Overview: full scale experience of the SHARON® process for treatment of rejection water of digested sludge dewatering

2001 ◽  
Vol 44 (1) ◽  
pp. 145-152 ◽  
Author(s):  
R. van Kempen ◽  
J. W. Mulder ◽  
C. A. Uijterlinde ◽  
M. C.M. Loosdrecht
Keyword(s):  
Growth Rate ◽  
Heat Production ◽  
Operating Temperature ◽  
Ph Control ◽  
Active Process ◽  
Sludge Dewatering ◽  
Optimal Operating ◽  
Digested Sludge ◽  
N Removal ◽  
Conversion Rates

A SHARON® system has been constructed at the Utrecht WWTP and at the Rotterdam Dokhaven WWTP. In the SHARON® process rejection water from dewatering of digested sludge is treated for N-removal. It concerns a high active process operating without sludge retention. Due to differences in growth rate nitrite oxidisers can be washed out of the system while ammonia oxidisers are maintained, resulting in N-removal over nitrite. The SHARON® process was selected in competition with several other techniques. The feed of a SHARON® system is concentrated, with ammonia concentrations ranging from 0.5 to 1.5 g N/l. The results show that conversion rates of 90% are well possible with N-removal mainly via the nitrite route. The process was shown to be stable. Due to the high ammonium influent concentrations pH control is of great importance, preventing process inhibitions. The acidifying effect of nitrification can be compensated completely by CO2 stripping during aeration and by denitrification. Heat production by biological conversions is significant, due to the high inlet concentrations, and contributes to the optimal operating temperature of 30-40°C.

Full-scale application of the SHARON process for treatment of rejection water of digested sludge dewatering

2001 ◽  
Vol 43 (11) ◽  
pp. 127-134 ◽  
Author(s):  
J. W. Mulder ◽  
M. C. M. van Loosdrecht ◽  
C. Hellinga ◽  
R. van Kempen
Keyword(s):  
Operating Temperature ◽  
Ph Control ◽  
Full Scale ◽  
Sludge Dewatering ◽  
Digested Sludge ◽  
Highly Active ◽  
N Removal ◽  
Conversion Rates ◽  
First Results ◽  
Sharon Process

At the Rotterdam Dokhaven WWTP the first full-scale application of the SHARON process has been constructed. In the SHARON process, rejection water from dewatering of digested sludge is treated for N-removal. It concerns a highly active process operating without sludge retention. The single tank reactor is intermittently aerated. Due to differences in growth rate nitrite oxidisers are washed out of the system while ammonia oxidisers can be maintained, resulting in N-removal over nitrite. The SHARON process has been selected after comparison with several other techniques. The feed of the SHARON tank is concentrated, with ammonia concentrations over 1 g N/l. The first results show that conversion rates of 90% are quite possible with N-removal mainly via the nitrite route. The process was shown to be stable. Due to the high inlet concentrations pH control is of great importance, preventing process inhibitions. The acidifying effect of nitrification can be compensated completely by CO2 stripping during aeration and by denitrification. Heat production by biological conversions appeared to be significant, due to the high inlet concentrations, and contributes to the optimal operating temperature of 30-40°C.

scholarly journals An Exploration of Seaweed Polysaccharides Stimulating Denitrifying Bacteria for Safer Nitrate Removal

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3390
Author(s):  
Hui Zhang ◽  
Lin Song ◽  
Xiaolin Chen ◽  
Pengcheng Li
Keyword(s):  
Growth Rate ◽  
Bacillus Subtilis ◽  
Nitrate Removal ◽  
Denitrifying Bacteria ◽  
Soil Salinization ◽  
Nitrate Content ◽  
Weak Efficiency ◽  
N Accumulation ◽  
N Removal ◽  
Intensively Managed

