Potential for nutrient removal by integrated remediation methods in a eutrophicated artificial lake – a case study in Dishui Lake, Lingang New City, China

2014 ◽  
Vol 70 (12) ◽  
pp. 2031-2039 ◽  
Author(s):  
Qiuzhuo Zhang ◽  
Chi Ding ◽  
Varenyam Achal ◽  
Dan Shan ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Removal Rate ◽  
Buffer Zone ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Water Remediation ◽  
Water Diversion ◽  
Artificial Lake ◽  
Removal Rates ◽  
Remediation Technology ◽  
New City

A new integrated water remediation technology, including a floating bed, a buffer zone of floating plants, enclosed ‘water hyacinth’ purification, economic aquatic plants and near-shore aquatic plant purification, was used in Dishui Lake to improve its water quality. A channel of 1,000 m length and 30 m width was selected to implement pilot-scale experiments both in the static period and the continuous water diversion period. The results showed that the new integrated water remediation technology exhibited the highest removal rate for permanganate index in a static period, which achieved 40.6%. The average removal rates of total nitrogen (TN), ammonia nitrogen (NH3-N) and total phosphorus (TP) in a static period were 23.2, 21.6 and 19.1%, respectively. However, it did not exhibit an excellent removal rate for pollutants in the continuous water diversion period. The average removal rates for all pollutants were below 10%. In winter, the new integrated remediation technology showed efficient effects compared to others. The average removal rate for CODMn, TN, NH3-N and TP were 7, 5.3, 7.6 and 6.5%, respectively. Based on our results, the new integrated water remediation technology was highly efficient as a purification system, especially during the static period in winter.

COD and NH4-N Removal in Two-Stage Batch-Flow Constructed Wetland

2013 ◽  
Vol 448-453 ◽  
pp. 604-607 ◽  
Author(s):  
Hong Jie Sun ◽  
Xin Nan Deng ◽  
Rui Chen
Keyword(s):  
Constructed Wetland ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Two Stage ◽  
Removal Rates ◽  
N Removal ◽  
Domestic Wastewater Treatment

Research was conducted on pilot-scale, two-stage batch-flow constructed wetland systems for domestic wastewater treatment. Synthetic domestic wastewater was treated in a pre-acidification reactor with a hydraulic retention time (HRT) of 3 hours and the average removal rate of chemical oxygen demand (COD) and ammonia-nitrogen (NH4-N) reached 30% and 13.6%, respectively. The first-stage constructed wetland operated with up-flow and batch feed and drain. One cycle was 12h, including 6h feed and 6h drain. With HRT of 3 days, the effluent COD concentrations fluctuated from 32.5 mg/L to 103.4 mg/L, removal rates varied from 60% to 88%; effluent NH4-N concentrations were in the range of 4.8 mg/L to 10.8 mg/L, removal rates varied from 50% to 70%. The second-stage constructed wetland operated with down-flow, which one cycle was 24h, including 12h feed and 12h drain. With HRT of 1 day, effluent COD concentrations varied from 15.7 mg/L to 48.7 mg/L, removal averaged 53.2%; effluent NH4-N concentrations ranged from 0 mg/L to 0.4 mg/L, average removal exceeded 99%. The spatial variation of COD and NH4-N in the first-stage constructed wetland demonstrated that entrainment of air during draining of constructed wetland could strengthen the removal of COD and NH4-N. Temperature had no significant effect on COD degradation while obviously affected the removal of NH4-N.

An Experimental Study on Compatible Solute Ectoine Dosing of High Salinity Wastewater

2014 ◽  
Vol 955-959 ◽  
pp. 1907-1910
Author(s):  
Su Chen ◽  
Lei Chao ◽  
Ning Chen ◽  
Lin Shan Wang ◽  
Xue Shao ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Waste Treatment ◽  
High Salinity ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Ammonium Nitrogen ◽  
Treatment Efficiency ◽  
Removal Rates ◽  
Cod Removal Rate ◽  
Salinity Wastewater

