Polyacrylamide Wastewater Treatment in a Nested Biofilm Airlift Suspension Reactor

2013 ◽  
Vol 864-867 ◽  
pp. 1608-1611
Author(s):  
Zhong Chen Yu ◽  
Dong Ma ◽  
Song Wang ◽  
Xue Jiao Zhang
Keyword(s):  
Wastewater Treatment ◽  
Oil Recovery ◽  
Large Scale ◽  
Produced Water ◽  
Removal Rate ◽  
Nitrate Removal ◽  
Ammonia Nitrogen ◽  
Walnut Shell ◽  
Biofilm Thickness ◽  
Tertiary Oil Recovery

Polyacrylamide has been widely used in tertiary oil recovery. Oilfield produced water in a large scale contain polyacrylamide, leading to oilfield environment pollution. In this paper, the nested loops biofilm airlift suspension reactor was used in polyacrylamide wastewater treatment. In the reactor, wastewater can alternately flow through the hypoxic environment fixed light carriers and aerobic environment suspended walnut shell biological carriers, achieving simultaneous removal of organic matter and nitrogen. The influencing factors on the organic compound degradation and denitrification performance were studied. Biological and hydrodynamic model of nitrogen and carbon removal was established. Also, the biological phase structure of the carrier biofilm was observed. The results show that polyacrylamide degradation and ammonia nitrogen removal rate are around 30% and 95%, respectively when the experimental hydraulic retention time is 24h. Due to poor denitrification efficiency; nitrate removal rate is only 20%. The carrier biofilm thickness is appropriate, and filamentous bacteria occupy the dominant position.

scholarly journals Enhanced Wastewater Treatment by Immobilized Enzymes

2021 ◽  
Author(s):  
Jakub Zdarta ◽  
Katarzyna Jankowska ◽  
Karolina Bachosz ◽  
Oliwia Degórska ◽  
Karolina Kaźmierczak ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Process Optimization ◽  
Organic Pollutants ◽  
Large Scale ◽  
Removal Rate ◽  
Immobilized Enzymes ◽  
Future Research ◽  
Process Conditions ◽  
Removal Rates ◽  
Catalytic Cycles

Abstract Purpose of Review In the presented review, we have summarized recent achievements on the use of immobilized oxidoreductases for biodegradation of hazardous organic pollutants including mainly dyes, pharmaceuticals, phenols, and bisphenols. In order to facilitate process optimization and achievement of high removal rates, effect of various process conditions on biodegradation has been highlighted and discussed. Recent Findings Current reports clearly show that immobilized oxidoreductases are capable of efficient conversion of organic pollutants, usually reaching over 90% of removal rate. Further, immobilized enzymes showed great recyclability potential, allowing their reuse in numerous of catalytic cycles. Summary Collected data clearly indicates immobilized oxidoreductases as an efficient biocatalytic tools for removal of hazardous phenolic compounds, making them a promising option for future water purification. Data shows, however, that both immobilization and biodegradation conditions affect conversion efficiency; therefore, process optimization is required to achieve high removal rates. Nevertheless, we have demonstrated future trends and highlighted several issues that have to be solved in the near-future research, to facilitate large-scale application of the immobilized oxidoreductases in wastewater treatment.

The Mechanism of Nitrogen Removal in Domestic Sewage of High Ammonia Nitrogen by Three-Step Series Constructed Rapid Infiltration System

2011 ◽  
Vol 356-360 ◽  
pp. 1248-1252
Author(s):  
Ai Bin Kang ◽  
Ying Qiang Yao ◽  
Yu Long Dong
Keyword(s):  
Wastewater Treatment ◽  
Total Nitrogen ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Domestic Sewage ◽  
Municipal Wastewater Treatment ◽  
High Ammonia ◽  
Nitrite Oxidizing Bacteria

