Ammonia-based aeration control with optimal SRT control: improved performance and lower energy consumption

2019 ◽  
Vol 79 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Oliver Schraa ◽  
Leiv Rieger ◽  
Jens Alex ◽  
Ivan Miletić
Keyword(s):  
Energy Consumption ◽  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Ammonia Nitrogen ◽  
Rate Of Change ◽  
Activated Sludge Process ◽  
Total Ammonia Nitrogen ◽  
Supervisory Controller ◽  
Total Ammonia ◽  
Aeration Control

Abstract Ammonia-based aeration control (ABAC) is a cascade control concept for controlling total ammonia nitrogen (NHx-N) in the activated sludge process. Its main goals are to tailor the aeration intensity to the NHx-N loading and to maintain consistent nitrification, to meet effluent limits but minimize energy consumption. One limitation to ABAC is that the solids retention time (SRT) control strategy used at a water resource recovery facility (WRRF) may not be consistent with the goals of ABAC. ABAC-SRT control is a strategy for aligning the goals of ammonia-based aeration control and SRT control. A supervisory controller is used to ensure that the SRT is always optimal for ABAC. The methodology has the potential to reduce aeration energy consumption by over 30% as compared to traditional dissolved oxygen (DO) control. Practical implementation aspects are highlighted for implementation at full scale, such as proper selection of the set point for the supervisory controller, proper calculation of the rate of change in sludge inventory, using a mixed liquor suspended solids (MLSS) controller, and tuning of the controllers. In conclusion, ABAC-SRT is a promising approach for coordinated control of SRT, total ammonia nitrogen, and dissolved oxygen in the activated sludge process that balances both treatment performance and energy savings.

Fish parasites as indicators of organic pollution in southern Brazil

2017 ◽  
Vol 92 (3) ◽  
pp. 322-331 ◽  
Author(s):  
A.C.F. Lacerda ◽  
K. Roumbedakis ◽  
J.G.S. Bereta Junior ◽  
A.P.O. Nuñer ◽  
M.M. Petrucio ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Parasite Species ◽  
First Record ◽  
Organic Pollution ◽  
Ammonia Nitrogen ◽  
Fish Parasites ◽  
Southern Brazil ◽  
Faecal Coliforms ◽  
Total Ammonia Nitrogen ◽  
Total Ammonia

AbstractIncreasing urbanization along riverbanks is a constant source of stressors to the aquatic community, and the use of bioindicators is suitable to detect and monitor the effect of each stressor. We investigated the parasites of the ‘cará’ fish (Geophagus brasiliensis) as potential bioindicators in a river whose banks are subject to increasing anthropogenic pressure. Samples were taken at four points of the Sangradouro River, in Florianópolis, southern Brazil, bimonthly for 12 months. Water temperature, pH, dissolved oxygen, conductivity and salinity were measured at each point and water samples were taken for nutrient analysis (total nitrogen, nitrite, total ammonia nitrogen, total phosphorus, phosphate), and total and faecal coliforms. A generalized linear model (GLM) was constructed using the abundance of each parasite species as the response variable and biometric characteristic of the fish and water variables as possible predictors. Among the 137 fish examined, 114 (83.2%) were parasitized by at least one parasite species. Two species of ectoparasites (Sciadicleithrum guanduensis and Neascus-type metacercariae) and two species of endoparasites (Pandosentis aff. iracundus and Homalometron pseudopallidum) were observed. This is the first record of the genus Pandosentis in Brazilian waters and the first record of the species G. brasiliensis as a host for this parasite. Among the analysed groups of parasites, monogeneans and acanthocephalans proved to be the most sensitive to the concentrations of dissolved oxygen, faecal coliforms and total ammonia nitrogen in the water. Our study suggests that the abundance of both monoxenic and heteroxenous parasites can be negatively affected by organic pollution in the aquatic environment, reinforcing the potential of fish parasites as indicators of water quality.

scholarly journals Study of Biofilter Planted with Basil for Removal of Ammonia in Aquaponic Water

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Bharat Nandkumar Mulay ◽  
Konda Rajasekhar Reddy
Keyword(s):  
Water Quality ◽  
Ammonia Nitrogen ◽  
Quality Parameters ◽  
Coarse Aggregates ◽  
Total Ammonia Nitrogen ◽  
Coconut Husk ◽  
Significant Difference ◽  
Total Ammonia ◽  
Water Recirculation ◽  
Aquaculture Water

