Nitrification/denitrification in swine wastewater using porous ceramic sticks with plastic rings as supporting media in two-stage fixed-biofilm reactors

2010 ◽  
Vol 62 (5) ◽  
pp. 985-994 ◽  
Author(s):  
Yen-Hui Lin
Keyword(s):  
Loading Rate ◽  
Porous Ceramic ◽  
Cell Number ◽  
Ammonium Nitrogen ◽  
Nitrogen Loading ◽  
Swine Wastewater ◽  
Final Phase ◽  
Biofilm Reactors ◽  
Removal Efficiencies ◽  
Fixed Biofilm

This study evaluated the performance of oxic-anoxic fixed-biofilm reactors (FBRs) using porous ceramic sticks with plastic rings as supporting media for nitrogen and organic carbon (as COD) removal from swine wastewater. Experimental results indicate that the removal efficiency of NH4+-N increased to 86–92% from 52–98% as the volumetric ammonium-nitrogen loading rate increased to 0.25 kg NH4+-N/m3-d from 0.082 kg NH4+-N/m3-d. Furthermore, during the denitrifying column test, the average removal efficiencies for COD and NOx-N were 83 and 76%, respectively. Only small amounts of NO2−-N and NO3−-N accumulated in the denitrifying FBR. The average values for NO2−-N and NO3−-N in effluent from denitrifying reactor were roughly 2 mg/L and 6 mg/L, respectively. Approximately 82% of NO3−-N was converted into N2 by denitrifying bacteria in the denitrifying FBR. Approximately 98–100% high removal efficiencies of NOx-N could be reached in denitrifying FBR, when the ratio of CODr/NOx-Nr was controlled at 9–12 throughout the test. Microscopic observations show that cell number on the ceramic sticks in denitrifying FBR was greater than that in nitrifying FBR in the final phase of colonization.

scholarly journals Effects of Hydraulic Loading Rate on Nutrients Removal from Anaerobically Digested Swine Wastewater by Multi Soil Layering Treatment Bioreactor

2018 ◽  
Vol 15 (12) ◽  
pp. 2688 ◽  
Author(s):  
Junyuan Guo ◽  
Yuling Zhou ◽  
Yijin Yang ◽  
Cheng Chen ◽  
Jiajing Xu
Keyword(s):  
Loading Rate ◽  
Swine Wastewater ◽  
Nutrients Removal ◽  
Hydraulic Loading Rate ◽  
Hydraulic Loading ◽  
Start Up ◽  
Soil Layering ◽  
Key Factor ◽  
Stable Performance ◽  
Removal Efficiencies

A multi soil layering (MSL) treatment bioreactor was developed aiming at nutrients removal from anaerobically digested swine wastewater (ADSW). The start-up of the MSL bioreactor and its performance in nutrients removal at different hydraulic loading rate (HLR) were investigated. Results showed that the MSL bioreactor was successfully started up after operation for 28 days, and at this time, the removal efficiencies of ammonia-N, total nitrogen (TN) and total phosphorus (TP) in the ADSW reached 63.6%, 58.5%, and 46.5%, respectively. The MSL bioreactor showed a stable performance during the whole working process with varying HLR from 80 to 200 L/(m2·day). Maximum removal efficiencies of ammonia-N, TN and TP were obtained at 160 L/(m2·day), and was appeared as 94.2%, 94.4%, and 92.5%, respectively. It was worth noting that iron scraps were the key factor that enhanced the independent capability of the MSL bioreactor in TP removal, because there was only 21.4–25.8% of the TP was removed when the MSL bioreactor run with no iron addition.

