: Optimisation of start-up conditions

Bioresource Technology ◽

10.1016/j.biortech.2020.123195 ◽

2020 ◽

Vol 307 ◽

pp. 123195 ◽

Cited By ~ 4

Author(s):

Bao-Shan Xing ◽

Sifan Cao ◽

Yule Han ◽

Junwei Wen ◽

Kaidi Zhang ◽

...

Keyword(s):

Food Waste ◽

High Rate ◽

Cow Manure ◽

Start Up

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Biomass Retention in Advanced Anaerobic Reactors

Water Science & Technology ◽

10.2166/wst.1990.0132 ◽

1990 ◽

Vol 22 (1-2) ◽

pp. 17-24 ◽

Cited By ~ 6

Author(s):

G. Albagnac

Keyword(s):

Current Knowledge ◽

Point Of View ◽

High Rate ◽

Efficient Treatment ◽

Anaerobic Reactors ◽

Start Up ◽

Biomass Retention ◽

Rate Processes ◽

Bacterial Aggregates ◽

Bacterial Concentrations

Recognition of the advantages of anaerobic wastewater treatment induced the development of high rate processes, i.e. reactors designed to allow an efficient treatment of even diluted streams. The performance of these advanced reactors is mainly dependent on the retention within the reactor of high bacterial concentrations. The prevailing mechanism is either the formation of bacterial aggregates with good settling characteristics, the development of methanogenic biolayers at the surface of inert carriers or both. During the past decade information on the biology of methanogenic ecosystems became available at an increasing rate. From a practical point of view it can be stated that the biological conversion of organic compounds to methane is reasonably well understood. However the current knowledge on the aggregation and adhesion of methanogenic consortia remains very limited. In most cases reactor start-up procedures are rather long and appear to be more empirical than rational. This paper is a brief presentation on the current knowledge of methanogenic aggregates and biofilms. The fundamental aspects of bacterial adhesion and the modelling of anaerobic biofilms growth are presented elsewhere.

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Rapid start-up of a nitrifying reactor using aerobic granular sludge as seed sludge

Water Science & Technology ◽

10.2166/wst.2012.888 ◽

2012 ◽

Vol 65 (3) ◽

pp. 581-588 ◽

Cited By ~ 8

Author(s):

Naohiro Kishida ◽

Goro Saeki ◽

Satoshi Tsuneda ◽

Ryuichi Sudo

Keyword(s):

Removal Rate ◽

Granular Sludge ◽

Ammonia Removal ◽

High Rate ◽

Aerobic Granular Sludge ◽

Nitrite Accumulation ◽

Ammonia Oxidizing Bacteria ◽

Continuous Stirred Tank Reactor ◽

Start Up ◽

Seed Sludge

In this study, the effectiveness of aerobic granular sludge as seed sludge for rapid start-up of nitrifying processes was investigated using a laboratory-scale continuous stirred-tank reactor (CSTR) fed with completely inorganic wastewater which contained a high concentration of ammonia. Even when a large amount of granular biomass was inoculated in the reactor, and the characteristics of influent wastewater were abruptly changed, excess biomass washout was not observed, and biomass concentration was kept high at the start-up period due to high settling ability of the aerobic granular sludge. As a result, an ammonia removal rate immediately increased and reached more than 1.0 kg N/m3/d within 20 days and up to 1.8 kg N/m3/d on day 39. Subsequently, high rate nitritation was stably attained during 100 days. However, nitrite accumulation had been observed for 140 days before attaining complete nitrification to nitrate. Fluorescence in situ hybridization analysis revealed the increase in amount of ammonia-oxidizing bacteria which existed in the outer edge of the granular sludge during the start-up period. This microbial ecological change would make it possible to attain high rate ammonia removal.

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