Studies on Removal of ions and preparation of NaOCl from the industrial RO reject water by electrodialysis

A nitrification/denitrification process was applied to reject water treatment from sludge dewatering at Bottrop central sludge treatment facilities of the Emschergenossenschaft. On-line monitoring of influent and effluent turbidity, closed loop control of DO and pH, and on-line monitoring of nitrogen compounds were combined to a three level control pattern. Though on-line measurement of substrate and product showed substantial response time it could be used to operate nitrification/denitrification within process boundaries.

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Optimising nitrogen recovery from reject water in a 3-chamber bioelectroconcentration cell

Separation and Purification Technology ◽

10.1016/j.seppur.2021.118428 ◽

2021 ◽

Vol 264 ◽

pp. 118428

Author(s):

Veera Koskue ◽

Johanna M. Rinta-Kanto ◽

Stefano Freguia ◽

Pablo Ledezma ◽

Marika Kokko

Keyword(s):

Nitrogen Recovery ◽

Reject Water

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Simultaneous Nitrification and Denitrification in an SBR with a Modified Cycle During Reject Water Treatment

Archives of Environmental Protection ◽

10.2478/aep-2013-0008 ◽

2013 ◽

Vol 39 (1) ◽

pp. 83-91 ◽

Cited By ~ 3

Author(s):

Katarzyna Bernat

Keyword(s):

Batch Reactor ◽

Anaerobic Sludge ◽

Simultaneous Nitrification And Denitrification ◽

Low Oxygen ◽

Total Removal ◽

Operational Conditions ◽

Reject Water ◽

Do Concentration ◽

Nitrification And Denitrification ◽

Low Oxygen Concentration

Abstract In this study, the dependence between volumetric exchange rate (n) in an SBR (Sequencing Batch Reactor) with a modified cycle and simultaneous nitrification and denitrification (SND) efficiency during the treatment of anaerobic sludge digester supernatant was determined. In the SBR cycle alternating three aeration phases (with limited dissolved oxygen (DO) concentration up to 0.7 mg O2/L) and two mixing phases were applied. The lengths of each aeration and mixing phases were 4 and 5.5 h, respectively. Independently of n, a total removal of ammonium was achieved. However, at n = 0.1 d-1 and n = 0.3 d-1 nitrates were the main product of nitrification, while at n = 0.5 d-1, both nitrates and nitrites occurred in the effluent. Under these operational conditions, despite low COD/N (ca. 4) ratio in the influent, denitrification in activated sludge was observed. A higher denitrification efficiency at n = 0.5 d-1 (51.3%) than at n = 0.1 d-1 (7.8%) indicated that n was a crucial factor influencing SND via nitrite and nitrate in the SBR with a low oxygen concentration in aeration phases.

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Use of modelling for optimization and upgrade of a tropical wastewater treatment plant in a developing country

Water Science & Technology ◽

10.2166/wst.2007.675 ◽

2007 ◽

Vol 56 (7) ◽

pp. 21-31 ◽

Cited By ~ 6

Author(s):

D. Brdjanovic ◽

M. Mithaiwala ◽

M.S. Moussa ◽

G. Amy ◽

M.C.M. van Loosdrecht

Keyword(s):

Wastewater Treatment ◽

Developing Country ◽

Wastewater Treatment Plant ◽

Wastewater Treatment Plants ◽

Treatment Plant ◽

Coupled Model ◽

Reject Water ◽

Complex Interactions ◽

N Removal ◽

Discharge Criteria

This paper presents results of a novel application of coupling the Activated Sludge Model No. 3 (ASM3) and the Anaerobic Digestion Model No.1 (ADM1) to assess a tropical wastewater treatment plant in a developing country (Surat, India). In general, the coupled model was very capable of predicting current plant operation. The model proved to be a useful tool in investigating various scenarios for optimising treatment performance under present conditions and examination of upgrade options to meet stricter and upcoming effluent discharge criteria regarding N removal. It appears that use of plant-wide modelling of wastewater treatment plants is a promising approach towards addressing often complex interactions within the plant itself. It can also create an enabling environment for the implementations of the novel side processes for treatment of nutrient-rich, side-streams (reject water) from sludge treatment.

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Nitrogen elimination from sludge treatment reject water – comparison of the steam-stripping and denitrification processes

Water Science & Technology ◽

10.2166/wst.1994.0251 ◽

1994 ◽

Vol 30 (6) ◽

pp. 41-51 ◽

Cited By ~ 12

Author(s):

Burkhard Teichgräber ◽

Andreas Stein

Keyword(s):

Organic Nitrogen ◽

Hydraulic Retention Time ◽

Surface Load ◽

Operational Experience ◽

Sludge Treatment ◽

Reject Water ◽

Total Treatment ◽

Treatment Facilities ◽

Nitrogen Elimination ◽

Denitrification Process

Steam stripping and nitrification/denitrification for the elimination of nitrogen from sludge treatment reject water from the Central Sludge Treatment Facilities (CSTF) of the Emschergenossenschaft in Bottrop were tested in half-scale pilot plants. More than 90% efficiency could be achieved with both systems; the nitrification/denitrification process also removed organic nitrogen. Operational experience has shown that full scale application of both systems is possible. The design surface load of the stripping column has been evaluated as 10 m3/(m2*h) and the steam/water ratio as 0.12 t/m3. The nitrification/denitrification process can be designed for 0.07 kgN/(kg MLSS*d) and 1.4 days hydraulic retention time. Total treatment costs are estimated to be between 5 and 7.5 DM/kg N.