Development of a combined BAC and BZ reactor for removal of nitrogen in wastewater from sludge drying process

1996 ◽  
Vol 34 (1-2) ◽  
pp. 145-151 ◽  
Author(s):  
Fumitake Nishimura ◽  
Isao Somiya ◽  
Hiroshi Tsuno ◽  
Hideki Iwabu
Keyword(s):  
Loading Rate ◽  
Ammonium Nitrogen ◽  
Nitrogen Loading ◽  
Drying Process ◽  
High Concentration ◽  
Biological Activated Carbon ◽  
Biological Reaction ◽  
Loading Ratio ◽  
N Loading ◽  
Sludge Drying

A combined biological activated carbon (BAC) and biological zeolite (BZ) reactor is under development to remove organics and nitrogen from wastewater which contains both inhibitory organics to nitrification and high concentration of ammonium nitrogen. In this study, the combined BAC and BZ reactor was applied to treatment of scrubber-washed wastewater from sludge drying process. Successful treatment performance was accomplished by decreases in concentrations of the inhibitory organics (in BAC tank) and ammonium nitrogen (in BZ tank) occurred by both adsorption to the mediums and biological reaction. Appropriate nitrogen loading rate for fine and stable treatment was shown to be less than 7 mgNOx−-N · (gGAC · d)−1 for denitrification in BAC tank less than 4 mgHN4+-N · (gZeolite · d)−1 for nitrification in BZ tank. DOC/NOx−-N loading ratio to BAC tank is required to be more than 2.0 mgDOC · (mgNOx−-N)−1 for successful denitrification.

scholarly journals Simultaneous Removal of Pollutants and Recovery of Nutrients from High-Strength Swine Wastewater Using a Novel Integrated Treatment Process

Animals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 835
Author(s):  
Soomin Shim ◽  
Arif Reza ◽  
Seungsoo Kim ◽  
Naveed Ahmed ◽  
Seunggun Won ◽  
...  
Keyword(s):  
Treatment Process ◽  
Animal Feed ◽  
High Strength ◽  
Electrochemical Treatment ◽  
Ammonium Nitrogen ◽  
Integrated Treatment ◽  
Swine Wastewater ◽  
Simultaneous Removal ◽  
Farm Scale ◽  
Removal Efficiencies

In this study, a novel treatment approach combining biological treatment, struvite crystallization, and electrochemical treatment was developed and its efficiency for the simultaneous removal of pollutants and recovery of nutrients from high strength swine wastewater (SWW) was verified. For all the parameters, maximum removal efficiencies in the lab-scale test were obtained in the range of 93.0–98.7% except for total solids (TS) (79.4%). Farm-scale process showed overall removal efficiencies for total nitrogen (TN), total phosphorus (TP), soluble total organic carbon (sTOC), and color as 94.5%, 67.0%, 96.1%, and 98.9%, respectively, while TS, suspended solids (SS), ammonium nitrogen (NH4-N), and ortho-phosphate (O-P) concentrations were reduced by 91.5%, 99.6%, 98.6%, and 91.9%, respectively. Moreover, the struvite recovered from SWW showed heavy metal concentrations within the range of the Korean standard for fertilizers and feedstocks and thus, suggesting its potential application as fertilizer and in animal feed production. Using the proposed process, the SWW was converted to liquid compost as a quick-acting fertilizer, struvite as a slow-release fertilizer, and the decolorized and disinfected effluent after electrochemical treatment was safe for discharge according to Korean standard. Therefore, the novel integrated treatment process used in this study can be considered as a solution for SWW management and for the simultaneous removal and recycling of nutrients (N and P).

Factors affecting phosphorus removal in two biofilter system treating wastewater from car-washing facility

2000 ◽  
Vol 41 (4-5) ◽  
pp. 487-492 ◽  
Author(s):  
D. Pak ◽  
W. Chang
Keyword(s):  
Phosphorus Removal ◽  
Phosphorus Content ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Aerobic Condition ◽  
Suspended Solid ◽  
Nitrogen Loading ◽  
Operational Parameters ◽  
Factors Affecting ◽  
Biological Filter

