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.

Reed beds: constructed wetlands for municipal wastewater treatment plant sludge dewatering

2001 ◽  
Vol 44 (11-12) ◽  
pp. 393-398 ◽  
Author(s):  
J.S. Begg ◽  
R.L. Lavigne ◽  
P.L.M. Veneman
Keyword(s):  
Wastewater Treatment ◽  
Total Phosphorus ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Sludge Dewatering ◽  
Sludge Treatment ◽  
Reed Beds ◽  
Reed Bed

Reed beds are an alternative technology wastewater treatment system that mimic the biogeochemical processes inherent in natural wetlands. The purpose of this project was to determine the effectiveness of a reed bed sludge treatment system (RBSTS) in southern New England after a six-year period of operation by examining the concentrations of selected metals in the reed bed sludge biomass and by determining the fate of solids and selected nutrients. Parameters assessed in both the reed bed influent and effluent: total suspended solids, biochemical oxygen demand, nitrate-nitrogen and total phosphorus. In addition, the following metals were studied in the reed bed influent, effluent and Phragmites plant tissue and the sludge core biomass: boron, cadmium, chromium, copper, iron, lead, manganese, molybdenum, nickel, and zinc. The removal efficiencies for sludge dewatering, total suspended solids and biochemical oxygen demand were all over 90%. Nitrate and total phosphorus removal rates were 90% and 80% respectively. Overall metals removal efficient was 87%. Copper was the only metal in the sludge biomass that exceeded the standards set by the Massachusetts Department of Environmental Protection for land disposal of sludge. The highest metal concentrations, for the most part, tended to be in the lower tier of the sludge profile. The exception was boron, which was more concentrated in the middle tier of the sludge profile. The data and results presented in this paper support the notion that reed bed sludge treatment systems and the use of reed beds provide an efficient and cost effective alternative for municipal sludge treatment.

Treatment of Refinery Wastewater with Isolated Biological Aerated Filters: A Pilot-Scale Study

2012 ◽  
Vol 610-613 ◽  
pp. 2332-2341
Author(s):  
Jian Guang Huang ◽  
Li Zhong ◽  
Wen Yu Xie
Keyword(s):  
Waste Water ◽  
Waste Water Treatment ◽  
Oxygen Demand ◽  
Volume Ratio ◽  
Pilot Scale ◽  
Mean Value ◽  
Operating Conditions ◽  
Water Volume ◽  
High Concentration ◽  
Set Up

A pilot scale biochemical treatment system containing three isolated biological aerated filters, one oil-separation pool and one secondary sedimentation tank was set up and used for high concentration organic waste water treatment. Effect of different operating conditions on Chemical Oxygen Demand (CODCr), sulphides, hydroxybenzene and oil degradation was investigated. And the ways of sulphides removal were also explored. While CODCr, the concentrations of sulphides, hydroxybenzene and oil in the waste water are no more than 1500 mg/L, 800 mg/L, 15 mg/L and 150mg/L, respectively, the system can run stably and the total removal of these pollutants is 88.8%, 98.8%, 96.8% and 91.0% accordingly though hydraulic retention time (HRT) varies from 7.95 hr to 15.90 hr and the air/water volume ratio (AWVR) varies from 12 to 8. Most of the sulphides are removed by Biodegradation with Isolated Biological Aerated Filters. Most of the pollutants are removed in the 1st BAF and about 96.5% by mean value of sulphides transforme into elemental sulfur and only about 2.7% by mean value of sulphides transforme into sulphates.

A new oxic-settling-anaerobic (NOSA®) activated sludge process for minimizing excess sludge in secondary biological treatment plants: a pilot-scale evaluation of the absorption–biodegradation process

2013 ◽  
Vol 68 (3) ◽  
pp. 530-536 ◽  
Author(s):  
Ke Wu ◽  
Shi-yu Li ◽  
Feng Jiang ◽  
Jun Wang ◽  
Guang-li Liu ◽  
...  
Keyword(s):  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
Pilot Trial ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Sludge Dewatering ◽  
New Process ◽  
Biodegradation Process