Excessive use of nitrogen fertilizer in intensively managed agriculture has resulted in abundant accumulation of nitrate in soil, which limits agriculture sustainability. How to reduce nitrate content is the key to alleviate secondary soil salinization. However, the microorganisms used in soil remediation cause some problems such as weak efficiency and short survival time. In this study, seaweed polysaccharides were used as stimulant to promote the rapid growth and safer nitrate removal of denitrifying bacteria. Firstly, the growth rate and NO3−-N removal capacity of three kinds of denitrifying bacteria, Bacillus subtilis (BS), Pseudomonas stutzeri (PS) and Pseudomonas putida (PP), were compared. The results showed that Bacillus subtilis (BS) had a faster growth rate and stronger nitrate removal ability. We then studied the effects of Enteromorpha linza polysaccharides (EP), carrageenan (CA), and sodium alginate (AL) on growth and denitrification performance of Bacillus subtilis (BS). The results showed that seaweed polysaccharides obviously promoted the growth of Bacillus subtilis (BS), and accelerated the reduction of NO3−-N. More importantly, the increased NH4+-N content could avoid excessive loss of nitrogen, and less NO2−-N accumulation could avoid toxic effects on plants. This new strategy of using denitrifying bacteria for safely remediating secondary soil salinization has a great significance.

Acetone Sensing Properties of NiO Nanofibers Based on Electrospinning

2020 ◽  
Vol 842 ◽  
pp. 231-235
Author(s):  
Xiang Xiang Fan ◽  
Meng Ru Li ◽  
Lan Tian Xie ◽  
Ya Juan Xu ◽  
Wu Ming He ◽  
...  
Keyword(s):  
Operating Temperature ◽  
Diabetic Patients ◽  
Face Centered Cubic ◽  
Optimal Operating ◽  
Working Temperature ◽  
Response Recovery ◽  
Potential Applications ◽  
Response And Recovery ◽  
Face Centered ◽  
P Type

Acetone is a main respiratory marker for diabetic patients. In this paper, P-type NiO nanofibers were prepared by electrospinning and used for the detection of acetone gas. NiO nanofibers were characterized by SEM and XRD. The uniform NiO nanofibers with face-centered cubic structure was obtained. The working temperature of NiO nanofibers was optimized, and the optimal operating temperature is 220°C. The response-recovery curve was tested, and the response and recovery time is 24.6 s and 610 s respectively. The response to different concentrations of acetone was also analyzed, and the detection limit was 100 ppb. These results show that NiO nanofibers based on electrospinning have potential applications in the respiratory testing of diabetes.

Experimental Study on Domestic Sewage Treatment by Biological Aerated Filter

2011 ◽  
Vol 183-185 ◽  
pp. 432-436
Author(s):  
Xia Wang ◽  
Yong Qiang Wu
Keyword(s):  
Sewage Treatment ◽  
Domestic Sewage ◽  
Operating Conditions ◽  
Operating Costs ◽  
Biological Aerated Filter ◽  
Optimal Operating ◽  
Hydraulic Loading ◽  
N Removal ◽  
Aerated Filter ◽  
Water Ratio

On the up-flow biological aerated filter to remove COD and NH3-N were studied the effect and contrast in various stages of finding the optimal operating conditions, so as to achieve energy conservation, the purpose of reducing operating costs. Through experiment studied that the variation of air-water ratio, hydraulic loading, organic concentration in the removal of COD and NH3-N effects, observe and analyse the change of COD and NH3-N removal and the characteristics of microorganisms of filter’s different height. The results showed that COD and NH3-N removal are high under the condition of air-water ratio 4:1~5:1, hydraulic loading 1~2 m3/ (m2●h), organic concentration 300~400 mg/L. The concentration of COD and NH3-N of effluent which are treated by biological aerated filter can meet with second degree discharging standards.