A two-biofilter system operated under alternating anaerobic/aerobic conditions was tested to remove nutrient as well as organics from wastewater generated from car-washing facility. The wastewater was characterized by relatively low organic and high phosphorus content. The factors affecting phosphorus removal in the two-biofilter system were investigated. Operational parameters examined in this study were hydraulic retention time, organic, suspended solid and nitrogen loading rate. The factors affecting phosphorus removal in biological filter appeared to be influent COD, COD/T–P, BOD/COD, nitrogen, and SS/T–P. Nitrite and nitrate produced in the biofilter in aerobic condition affected phosphorus removal by the two-biofilter system. The biomass wasted during backwash procedure also affected total phosphorus removal by the system.

scholarly journals Development of downflow hanging sponge (DHS) reactor as post treatment of existing combined anaerobic tank treating natural rubber processing wastewater

2016 ◽  
Vol 75 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Takahiro Watari ◽  
Trung Cuong Mai ◽  
Daisuke Tanikawa ◽  
Yuga Hirakata ◽  
Masashi Hatamoto ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Loading Rate ◽  
Oxygen Demand ◽  
Nitrogen Loading ◽  
Post Treatment ◽  
Organic Loading Rate ◽  
Anammox Bacteria ◽  
Rrna Gene ◽  
Sequencing Analysis ◽  
Reactor Performance

Conventional aerated tank technology is widely applied for post treatment of natural rubber processing wastewater in Southeast Asia; however, a long hydraulic retention time (HRT) is required and the effluent standards are exceeded. In this study, a downflow hanging sponge (DHS) reactor was installed as post treatment of anaerobic tank effluent in a natural rubber factory in South Vietnam and the process performance was evaluated. The DHS reactor demonstrated removal efficiencies of 64.2 ± 7.5% and 55.3 ± 19.2% for total chemical oxygen demand (COD) and total nitrogen, respectively, with an organic loading rate of 0.97 ± 0.03 kg-COD m−3 day−1 and a nitrogen loading rate of 0.57 ± 0.21 kg-N m−3 day−1. 16S rRNA gene sequencing analysis of the sludge retained in the DHS also corresponded to the result of reactor performance, and both nitrifying and denitrifying bacteria were detected in the sponge carrier. In addition, anammox bacteria was found in the retained sludge. The DHS reactor reduced the HRT of 30 days to 4.8 h compared with the existing algal tank. This result indicates that the DHS reactor could be an appropriate post treatment for the existing anaerobic tank for natural rubber processing wastewater treatment.

Nitrogen removal in a combined system: vertical vegetated bed over horizontal flow sand bed

2001 ◽  
Vol 44 (11-12) ◽  
pp. 137-142 ◽  
Author(s):  
S. Kantawanichkul ◽  
P. Neamkam ◽  
R.B.E. Shutes
Keyword(s):  
Loading Rate ◽  
Low Cost ◽  
Oxygen Demand ◽  
Nitrogen Loading ◽  
Horizontal Flow ◽  
Vertical Flow ◽  
Combined System ◽  
Cost Treatment ◽  
Pig Farm ◽  
Farm Wastewater

Pig farm wastewater creates various problems in many areas throughout Thailand. Constructed wetland systems are an appropriate, low cost treatment option for tropical countries such as Thailand. In this study, a combined system (a vertical flow bed planted with Cyperus flabelliformis over a horizontal flow sand bed without plants) was used to treat settled pig farm wastewater . This system is suitable for using in farms where land is limited. The average COD and nitrogen loading rate of the vegetated vertical flow bed were 105 g/m2.d and 11 g/m2.d respectively. The wastewater was fed intermittently at intervals of 4 hours with a hydraulic loading rate of 3.7 cm/d. The recirculation of the effluent increased total nitrogen (TN) removal efficiency from 71% to 85%. The chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN) removal efficiencies were 95% and 98%. Nitrification was significant in vertical flow Cyperus bed, and the concentration of nitrate increased by a factor of 140. The horizontal flow sand bed enhanced COD removal and nitrate reduction was 60%. Plant uptake of nitrogen was 1.1 g N/m2.d or dry biomass production was 2.8 kg/m2 over 100 days.

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