Treating Effect of Potassium Ferrate to Aquaculture Recirculating Water

2014 ◽  
Vol 1004-1005 ◽  
pp. 1005-1007
Author(s):  
Dong Xia Zhang ◽  
Qi Liu ◽  
Yong Ming Zhang
Keyword(s):  
Removal Rate ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Potassium Ferrate ◽  
Recirculating Aquaculture ◽  
Nitrite Removal ◽  
Total Ammonia ◽  
Treatment Agent ◽  
Aquaculture Development ◽  
Aquaculture Waste

Aquaculture waste water was a major sewage resource, and recirculating aquaculture is an important mode of aquaculture development. Potassium ferrate is a novel sewage treatment agent and the use of potassium ferrate as a aquaculture recirculating water purification agents had a very important significance in the theoretical and practical application. When the amount of potassium ferrate is 8mg / L, the removal rate of the total number of colonies is 98.8%, the removal rate of COD is 92.16%, 98.78%, and sulfide is 98.42%. For the total amount of ammonia and nitrite also has a certain effect, when the amount of potassium ferrate is 12mg / L, the nitrite removal rate was 44.61%, total ammonia nitrogen removal rate was 23.61%.

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.

scholarly journals Optimization of Polyaluminum Chloride-Chitosan Flocculant for Treating Pig Biogas Slurry Using the Box–Behnken Response Surface Method

2019 ◽  
Vol 16 (6) ◽  
pp. 996 ◽  
Author(s):  
Yu Li ◽  
Leigang Li ◽  
Reham Yasser Farouk ◽  
Yuanyuan Wang
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Removal Rate ◽  
Organic Fertilizer ◽  
Ammonia Nitrogen ◽  
Biogas Slurry ◽  
Nitrogen And Phosphorus ◽  
Polyaluminum Chloride ◽  
Surface Method ◽  
Total Ammonia

Flocculation can remove large amounts of nitrogen and phosphorus from wastewater, and the resulting nitrogen- and phosphorus-rich floc can be used to produce organic fertilizer. For biogas slurries containing high levels of nitrogen and phosphorus, ordinary flocculants can no longer meet the flocculation requirements. In this study, to fully utilize the advantages of the two flocculants and achieve efficient removal rates of nitrogen and phosphorus from a biogas slurry, chitosan (CTS) and polyaluminum chloride (PAC) were used as a composite flocculation agent to flocculate pig biogas slurries. The response surface method was used to study the effect of PAC added (PACadded) to the composite flocculant (CF), composite flocculant added (CFadded) to the biogas slurry and the pH on flocculation performance, and optimize these three parameters. In the tests, when the PACadded was 6.79 g·100 mL−1CF, the CFadded was 20.05 mL·L−1 biogas slurry and the pH was 7.50, the flocculation performance was the best, with an absorbance of 0.132 at a wavelength of 420 nm. The total phosphorus (TP) concentration was reduced from 214.10 mg·L−1 to 1.38 mg·L−1 for a removal rate of 99.4%. The total ammonia nitrogen (TAN) concentration was reduced from 1568.25 mg·L−1 to 150.27 mg·L−1 for a removal rate of 90.4%. The results showed that the CF could form larger flocs, and had greater adsorption capacity and more stable flocculation performance than ordinary flocculants. Furthermore, the CF could exhibit better chelation, electrical neutralization and bridge adsorption.

Study on Treatment of Sewage from Channel Discharge with Biological Accelerator-Biofilm Process

2011 ◽  
Vol 183-185 ◽  
pp. 644-648
Author(s):  
Gai Mei Guo ◽  
Hui Fen Qin
Keyword(s):  
Treatment Effect ◽  
Treatment Process ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Promoting Effect ◽  
Research Results ◽  
The Difference ◽  
Biofilm Process

This paper studied treatment of sewage from channel discharge with biological accelerator-biofilm process, and investigated the promoting effect of biological accelerator on biofilm process during the sewage treatment process. Meanwhile, compared the difference between the laboratory developed compounded enzyme and the foreign composite enzyme. The research results indicated that using biofilm process, the composite enzyme-biofilm process and the compounded enzyme-biofilm process for treating sewage, the removal rate of CODcr was separately 70.5%, 78.4% and 74.0% and that of ammonia nitrogen was separately 38.2%, 48.6% and 45.9%, which accounted for that under the strengthening action of biological accelerator, the treatment effect was remarkable for using biofilm process disposing channel disordered discharge sewage. Furthermore, the promoting effect of the compounded enzyme was equivalent to that of the composite enzyme for biofilm process, and the compounded enzyme could come into use instead of the composite enzyme.

scholarly journals Purification Effect of Sequential Constructed Wetland for the Polluted Water in Urban River