Abstract This experimental investigation of a laboratory scale aquaponic system included testing of a biofilter with basil plant as the biofilter part on aquaculture water quality. Irridescent shark was selected as aquaculture species. The biofilter consist of natural biomaterials such as coconut husk, coco peat, and coarse aggregates. The experiment was carried out for three short water recirculation durations of 2, 3, and 4 h/day. The influent and effluent ammonia NH3, total ammonia nitrogen (TAN), nitrites NO2 and nitrates NO3 levels were measured and analysed. The results showed that the biofilter effectively removed NH3 (65 - 71 %), TAN (34 - 58 %), and NO2 (60 - 67 %) from the aquaculture water. The dissolved oxygen (DO) levels were maintained between 3 - 7.0 mg/l during all the recirculation durations. The significance of water recirculation period was assessed by calculating the differences between the means of water quality parameters with a statistical test named one-way analysis of variance (ANNOVA) with significant level P taken as 5 %, i.e., P ≤ 0.5. The effluent mean NH3 levels 0.030 mg/l, 0.033 mg/l, and 0.022 mg/l exhibited significant difference at 4 h/d periods while effluent TAN levels 0.81, 0.77, and 0.77 showed no difference with varying periods.

Total ammonia nitrogen (TAN) removal performance of a recirculating down-hanging sponge (DHS) reactor operated at 10 to 20 °C with activated carbon

Aquaculture ◽  
2020 ◽  
Vol 520 ◽  
pp. 734963 ◽  
Author(s):  
Mamoru Oshiki ◽  
Takashi Aizuka ◽  
Hirotoshi Netsu ◽  
Satoshi Oomori ◽  
Akihiro Nagano ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Ammonia Nitrogen ◽  
Total Ammonia Nitrogen ◽  
Total Ammonia

Micro-PAD card for measuring total ammonia nitrogen in saliva

2020 ◽  
Vol 412 (13) ◽  
pp. 3167-3176 ◽  
Author(s):  
Yanisa Thepchuay ◽  
Raquel B. R. Mesquita ◽  
Duangjai Nacapricha ◽  
António O. S. S. Rangel
Keyword(s):  
Ammonia Nitrogen ◽  
Total Ammonia Nitrogen ◽  
Total Ammonia

scholarly journals Integration between bioflocs and periphyton in Nile tilapia culture tanks

2017 ◽  
Vol 39 (5) ◽  
pp. 601
Author(s):  
Davi De Holanda Cavalcante ◽  
Francisco Roberto Dos Santos Lima ◽  
Vanessa Tomaz Rebouças ◽  
Marcelo Vinícius do Carmo e Sá
Keyword(s):  
Water Quality ◽  
Growth Performance ◽  
Specific Growth ◽  
Ammonia Nitrogen ◽  
Final Body Weight ◽  
Fish Yield ◽  
Beneficial Effects ◽  
Total Ammonia Nitrogen ◽  
Total Ammonia ◽  
Reactive Phosphorus

The present study aimed to assess the possible beneficial effects of the integration between bioflocs and periphyton to the Nile tilapia’s water quality and growth performance. There were four treatments with five replicates each: (1) Control: green waters, (2) Periphyton: substrate-based system, (3) BFT: bioflocs technology for aquaculture, and (4) Biophyton: integration between bioflocs and periphyton. Fish (1.63 ± 0.07 g) were reared for 10 weeks in twenty 250 L outdoor tanks. Two polyethylene boards were vertically set out in the Periphyton and Biophyton tanks as underwater substrates. The C: N ratios of water in the BFT and Biophyton tanks were adjusted to 15:1 with dry molasses applications. The concentrations of total ammonia nitrogen were higher in the Control and Periphyton tanks than in the BFT and Biophyton ones. On the other hand, the concentrations of reactive phosphorus were higher in the BFT and Biophyton tanks than in the Control and Periphyton ones. The fish final body weight, specific growth rate and fish yield have not differed between the tanks. The integration between bioflocs and periphyton has not brought clear benefits to tilapia culture on water quality and growth performance.  

scholarly journals High levels of total ammonia nitrogen as NH4+ are stressful and harmful to the growth of Nile tilapia juveniles - doi: 10.4025/actascibiolsci.v35i4.17291

2013 ◽  
Vol 35 (4) ◽  
Author(s):  
Francisco Jackes Rodrigues da Silva ◽  
Francisco Roberto dos Santos Lima ◽  
Diego Alves do Vale ◽  
Marcelo Vinícius do Carmo e Sá
Keyword(s):  
Nile Tilapia ◽  
Ammonia Nitrogen ◽  
Total Ammonia Nitrogen ◽  
Total Ammonia
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