When the reactor is added with ectoine of concentrations of 0, 0.1, 1 and 10 mmol/L, the impacts on brine waste treatment efficiency are investigated. The results show that the outflow COD and ammonia nitrogen removal rates are the highest, when the ectoine concentration is 0.1 mmol/L. The brine waste treatment efficiency under addition of ectoine of 1 and 10 mmol/L is even worse than that without ectoine addition. It can be preliminarily determined that the best ectoine dosage is in between 0.1-1.0 mmol/L. When ectoine concentrations added in reactors are 0.2, 0.5, 0.8 and 1.0 mmol/L, the results show that the average reactor outflow COD and ammonia nitrogen removal rates are increased compared with those of reactor without adding ectoine. But when ectoine of 1.0 mmol/L is added, the outflow COD and ammonia nitrogen removal rates decrease. When ectoine dosage is 0.5 mmol/L, the reactor outflow COD and ammonia nitrogen values are the lowest, the removal rates are the highest, the average COD removal rate is 74.46%, and the average ammonium nitrogen removal rate is 54.97%. Compared with reactor without adding ectoine, COD and ammonium nitrogen removal rates are increased by 13.16% and 26.81%. Therefore, the best dosage of ectoine is 0.5 mmol/L.

Removal of Ammonia Nitrogen by Combining the Ammonia Stripping with Electrochemical Oxidation

2013 ◽  
Vol 664 ◽  
pp. 454-457
Author(s):  
Xiu Juan Yu ◽  
Li Hong Ning
Keyword(s):  
Synergistic Effect ◽  
Electrochemical Oxidation ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Electrolysis Time ◽  
Removal Rates ◽  
Ammonia Stripping ◽  
Oxidation Technology ◽  
Simulated Wastewater

The removal of ammonia nitrogen in simulated wastewater with 90mg/L NH4Cl was researched by ammonia stripping, electrochemical oxidation and the combination of the ammonia stripping and electrochemical oxidation. It is shown that the reduction of ammonia is enlarged with increasing of wastewater’s alkalinity during stripping. And the removal rates of ammonia nitrogen are 2.1% at pH2 and 43.1% at pH7 which is not related to the stripping time. The ammonia removal is higher efficiency in pH12 which is in the range of 45.1% and 61.4% when the stripping time is changed from 40 to 100 min. The removal rate of ammonia nitrogen is increased with the extension of electrolysis time by the way of the electrochemical oxidation. For 100min electrolysis, the ammonia removal in the cathodic and anodic compartments are 55.8% and 86.9%, respectively. Moreover, by using the ammonia stripping and electrochemical oxidation simultaneously, the ammonia removal in the cathodic and anodic compartments are up to 91.8% and 99.8% for 100min, respectively. The combining of the ammonia stripping with electrochemical oxidation technology has obviously synergistic effect in purifying ammonia nitrogen wastewater.

scholarly journals Characteristics of Ammonia Removal and Nitrifying Microbial Communities in a Hybrid Biofloc-RAS for Intensive Litopenaeus vannamei Culture: A Pilot-Scale Study

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3000
Author(s):  
Wujie Xu ◽  
Yu Xu ◽  
Haochang Su ◽  
Xiaojuan Hu ◽  
Keng Yang ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Litopenaeus Vannamei ◽  
Removal Rate ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Shrimp Culture ◽  
Recirculating Aquaculture ◽  
Total Ammonia ◽  
High Feed

Ammonia is the main pollution factor of the aquatic environment in marine shrimp culture systems. In order to demonstrate the feasibility of the combination of biofloc technology and nitrifying biofilter for the ammonia removal, a 70-day production trial was conducted in a simplified pilot-scale hybrid biofloc-based recirculating aquaculture system (biofloc-RAS) with the intensive culture of Litopenaeus vannamei. Nitrogen dynamics and nitrifying microbial communities were investigated in three replicated systems simultaneously under the conditions of high feed loading and zero water exchange. Along with biofloc development in the culture tank and biofilm formation in the nitrifying biofilter during the trial, nitrification could be fastly and effectively established in the system, which was indicated by the dynamics of total ammonia nitrogen (TAN), NO2–-N, NO3–-N, and total nitrogen (TN) concentrations. Meanwhile, similar nitrifying microorganisms could be found between biofloc and biofilm, despite some differences in abundance, diversity, and composition of ammonia-oxidizing archaea and bacteria and nitrite-oxidizing bacteria. High TAN removal rate could be achieved and was significantly and positively correlated with abundances of these nitrifying microbial communities in both biofloc and biofilm, further indicating that both biofloc and biofilm could contribute highly to nitrification performance of the biofloc-RAS. The results of this study indicate a potential application of the biofloc-RAS in coastal intensive aquaculture.