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Uranium Resource Recovery from Desalination Plant Feed and Reject Water Using Amidoxime Functionalized Adsorbent

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.8b04673 ◽

2018 ◽

Vol 57 (50) ◽

pp. 17237-17244 ◽

Cited By ~ 5

Author(s):

Alexander I. Wiechert ◽

Austin P. Ladshaw ◽

Gary A. Gill ◽

Jordana R. Wood ◽

Sotira Yiacoumi ◽

...

Keyword(s):

Resource Recovery ◽

Reject Water ◽

Desalination Plant

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Rapid start-up of one-stage deammonification MBBR without addition of external inoculum

Water Science & Technology ◽

10.2166/wst.2016.406 ◽

2016 ◽

Vol 74 (11) ◽

pp. 2541-2550 ◽

Cited By ~ 3

Author(s):

Linda Kanders ◽

Daniel Ling ◽

Emma Nehrenheim

Keyword(s):

Wastewater Treatment Plants ◽

Full Scale ◽

Anammox Bacteria ◽

Operational Mode ◽

Bacterial Populations ◽

Reject Water ◽

One Stage ◽

Start Up ◽

Laboratory Reactor ◽

Set Up

In recent years, the anammox process has emerged as a useful method for robust and efficient nitrogen removal in wastewater treatment plants (WWTPs). This paper evaluates a one-stage deammonification (nitritation and anammox) start-up using carrier material without using anammox inoculum. A continuous laboratory-scale process was followed by full-scale operation with reject water from the digesters at Bekkelaget WWTP in Oslo, Norway. A third laboratory reactor was run in operational mode to verify the suitability of reject water from thermophilic digestion for the deammonification process. The two start-ups presented were run with indigenous bacterial populations, intermittent aeration and dilution, to favour growth of the anammox bacterial branches. Evaluation was done by chemical and fluorescence in situ hybridization analyses. The results demonstrate that anammox culture can be set up in a one-stage process only using indigenous anammox bacteria and that a full-scale start-up process can be completed in less than 120 days.

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Úsporné odstraňování dusíku procesem anammox z kalových a splaškových odpadních vod

Entecho ◽

10.35933/entecho.2019.04.001 ◽

2019 ◽

Vol 2 (1) ◽

pp. 1-5

Author(s):

Vojtěch Kouba ◽

Jan Bartáček

Keyword(s):

Nitrogen Removal ◽

Low Temperatures ◽

Municipal Wastewater ◽

Pilot Scale ◽

Main Stream ◽

Excess Sludge ◽

Partial Nitritation ◽

Loading Rates ◽

Reject Water ◽

Nitrite Oxidizing Bacteria

Proces částečná nitritace-anammox odstraňuje amoniakální dusík z odpadních vod s polovičními náklady na aeraci, až o 80 % nižší produkcí přebytečného kalu a bez spotřeby organického substrátu. Jde o zavedený proces pro odstraňování dusíku z kalových vod z anaerobní fermentace, a podobně koncentrovaných a teplých odpadních vod. Na tyto vody se částečná nitritace-anammox aplikuje již déle než deset let, a to např. pod názvy ANAMMOX®, ANITA™ Mox, DEMON®, nebo TERRAMOX®. Optimalizované provozy těchto technologií dusík běžně odstraňují při zatížení 0,5–2,3 kg∙m–3∙d–1 (30–35 °C). Současnou výzvou pro výzkum je implementace částečné nitritace-anammox do hlavního proudu studené splaškové odpadní vody, přičemž konkrétními problémy jsou (i) potlačení nežádoucích nitratačních mikroorganismů (NOB) a (ii) adaptace mikroorganismů anammox na nízké teploty. Náš výzkum jsme začali s jednostupňovým procesem, a poté nitritaci a anammox rozdělili do dvou reaktorů. Prezentujeme strategii, která v laboratorním měřítku NOB účinně potlačila i při 12 °C a dále i v pilotním měřítku při 13–30 °C. Dále ukazujeme, že anammox je možné na nízké teploty adaptovat studenými šoky. Tyto výsledky umožní rozšířit úsporné odstraňování dusíku i do hlavního proudu splaškové odpadní vody na ČOV. English: Partial nitritation-anammox (PN/A) process removes nitrogen from wastewater with 50% reduction of aeration costs, 80% less excess sludge and no consumption of organic carbon. PN/A is an established process for the removal of nitrogen from reject water from anaerobic digestion and other similarly warm and concentrated streams. On such wastewater, PN/A has been applied in full scale for over 10 years under names such as ANAMMOX®, ANITA™ Mox, DEMON® or TERRAMOX®, whose optimized installations consistently achieve nitrogen removal loading rates of 0,5–2,3 kg∙m–3∙d–1. The current challenge for research is to implement PN/A into the main stream of cold municipal wastewater, the specific challenges being (i) suppression of undesirable nitrite oxidizing bacteria (NOB) and (ii) adaptation of anammox microorganisms to low temperatures. Our initial experiences with one-stage PN/A in the main stream led us to the separation of PN/A in two subsequent reactors. Subsequently, we developed a strategy for NOB suppression in partial nitritation even under 12 °C, which we then successfully tested in the pilot scale. Furthermore, we found that anammox can be adapted to low temperatures using cold shocks. In sum, these results will enable extending the savings for nitrogen removal into the main stream of wastewater at WWTP.

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