The removal and mechanism of ammonia nitrogen and total nitrogen were studie through three-step series of constructed rapid infiltration system by using high ammonia nitrogen domestic sewage of students' living area in a university. The result shows that the removal rate of ammonia nitrogen is 94.47% by using this system, which is 3% higher than conventional rapid infiltration system.The effluent can meet the standard Ⅰ—A of “Discharge standard of pollutants for municipal wastewater treatment plant(GB 18918-2002)”. The amount of ammonium oxidizing bacteria, nitrate oxidizing bacteria, nitrite oxidizing bacteria in this system is higher than that in conventional rapid infiltration system. The correlation between the removal of ammonia nitrogen and ammonium oxidizing bacteria, nitrate oxidizing bacteria, nitrite oxidizing bacteria is significant. The removal rate of total nitrogen is 47.38% by using this system, which is 20.72% higher than that in conventional rapid infiltration system. However, the effluent still can not meet the standard Ⅰ—A of “Discharge standard of pollutants for municipal wastewater treatment plant (GB 18918-2002)”. The amount of denitrifying bacteria in the three-step subsystem increased significantly, which improves the removal of total nitrogen. The correlation between the removal of TN and denitrification bacteria is significant.

scholarly journals Application of composite degradable modified starch-based flocculant on dewatering and recycling properties

2020 ◽  
Vol 82 (10) ◽  
pp. 2051-2061
Author(s):  
Jianbo Liu ◽  
Shouhao Jia ◽  
Liming Xu ◽  
Feifei Zhu ◽  
Shan Ren ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Fermentation Process ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Modified Starch ◽  
Chemical Oxygen Demand Removal ◽  
Sludge Dewatering ◽  
Capillary Suction ◽  
And Storage

Abstract Sludge dewatering is an important step for wastewater treatment. Composite degradable flocculant (CDF) was prepared by cationic polyacrylamide (PAM) grafting onto modified starch with a novel initiator, and characterized by Fourier transform infrared spectroscopy. The microstructure of flocculated sludge was characterized by scanning electron microscopy. The study investigated the properties of CDF compared to PAM, which showed that the prepared CDF exhibited a highly effective flocculation on sludge dewatering, a higher transmittance and chemical oxygen demand removal rate, and a lower value of effluent ammonia nitrogen and total phosphorus. The fermentation process was also analyzed by testing the performance of dewatered sludge (temperature, pH, ammonia nitrogen, E4/E6 (humic acid absorbance at 465 nm (E4) and 665 nm (E6))). The dehydrated sludge with CDF could be easily compressed into cakes by belt-filter for easy transportation and storage. With the continuous addition of CDF and PAM, the corresponding index of capillary suction time (CST) increased. Moreover, the total value of CST with CDF was low, showing a good dewaterability. In addition, the sludge index of pumping time and moisture content with CDF were low in contrast with PAM. Fermentation experiments demonstrated that sludge with CDF had a comparatively high temperature and low value of E4/E6. Such novel CDF shows enormous potential in wastewater treatment and sludge fermentation.

The Study of Axial Dynamic Backwashing Dual-Media Filter Experiment

2013 ◽  
Vol 781-784 ◽  
pp. 2067-2070
Author(s):  
Zhong Chen Yu ◽  
Xue Jiao Zhang ◽  
Song Wang ◽  
Bing Sun ◽  
Xian Jun Zhou
Keyword(s):  
Water Quality ◽  
Oil Content ◽  
Produced Water ◽  
Removal Rate ◽  
Oil Field ◽  
Walnut Shell ◽  
Polymeric Compound ◽  
Filter Materials ◽  
Suspended Substance ◽  
High Removal Rate

According to the problem of polymeric compound appearing in oil field produced water, following by the changes of water quality characteristics that result in the polymeric compound accumulated in the filter tank which lead to the poor regeneration, being partly hardened and the losing, and the over standard of water quality, the study uses the technology of axial dynamic backwashing to back wash and regenerate the dual-media filter of walnut shell/quartz sand. The removal rate of oil content for filter materials reaches above 90% after backwashing. Simultaneously, cleaning the granular filter materials in filter bed achieves high removal rate of oil and suspended substance content, the average removal rate of oil content being 96.0% while the suspended substance 77.81% which greatly improved the water quality index.