Effect of Temperature on Enhanced Treatment of Sewage from Discharging Points of Rivers by Biofilm Process Dosing with Enzyme

2011 ◽  
Vol 243-249 ◽  
pp. 3747-3750
Author(s):  
Gai Mei Guo
Keyword(s):  
Removal Rate ◽  
Ammonia Nitrogen ◽  
The Other ◽  
Effect Of Temperature ◽  
Optimal Temperature ◽  
Removal Rates ◽  
Promotion Effect ◽  
Research Results ◽  
Other Hand ◽  
Biofilm Process

The research studied enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme and promotion effect of enzyme on treatment of sewage by biofilm process, and investigated the changes of removal rates of the main pollution indexes at different temperature to ensure the optimal temperature. The research results indicated that temperature was an important factor influencing the removal rates of the main pollution indexes. When temperature was in the range of 5°C-8°C, the promotion effects of enzyme on the removals of CODCrand ammonia nitrogen (NH3-N) of sewage by biofilm process were not obvious. However when temperature were in the ranges of 15°C -18°C and 22°C -25°C, enzyme had the high promotion effects on the removals of the pollution indexes. Furthermore, within the certain temperature (5°C -25°C), the removal rates of CODCrand NH3-N were on the rise with the increase of temperature. When temperature increased from 5°C -8°C to 15°C -18°C, the removal rate of CODCrobviously increased, but when temperature continued to increase to 25, the rise trend of the removal rate of CODCrbecame slow. On the other hand, when temperature increased from 5°C -8°C to 22°C -25°C, the increase of the removal rate of NH3-N was always evident. Therefore, the optimal temperature was in the range of 22°C -25°C for the enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme.

Influence of Flow Field on Simultaneous Removal of Nitrogen and Carbon by Membrane Aerated Biofilm Reactor

2014 ◽  
Vol 694 ◽  
pp. 372-376
Author(s):  
Nan Zhang ◽  
Yun Wu ◽  
Hong Wei Zhang ◽  
Hui Jia
Keyword(s):  
Removal Rate ◽  
Ccd Camera ◽  
Ammonia Nitrogen ◽  
Biofilm Reactor ◽  
Simultaneous Removal ◽  
Circulation Flow ◽  
Electron Microscopic ◽  
Removal Rates ◽  
Flow Rates ◽  
Biofilm Thickness

The characteristics of removing COD and nitrogen simultaneously in membrane aerated biofilm reactor (MABR) was investigated in different packing densities and circulation flow rates. The results show that better removal rates of COD and ammonia nitrogen are found under the packing density of 30%, which removal rates are 76% and 65% respectively. Observations through the electron microscopic and CCD camera reveal that the biofilm have a layered structure and the stable biofilm thickness is 1.652 mm. When the circulation flow rate is 7.62 L·min-1, the highest removal rate of total nitrogen is 70%, meanwhile, the efficient mass transfer of the biofilm is ensured.

Experimental Study on Ammonia-Nitrogen Removal in Water by Composite Zeolite Filter

2013 ◽  
Vol 830 ◽  
pp. 323-326 ◽  
Author(s):  
Li Sha Fan ◽  
Yan Zhen Yu ◽  
Chun Hui Zhao
Keyword(s):  
Removal Rate ◽  
Nitrogen Adsorption ◽  
Filter Material ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Wastewater Discharge ◽  
Operation Condition ◽  
N Concentration ◽  
N Removal ◽  
Start Up

Using composite zeolite filter material independent preparation in the laboratory as an aeration biological filter material,and compared with ceramsite.The ammonia-nitrogen adsorption capacity of the above two filters were evaluated through the pilot test. The start-up of pilot scale CBAF (BAF filled with compound filter material) showed that the average NH4+-N removal rate of the first 5 days was 52.36% when the average influent NH4+-N concentration was 37mg/L. In steady operation condition, the average NH4+-N removal rate reached 83.51% and the average effluent NH4+-N concentration was 5.81mg/L, which could meet the first degree of national wastewater discharge standard (GB 8978-1996).