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1054 ◽  
Author(s):  
Xueyuan Bai ◽  
Xianfang Zhu ◽  
Haibo Jiang ◽  
Zhongqiang Wang ◽  
Chunguang He ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Ecological Engineering ◽  
Ammonia Nitrogen ◽  
Surface Flow ◽  
Urban River ◽  
Polluted Water ◽  
Urban Rivers

Constructed wetlands can play an active role in improving the water quality of urban rivers. In this study, a sequential series system of the floating-bed constructed wetland (FBCW), horizontal subsurface flow constructed wetland (HSFCW), and surface flow constructed wetland (SFCW) were constructed for the urban river treatment in the cold regions of North China, which gave full play to the combined advantages. In the Yitong River, the designed capacity and the hydraulic loading of the system was 100 m3/d and 0.10 m3/m2d, respectively. The hydraulic retention time was approximately 72 h. The monitoring results, from April to October in 2016, showed the multiple wetland ecosystem could effectively remove chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN), total phosphate (TP), and suspended solids (SS) at average removal rates of 74.79%, 80.90%, 71.12%, 78.44%, and 91.90%, respectively. The removal rate of SS in floating-bed wetland was the largest among all the indicators (80.24%), which could prevent the block of sub-surface flow wetland effectively. The sub-surface flow wetland could remove the NH4-N, TN, and TP effectively, and the contribution rates were 79.20%, 64.64%, and 81.71%, respectively. The surface flow wetland could further purify the TN and the removal rate of TN could reach 23%. The total investment of this ecological engineering was $12,000. The construction cost and the operation cost were $120 and $0.02 per ton of polluted water, which was about 1/3 to 1/5 and 1/6 to 1/3 of the conventional sewage treatment, respectively. The results of this study provide a technical demonstration of the restoration of polluted water in urban rivers in northern China.

Study on Optimization of Operating Parameters for Modified A2/O Process in Changchun Northern Sewage Treatment Plant

2013 ◽  
Vol 409-410 ◽  
pp. 182-186
Author(s):  
Jun Yin ◽  
Jun Xiang Wang ◽  
Jia Ni Li ◽  
Jing Yi Cui
Keyword(s):  
Removal Rate ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
High Energy ◽  
Ammonia Nitrogen ◽  
Optimal Operation ◽  
Stable Operation ◽  
System Effect ◽  
Operation Conditions

Based on the problem which is water quality instability and high energy consumption in the running of modified A2/O system in Changchun northern sewage treatment plant, we established the optimum parameters and optimized the operation conditions to provide technical support for the stable operation of the wastewater treatment plant by analyzing effect of the system in different conditions Test results showed the best dissolved oxygen concentration in the end of the aerobic tank, sludge recycling ratio and inner recycling ratio should be chosen 1.5~2.5mg/L, 80% and 180%. The operation results with optimal operation conditions showed that COD, ammonia nitrogen, SS, TN and TP removal rate were 89.07%, 80.44%, 95.27%, 61.09% and 89.88%. The process system effect is stable and effluent can satisfy the sewage discharged standards.

scholarly journals Retrofitting Sea Cucumber Nursery Tanks to Recirculating Aquaculture Systems for Highly Intensive Litopenaeus vannamei Aquaculture

2021 ◽  
Vol 11 (20) ◽  
pp. 9478
Author(s):  
Yishuai Du ◽  
Jianping Xu ◽  
Li Zhou ◽  
Fudi Chen ◽  
Tianlong Qiu ◽  
...  
Keyword(s):  
Litopenaeus Vannamei ◽  
Sea Cucumber ◽  
Stocking Density ◽  
Ammonia Nitrogen ◽  
Average Weight ◽  
Recirculating Aquaculture ◽  
Nitrite Nitrogen ◽  
Innovative Methodology ◽  
Recirculating Aquaculture Systems ◽  
Total Ammonia

Designing good recirculating aquaculture systems (RASs) is challenging in shrimp aquaculture. In this study, two sets of RASs were constructed using sea cucumber nursery tanks for rearing Litopenaeus vannamei. Recirculating aquaculture was supported by key technologies such as sewage collection and aeration systems adapted to the rectangular tanks and technologies for the removal of sewage, shrimp shells, and dead individuals. Six-hundred and eighty-five thousand juveniles were selected for rearing in the newly constructed RASs, where the average stocking density was 1013 shrimp/m3. During the recirculating aquaculture period of 53 days, the water temperature of the tanks was 24–31 °C, the salinity was 25–32‰, the pH was 6.4–8.2, the DO was ≥ 4.9 mg/L, the concentration of total ammonia nitrogen (TAN) was maintained between 0.17 and 4.9 mg/L, the concentration of nitrite nitrogen (NO2-N) was between 0.12 and 4.7 mg/L, and the total number of Vibrio bacteria remained between 330 and 9700 cfu/mL. At the end of the experiment, the final average weight of individual shrimp was 13.43 g, and the average yield reached 12.92 kg/m3. The great improvement in growth performance marks a breakthrough in RAS technology of shrimp, and it supports the use of an innovative methodology for the retrofitting and utilization of idle sea cucumber nursery tanks.