This study compared the sludge reduction performance of a new oxic-settling-anaerobic (NOSA) process with that of a conventional adsorption–biodegradation process. A 50 m3/d pilot trial system with two different process configurations was operated for 6 months. The NOSA process functioned effectively in removing both chemical oxygen demand and nitrogen with the efficiencies of 86 and 92.5%, respectively, which reduced approximately 40% of the excess sludge. In this research, 0.77 kg volatile suspended solids/d sludge vanished in the anaerobic tank, which accounted for 58.9% of the total sludge loss in the NOSA process. Economic calculation suggests that the new process can dramatically upgrade the sludge reduction in wastewater treatment plants without a digestion device, and the investment for fundamental upgrading can be recovered in 5–6 years by cutting the costs of excess sludge dewatering and disposal treatment.

scholarly journals Possible applications of ferrate(VI) in the treatment of industrial wastewater effluent in the laboratory

2015 ◽  
Vol 69 (1) ◽  
pp. 43-50
Author(s):  
Ljiljana Nikolic-Bujanovic ◽  
Milan Cekerevac ◽  
Milena Tomic ◽  
Mladen Zdravkovic
Keyword(s):  
Industrial Wastewater ◽  
High Efficiency ◽  
Oxygen Demand ◽  
Wastewater Effluent ◽  
High Concentration ◽  
Industrial Plants ◽  
Physical Chemical ◽  
Developed Surface ◽  
High Sorption ◽  
High Chemical Oxygen Demand

This paper shows the effects of ferrate(VI) application in the treatment of industrial wastewater effluent in laboratory conditions. Samples used are a mixture of wastewater effluent from various industrial plants whose composition was determined by analyzing samples before the ferrate(VI) treatment. Determining physical-chemical characteristics of the samples showed very high chemical oxygen demand (COD) and the concentrations of individual pollutants are higher than the maximum allowed. In the tested samples, the COD was from 18 (sample 1) to 580 times (sample 2) greater than allowed (allowed 45 - 150 mg/l), while the concentrations of certain metals were several times higher than allowed (Cu allowed 0,1 mg/l, Zn allowed 0,2 mg/l). Also, a high concentration of total phosphorus content (allowed 2 mg/l) and fluoride was found (allowed 20 mg/l), 2-3 times higher than permissible. The applied Na2FeO4 was synthesized by electrochemical method and applied in situ. Physical-chemical testing of samples, after treatment with different amounts (2, 5, 8, and 10 ml) of Na2FeO4, concentration of 8 g/l showed that ferrate(VI) can be used as a multifunctional agent in the purification of industrial wastewater, where in the amount of contaminating matter is reduced below the maximum permitted level. It was demonstrated the high efficiency of ferrate(VI) as a strong oxidant in the removal of total P and suspended materials. Also pointed out was the high sorption power of the generated ferric(III)hydroxide, which with its developed surface absorbs 95,5% of the F- and removes it from the solution in the form of sludge. Showed a high efficiency of ferrate(VI) in the total removal of P (70 to 99,5%), and F- (89 to 95,5%), but depending on the presence of the total COD value or the presence of the total organic substances. At high values of the COD major part of ferrate(VI) is consumed in the oxidation of organic material and the formation of Fe(OH)3, which accelerate the process of decomposition of ferrate(VI), which contributes to lower the efficiency of the removal of P and F-.

scholarly journals Domestic Wastewater Treatment: A Comparison between an Integrated Hybrid UASB-IFAS System and a Conventional UASB-AS System

2021 ◽  
Vol 13 (4) ◽  
pp. 1853
Author(s):  
Ayman M. Dohdoh ◽  
Ibrahim Hendy ◽  
Martina Zelenakova ◽  
Ahmed Abdo
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
High Efficiency ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Climatic Conditions ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge

The current study presents a detailed evaluation and comparison between two integrated anaerobic–aerobic systems for biological wastewater treatment under equal conditions in all aspects (wastewater characteristics, climatic conditions, reactor sizing, and even the measurement methods). The two examined systems are (i) a hybrid upflow anaerobic sludge blanket (hybrid UASB) coupled with integrated fixed-film activated sludge (IFAS) and (ii) a conventional UASB coupled with activated sludge (AS). The present comparative study aims to evaluate and assess the effect of adding carrier-filling media on the performance of the classical integrated UASB-AS. The two parallel pilot-scale systems, hybrid UASB-IFAS and UASB-AS, were installed and operated at a wastewater treatment plant. Three sets of experiments were conducted to examine the influence of the hydraulic retention time (HRT) on the consequent organic and hydraulic loads, temperature, and recirculation rate of the proposed systems. The main results showed that the two investigated systems had a comparably high efficiency for the removal of organic matters and ammonia. Moreover, a paired sample t-test indicated there was a statistically significant effect of the filling media, and the performance of the hybrid UASB-IFAS increased significantly compared with that of the UASB-AS system. An additional benefit of the filling media on the hybrid system was its high stability when changing the organic and hydraulic loads. The optimum HRT was 6 h, with a total chemical oxygen demand (TCOD) percentage removal of approximately 95% in both examined systems. Treatment of sewage under high and low temperatures indicated that increasing the temperature improved the efficiency of the overall process for both systems significantly.

Biological Aerated Filter Applied to Advanced Treatment of Ammonia Nitrogen in Wastewater from Hair Products

2013 ◽  
Vol 361-363 ◽  
pp. 644-649
Author(s):  
Guo Min Tang ◽  
Peng Cao ◽  
Shuang Wang ◽  
Yun Chen
Keyword(s):  
Oxygen Demand ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Technology Support ◽  
Biological Aerated Filter ◽  
Low Carbon ◽  
High Concentration ◽  
Standard Requirement ◽  
Aerated Filter ◽  
The Moment

Wastewater from hair products was the industrial wastewater typically hard to treat with high concentration ammonia nitrogen (NH4+-N) and the low Carbon to Nitrogen (C/N) ratio. In this study ,a pilot-scale study was conducted on Biological Aerated Filter ( BAF) to deeply remove NH4+-N in wastewater from hair products, which aimed to provide technology support for hair products enterprises.The experiments showed that the optimal conditions of BAF was as following: the ratio of air to water was 19:1, the ammonia nitrogen volumetric load was 0.22 kgm3d-1, in this situation the removal efficiency of Chemical Oxygen Demand (CODcr) and NH4+-N were respectively from 25.0% to 32.5% and from 90.6% to 92.5%, the NH4+-N concentrations and CODcr in effluent were always under 12 mg/L and 100 mg/L respectively, which meet fully first class discharge standard requirement of Integrated wastewater discharge standard in china (GB8978-1996)(IWDSC). Moreover the experiment demonstrated that BAF returned to normal at the moment of 2.5 hours after the end of backwashing.

Biological treatment of high-pH and high-concentration black liquor of cotton pulp by an immediate aerobic-anaerobic-aerobic process

2009 ◽  
Vol 60 (12) ◽  
pp. 3275-3284 ◽  
Author(s):  
Miao Lihong ◽  
Li Furong ◽  
Wen Jinli
Keyword(s):  
Removal Rate ◽  
Black Liquor ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Laboratory Scale ◽  
The Novel ◽  
High Concentration ◽  
Treatment Unit ◽  
Alkaliphilic Bacteria ◽  
Aerobic Process

In this study, an immediate aerobic-anaerobic-aerobic (O/A/O) biological process was established for the treatment of black liquor of cotton pulp and was tested by both laboratory-scale batch experiment and pilot-scale continuous experiment. The effects of the hydraulic retention time (HRT) were studied, as were the alkaliphilic bacteria number, the culturing temperature and the concentration of black liquor on COD (chemical oxygen demand) removal. The total COD (CODtot) removal rate of the novel O/A/O process, for a black liquor with influent CODtot over 8,000 mg/L and pH above 12.8, was 68.7 ± 4% which is similar with that of the traditional acidic-anaerobic-aerobic process (64.9 ± 3%). The first aerobic stage based on alkaliphilic bacteria was the crucial part of the process, which was responsible for decreasing the influent pH from above 12 to an acceptable level for the following treatment unit. The average generation time of the alkaliphilic bacteria in the black liquor was about 36 minutes at 40°C in a batch aerobic activated sludge system. The efficiency of the first aerobic stage was affected greatly by the temperature. The CODtot removal at 55°C was much lower in comparison with the CODtot removal at 45°C or 50°C. Both the laboratory-scale batch experiments and the pilot-scale continuous experiment showed that the CODtot removal rate could reach about 65% for original black liquor with a pH of about 13.0 and a COD of 18,000–22,000 mg/L by the immediate O/A/O process. The first aerobic stage gave an average CODtot removal of 45.5% at 35°C (HRT = 72 h) at a volume loading rate of 3.4 kg COD m−3 d−1.