Anaerobic Ammonia Oxidation in Start-Up of Bench Scale ASBR

2014 ◽  
Vol 675-677 ◽  
pp. 633-637
Author(s):  
Ze Ya Wang ◽  
Li Ping Qiu ◽  
Li Xin Zhang ◽  
Jia Bin Wang
Keyword(s):  
Ammonia Oxidation ◽  
Ph Value ◽  
Operating Temperature ◽  
Granular Sludge ◽  
Anaerobic Granular Sludge ◽  
Ammonia Oxidizing Bacteria ◽  
Bench Scale ◽  
N Removal ◽  
Start Up ◽  
Anaerobic Ammonia Oxidation

A set of bench scale ASBR reactors with 0.5 L effective volume were carried out to culture anaerobic ammonia oxidizing bacteria, while the anaerobic granular sludge was inoculated into these reactors as well as the operating temperature is 30±1°C, HRT is 72h and pH is approximate 7.8 in this experiment. After 60 days running, these reactors appeared anaerobic ammonia oxidation phenomenon. When the influent NH4+-N and NO2--N concentrations were approximately 50 mg/L and 70 mg/L, the NH4+-N, NO2--N and TN removal were 80%, 90% and 70%, respectively, the ratio of the NH4+-N and NO2--N removal and NO3--N production is approximately 1:1.5:0.25, close to the theoretical valve of 1:1.32:0.26 and that mainly accord with the chemical equilibrium of anaerobic ammonia oxidation mode. Furthermore, when the phenomenon of anaerobic ammonia oxidation appeared, effluent pH value was slightly higher than influent and the sludge become red.

Multistage treatment wetland for treatment of reject waters from digested sludge dewatering

2013 ◽  
Vol 68 (6) ◽  
pp. 1223-1232 ◽  
Author(s):  
M. Gajewska ◽  
H. Obarska-Pempkowiak
Keyword(s):  
High Efficiency ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Nitrogen Compounds ◽  
High Concentration ◽  
Treatment Wetland ◽  
Sludge Dewatering ◽  
Digested Sludge ◽  
Reed Beds ◽  
Colloidal Fraction

The paper presents the influence of sewage composition on treatment in pilot-scale facility for reject waters (RW) from sewage sludge centrifugation. The facility consisted of mechanical (two tanks with 10 d retention each) and biological parts composed of three subsurface flow reed beds working in batch. Two years of monitoring of the facility proved high efficiency removal of predominant pollutants: chemical oxygen demand (COD) 75–80%, biochemical oxygen demand (BOD) 82.2–95.5% and total nitrogen 78.7–93.9% for low ratio of BOD5/COD in discharged RW. The differences in efficiency removal were correlated with the composition of organics and nitrogen compounds rather than with concentrations. It was assumed that high concentration of colloidal fraction of Org-N and COD in discharged RW led to a decrease in efficiency removal.

scholarly journals The Effect of Ploidy on Growth and Feeding Pattern of Diploid and Triploid Turbot Scophthalmus maximus Under Communal Rearing Condition

2021 ◽  
Vol 21 (06) ◽  
pp. 275-281
Author(s):  
Ilhan Aydin
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Scophthalmus Maximus ◽  
Average Weight ◽  
Feed Conversion ◽  
Farmed Fish ◽  
Conversion Rates ◽  
Significant Difference ◽  
Turbot Scophthalmus Maximus

Triploidy induction is a useful tool to produce sterile fish that prevents interbreeding of farmed fish with wild counterparts. In this study, growth performance and feed conversion rates of 12-months old diploid and triploid turbot that reared both communally and separately for 16 months at constant water temperature determined. At the end of the experiment, diploid, triploid, and communally reared groups reached an average weight of 672.4±21.0 g, 659.2±25.3 g and 660.5±12.0 g, respectively. Any significant differences were not observed in the weight of separately reared diploid and triploid turbot groups. In contrast, triploid fish in the communal group were significantly heavier than diploids at the end of the rearing period. The feed conversion rate of the ploidy group did not show any significant difference between groups. The highest mean specific growth rate was observed in the triploids in communal groups, whereas the diploids in communal groups had the lowest mean specific growth rate. The weight and length gain rates of the groups were similar. Diploid turbot growth appeared to be negatively affected by communal ploidy rearing. The results of the present study indicate that triploid turbot farm escapees may be advantageous in terms of growth in nature.

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