Studies on the Performance of Biofilm-MBR

2014 ◽  
Vol 1030-1032 ◽  
pp. 396-399
Author(s):  
Wei Hong Jin ◽  
Cai Ling He ◽  
Feng Gao ◽  
Chen Li
Keyword(s):  
Removal Efficiency ◽  
Total Phosphorus ◽  
Membrane Fouling ◽  
Control Method ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Treatment Performance ◽  
Biological Denitrification ◽  
Pollutants Removal

MBR technology for sewage treatment has the advantages of high volumetric load, good treatment performance and so on. But the MBR technology also has the shortage of membrane fouling. So this study selected the control method of fixing combination packing added in the MBR reactor, so as to reduce the membrane pollution, at the same time in the reactor to create the environment of coexistence of anaerobic and aerobic for biological denitrification. Through the research of the pollutants removal efficiency and the membrane pollution, it was founded that this method can remove 85-95% of COD and ammonia nitrogen. Effluent COD concentration generally is about 25mg/L, and the minimum of it is less than 10 mg/L. Effluent ammonia nitrogen is generally less than 10 mg/L. The minimum effluent concentration of ammonia nitrogen was less than 1 mg/L. The removal rate of total phosphorus was between 30-45%.

Removal Effect of Potassium Ferrate to COD in Different Wastewater

2012 ◽  
Vol 550-553 ◽  
pp. 2288-2290 ◽  
Author(s):  
Zong Cheng Miao ◽  
Fang Wang ◽  
Deng Deng ◽  
Lei Wang ◽  
Jian Zhou Yang
Keyword(s):  
Oxidation Process ◽  
Sewage Treatment ◽  
Ferric Hydroxide ◽  
Redox Potentials ◽  
Potassium Ferrate ◽  
Ability To Act ◽  
Treatment Agent ◽  
Research Objects ◽  
Ph Range ◽  
Papermaking Wastewater

In order to research the removal effect of potassium ferrate to COD in the different wasterwater, the papermaking wastewater and the tanning wastewater were used as research objects. This paper was focused on evaluating the effectiveness of potassium ferrate preoxidation on COD removal by coagulation in different wastewater of papermaking and tanning. Potassium ferrate is a strong oxidant in the entire pH range: its redox potentials are 2.20 and 0.72 V in acidic and basic media, respectively ferrate (VI) ions will be reduced to Fe (III) ions or ferric hydroxide during the oxidation process, potassium ferrate has also the ability to act as coagulant. The removal efficiency was 78.21% to the papermaking wastewater and 85.51% to the tanning wastewater, respectively, when the dosage concentration of potassium ferrate was 20 mg/L. Altogether, potassium ferrate is a perfect sewage treatment agent to papermaking wastewater and tanning wastewater.

Nitrification in brackish water recirculating aquaculture system integrated with activated packed bed bioreactor

2010 ◽  
Vol 61 (3) ◽  
pp. 797-805 ◽  
Author(s):  
V. J. Rejish Kumar ◽  
Valsamma Joseph ◽  
Rosamma Philip ◽  
I. S. Bright Singh
Keyword(s):  
Packed Bed ◽  
Ammonia Nitrogen ◽  
Recirculating Aquaculture System ◽  
Removal Rates ◽  
Packed Bed Bioreactor ◽  
Term Operation ◽  
Total Ammonia Nitrogen ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Total Ammonia

Recirculation aquaculture systems (RAS) depend on nitrifying biofilters for the maintenance of water quality, increased biosecurity and environmental sustainability. To satisfy these requirements a packed bed bioreactor (PBBR) activated with indigenous nitrifying bacterial consortia has been developed and commercialized for operation under different salinities for instant nitrification in shrimp and prawn hatchery systems. In the present study the nitrification efficiency of the bioreactor was tested in a laboratory level recirculating aquaculture system for the rearing of Penaeus monodon for a period of two months under higher feeding rates and no water exchange. Rapid setting up of nitrification was observed during the operation, as the volumetric total ammonia nitrogen removal rates (VTR) increased with total ammonia nitrogen (TAN) production in the system. The average Volumetric TAN Removal Rates (VTR) at the feeding rate of 160 g/day from 54–60th days of culture was 0.1533 ± 0.0045 kg TAN/m3/day. The regression between VTR and TAN explained 86% variability in VTR (P < 0.001). The laboratory level RAS demonstrated here showed high performance both in terms of shrimp biomass yield and nitrification and environmental quality maintenance. Fluorescent in-situ Hybridization analysis of the reactor biofilm ensured the presence of autotrophic nitrifier groups such as Nitrosococcus mobilis lineage, Nitrobacter spp and phylum Nitrospira, the constituent members present in the original consortia used for activating the reactors. This showed the stability of the consortia on long term operation.

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