Nitrogen removal during leachate treatment: comparison of simple and sophisticated systems

2004 ◽  
Vol 50 (6) ◽  
pp. 45-52 ◽  
Author(s):  
J.-L. Vasel ◽  
H. Jupsin ◽  
A.P. Annachhatre
Keyword(s):  
Removal Rate ◽  
Low Cost ◽  
Operating Time ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Full Scale ◽  
Leachate Treatment ◽  
Batch Mode ◽  
Treatment Comparison

Membrane bioreactors (MBR) have become common in treating municipal wastewaters. Applied to leachates treatment MBR were also successful with pilot scale experiments and full-scale facilities as well. We succeeded previously in designing an efficient nitrificationÐdenitrification process with an ethylene glycol byproduct as carbon source for denitrification. Moreover, an unexpectedly high inert COD removal efficiency was also observed in the full-scale MBR facility thereby making it possible to increase the operating time of the final GAC (Granulated Activated Carbon) adsorber. Since MBR are very sophisticated systems. Simpler and “lower” cost systems can also be considered. For example it is possible to nitrify leachates from sanitary landfill using a simple infiltrationÐpercolation technique with a low energy cost. To validate previously published laboratory experiments, a semi industrial-scale pilot installation was installed at the Montzen landfill site (Belgium). The process is based on infiltrationÐpercolation through a granular bed. This well known process was modified to increase the load, notably by changing the support medium, adding an electric fan that is run intermittently and maintaining temperatures greater than 15°C. The new material is a type of granular calcium carbonate with a large specific surface area. These technical improvements enabled the system to nitrify up to 0.4 kg NH4+-N/m3 of reactor bed per day at a hydraulic load of 0.35 m.d-1, with an ammonia removal rate in the range of 80 to 95%. Despite the high ammonia nitrogen inlet concentrations, this system exhibits remarkable nitrification efficiency. Moreover, these performances are achieved in a batch mode system without recirculation or dilution processes. If complete nitrification is needed, it can be obtained in a second in series of bioreactors. The system can be classified as a low cost process. An international patent is pending. Possible performances of those systems were compared with the usual methods for leachates treatment.

A Pilot-Scale Study on Start-Up and Operation of Biofilter with Composite Media

2013 ◽  
Vol 361-363 ◽  
pp. 730-735 ◽  
Author(s):  
Dao Ji Wu ◽  
Yan Jie Wang ◽  
Xue Dong Zhai ◽  
Xiao Xiang Cheng
Keyword(s):  
Activated Carbon ◽  
Quartz Sand ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Pilot Scale ◽  
Carbon Composite ◽  
Ammonia Nitrogen ◽  
N Accumulation ◽  
Good Ability ◽  
Start Up

According to the characteristic of high ammonia nitrogen concentration of Huaihe River in winter, a pilot-scale test was studied in this paper. This paper compared the start-up and operation performance of zeolite biofilter, quartz sand + activated carbon biofilter and zeolite + activated carbon composite biofilter in lower temperature. The results show that three kinds of biofilters for NH4+-N have high remove effects. Average removal rate of zeolite biofilter, quartz sand + activated carbon biofilter, zeolite + activated carbon composite biofilter for NH4+-N were 73%,64% and 78% and effluent NH4+-N concentration were 0.31mg/L,0.24mg/L,0.21mg/L. Average CODMn removal rate of three kinds of biofilters were 5%,13% and 28%. Zeolite + activated carbon composite biofilter does not exist to NO2-N accumulation phenomenon and showed good ability to start-up and running.

Comparative study of domestic wastewater treatment efficiencies between facultative pond and water spinach pond

1995 ◽  
Vol 32 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Seni Karnchanawong ◽  
Jaras Sanjitt
Keyword(s):  
Growth Rates ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Organic Content ◽  
Water Spinach ◽  
Removal Rates ◽  
Mass Removal ◽  
Loading Rates ◽  
Tropical Conditions ◽  
Average Water

Two pilot-scale studies were comparatively conducted under tropical conditions during December 1992 to September 1993. One study involved facultative ponds(FP) and the others water spinach ponds(SP). Four rectangular concrete ponds, 0.8 m × 2.4 m × 1.1 m (width × length × depth), were employed to treat the Chiang Mai University campus wastewater. Water spinach (Ipomoea aquatica) was planted in two of the ponds. The influent characteristics noted showed a low organic content, i.e. BOD 25.4-29.9 mg/l, with BOD:N ratio around 1:1. The investigations were conducted using the following hydraulic retention times (HRT): 1.6, 2, 2.7, 4, 8 and 16 d. The results showed that the BOD, COD and SS mass removal rates increased as the mass loading rates increased and the SP was significantly more effective in reducing the organic content than the FP. No relationship was found between TN mass removal and the loading rates. However, the TP mass removal rates in the SP and the FP were rather low and were considered to be insignificant. It was observed that SS accumulated in the water spinach root systems which tended to act as a strainer. This process led to plant growth inhibition and finally die-off. The average water spinach growth rates varied from 37 to 107 g wet wt./(m2.d) and no relationship was established between the growth rates and the HRT.

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