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.

The Temperature Influence on the Sauce Wastewater Treatment

2011 ◽  
Vol 183-185 ◽  
pp. 1114-1117
Author(s):  
Jin Long Zuo ◽  
Zhi Wei Zhao
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Treatment Effect ◽  
Removal Rate ◽  
Water Environment ◽  
Ammonia Nitrogen ◽  
Temperature Influence ◽  
Aeration Time

Nowadays the sauce wastewater is doing greater harm to the water environment in China. In order to tackle this problem, the temperature influence on the sauce wastewater treatment effect was investigated. The results showed that when the temperature is 22～32°C the ammonia nitrogen removal effect was good and the ammonia nitrogen removal rate could reach more than 90%. The temperature had no obvious influence on nitrate for sauce wastewater. When the temperature is 22～32°C, the effluent orthophosphate concentration could reach about 1mg/L and the removal efficiency could reach about 70% with aeration time 2.5 h. Thus the sauce wastewater removal effect could be influenced by the temperature.

Integrated constructed wetland systems: design, operation, and performance of low-cost decentralized wastewater treatment systems

2007 ◽  
Vol 55 (7) ◽  
pp. 155-161 ◽  
Author(s):  
L.L. Behrends ◽  
E. Bailey ◽  
P. Jansen ◽  
L. Houke ◽  
S. Smith
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Low Cost ◽  
Nitrate Removal ◽  
Systems Design ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Surface Flow ◽  
Treatment Technology ◽  
Decentralized Market

Several different types of constructed wetland systems are being used as decentralized treatment systems including surface-flow, subsurface-flow, vertical-flow, and hybrid systems. Archetypical wetland systems have design strengths and weaknesses, and therefore it should be possible to design combined (integrated) systems to optimize a number of important treatment processes. This study provides comparative efficacy data for two integrated wetland treatment systems (IWTS) designed to enhance treatment of medium strength wastewater generated from a pilot-scale intensive fish farm. Results from the twenty eight months study included consistently high removal of COD (84%+) and ammonia nitrogen (93%) in both systems. Initially, phosphorus removal was also high (>90%) in both systems, but removal efficacy declined significantly over time. Nitrate removal was significantly better in the system that provided sequential aerobic and anoxic environments. Short hydraulic retention times coupled with sustained removal of COD and ammonia indicate that the ReCip components could be a least-cost wastewater treatment technology in the decentralized market sector.

Experimental Study on Modified Fly Ash as a Substrate of Constructed Wetland

2014 ◽  
Vol 675-677 ◽  
pp. 524-529 ◽  
Author(s):  
Meng Fei Guo ◽  
Ping Xian ◽  
Xi Liu ◽  
Long Hui Yang ◽  
Long Hui Zhan ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Fly Ash ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Municipal Wastewater Treatment ◽  
Effluent Concentration ◽  
Standard Level ◽  
Priority Standard

In order to develop a new substrate filler for wetland, Fly ash and soil was mixed and modified in different mass ratio, then, static adsorption and seepage purification experiments were carried out to choose four appropriate modified fillers for wetland model experiment. Experimental results showed that when the mass proportion of fly ash and soil was 3:7, the best treatment effect was achieved. While using this modified wetland for wastewater treatment, the removal rate of total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH4-N) and COD was 57.52%, 97.58%, 93.78% and 89.53% respectively. The effluent concentration of TN could meet the priority standard (level B) of Discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002), while the effluent concentration of TP, NH4-N and COD could meet the priority standard (level A).

Sign in / Sign up

Export Citation Format

Share Document