Surplus activated sludge dewatering in pilot-scale sludge drying reed beds

2009 ◽  
Vol 172 (2-3) ◽  
pp. 1122-1130 ◽  
Author(s):  
A.I. Stefanakis ◽  
C.S. Akratos ◽  
P. Melidis ◽  
V.A. Tsihrintzis
Keyword(s):  
Activated Sludge ◽  
Pilot Scale ◽  
Sludge Dewatering ◽  
Reed Beds ◽  
Sludge Drying

Application of Amorphous Nanoparticle Fe-B Magnetic Fluid in Wastewater Treatment

NANO ◽  
2019 ◽  
Vol 14 (09) ◽  
pp. 1950119 ◽  
Author(s):  
Chuncheng Yang ◽  
Mengchun Yu ◽  
Xiuling Cao ◽  
Xiufang Bian
Keyword(s):  
Wastewater Treatment ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
High Efficiency ◽  
Removal Rate ◽  
Average Particle Size ◽  
Oxygen Demand ◽  
Amorphous Structure ◽  
Average Particle ◽  
High Concentration

Amorphous magnetic particles demonstrate excellent comprehensive properties and outstanding characteristics for numerous applications. In this report, magnetic crystalline Fe3O4 and amorphous Fe-B nanoparticles were successfully synthesized and introduced to prepare water-based magnetic fluids. The Fe3O4 and Fe-B particles are homogeneous nanoparticles with an average particle size of [Formula: see text][Formula: see text]nm. The shape of Fe-B amorphous nanoparticles is regular. The saturation magnetizations of Fe-B and Fe3O4 particles are 74 emu/g and 69 emu/g. The use of crystalline Fe3O4 magnetic fluid and amorphous Fe-B magnetic fluid in advanced treatment of high concentration organic wastewater was presented. The removal rate of chemical oxygen demand by using the amorphous Fe-B magnetic fluid reached 96%, about 16% higher than that by using the Fe3O4 magnetic fluid. Moreover, compared with Fe3O4 magnetic fluid, the treatment results demonstrate that the decolorizing effect by using the amorphous Fe-B magnetic fluid was 20% higher. It has been found that the nano-size Fe-B particles in magnetic fluid with amorphous structure led to high efficiency of wastewater treatment due to the catalytic activity.

Enhancing the efficiency of wastewater treatment by addition of Fe-based amorphous alloy powders with H2O2 in ferrofluid

2014 ◽  
Vol 07 (03) ◽  
pp. 1450028 ◽  
Author(s):  
Chun-Cheng Yang ◽  
Xiu-Fang Bian ◽  
Jian-Fei Yang
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Amorphous Alloy ◽  
High Efficiency ◽  
Removal Rate ◽  
Waste Water Treatment ◽  
Oxygen Demand ◽  
Advanced Treatment ◽  
High Concentration ◽  
Amorphous Structures

Using combination of ferrofluid (FF) and Fe -based amorphous alloy in the advanced treatment of high concentration, organic wastewater was investigated. The addition of Fe 73.5 Nb 3 Cu 1 Si 13.5 B 9 amorphous alloy powders into a FF give rise to a dramatic enhancement in decreasing chemical oxygen demand (COD) and decolorization. The removal rate of COD by using FF that combined Fe 73.5 Nb 3 Cu 1 Si 13.5 B 9 metallic glass (MG) particles reached 92% in the presence of H 2 O 2, nearly more than 50% higher than that by using only FF. Furthermore, compared with the FF, the decolorizing effect of the combination was 20% higher. It has been found that MG powders with the amorphous structures have high efficiency of waste water treatment and lead to high catalytic ability.

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