Pretreatment of Micro-Polluted Raw Water by Parallel Process of Photocatalysis-Biological Contact Oxidation

2011 ◽  
Vol 374-377 ◽  
pp. 851-854
Author(s):  
Ying Qing Guo ◽  
Chun Sheng Lei ◽  
Er Deng Du
Keyword(s):  
Removal Efficiency ◽  
Ph Value ◽  
Reference Value ◽  
Parallel Process ◽  
Biological Oxidation ◽  
Raw Water ◽  
Practical Engineering ◽  
Contact Oxidation ◽  
Biological Contact Oxidation ◽  
Engineering Projects

By using parallel process of photocatalysis-biological contact oxidation, a research on the pretreatment effect of micro-polluted raw water was conducted. The result indicates that the changes of HRT and the initial concentration take significant impact on the removal of NH3-N. 60min is the best residence time for the pretreatment. Once the thickness of composite media is 120mm, the removal efficiency of CODMn may reach as much as 15.55%, while the average removal efficiency of turbidity is 20%. Since the nitration reaction consumes certain amount of alkalinity, the pH value of outlet water is lower than inlet water. When employing parallel process, biological oxidation and photocatalysis are performed and finished in the same reactor simultaneously, conducing to maintaining a moderate level of the removal of CODMn and NH3-N. All these are of reference value for its application in practical engineering projects.

Application of Process on Furfural Wastewater Treatment

2014 ◽  
Vol 1073-1076 ◽  
pp. 885-888
Author(s):  
Ya Rong Dong ◽  
Li Dong Wang
Keyword(s):  
Wastewater Treatment ◽  
High Efficiency ◽  
Ph Value ◽  
Impact Load ◽  
Stable Operation ◽  
Wastewater Discharge ◽  
High Concentration ◽  
Bacterial Oxidation ◽  
Contact Oxidation ◽  
Biological Contact Oxidation

The furfural wastewater is kind of highly concentrated organic wastewater. According to its quality and quantity characteristics, this process of micro-electrolysis - photosynthetic bacterial oxidation - biological contact oxidation - biological carbon has been used for treating furfural wastewater. Under the condition that, the mass concentration of influent COD, BOD5 and SS were 8337~15692, 2100~4030, 100~300mg/L respectively, the pH value was 2~3, the effluent water after the treatment met the specification for grade 1 in Integrated Wastewater Discharge Standard GB(8978-1996), which practical proved that, the effect of the treatment process had a high efficiency, impact load is strong and stable operation; using it in furfural wastewater treatment, other high concentration wastewater treatment would be application reference.

Novel application of bamboo-based fibers in a biological contact oxidation process

2014 ◽  
Vol 69 (7) ◽  
pp. 1534-1540 ◽  
Author(s):  
Xiaoming Zou ◽  
Yi Feng ◽  
Changming Sheng ◽  
Jia Liu ◽  
Lijun Lu ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Specific Area ◽  
Pollutant Removal ◽  
Bamboo Charcoal ◽  
High Accumulation ◽  
Contact Oxidation ◽  
Biofilm Development ◽  
Biological Contact Oxidation

Generally, biofilm-supporting carriers in biological contact oxidation processes are made from thermoplastic polymers, which cause potential ecological damage because of the low biodegradation and high accumulation in organisms. Thus, four bamboo-based fibers, bamboo primitive fiber, bamboo fiber, bamboo charcoal fiber (BBF) and bamboo charcoal–cotton blending fiber (BCBF), were used as carriers and compared with two commercial carriers (vinylon (VY) and polypropylene (PP)) in a biological contact oxidation process system with the goal to develop a biodegradable and sustainable biofilm medium. Under steady state conditions, pollutants (chemical oxygen demand and NH4+-N) in stage 1 (days 1–29, hydraulic retention time (HRT) = 12 h) were efficiently removed with a removal efficiency ranging from 85 to 95%. In stage 2 (days 30–53, HRT = 4–12 h), the pollutant-removal efficiency of four reactors (BBF, BCBF, VY and PP) were nearly indistinguishable and were higher than the two other reactors, especially when the HRT was set at 4 h (days 46–53). Consequently, two optimized bamboo-based fibers (BBF and BCBF) can be developed as biofilm carriers for wastewater treatment in the future. Furthermore, studies demonstrated that the biofilm development difference showed good correlation with their specific area and relative oxygen content but not with their tenacity and antimicrobial activity.

scholarly journals Study of PFS and PAC coagulation effect on Pi River water

2021 ◽  
Vol 272 ◽  
pp. 01012
Author(s):  
Wan-Fen Wang
Keyword(s):  
Water Sample ◽  
River Water ◽  
Removal Efficiency ◽  
Aluminum Chloride ◽  
Ph Value ◽  
Removal Rate ◽  
Raw Water ◽  
Mass Ratio ◽  
Enhanced Coagulation ◽  
Better Than

Using poly-aluminum chloride (PAC) and poly-ferric sulfate (PFS) as coagulants, the effects of the dosage of PAC and PFS on the removal of turbidity, chromaticity and UV254* in water were investigated by using the method of enhanced coagulation. The results show that when the raw water is neutral and the turbidity is less than 20NTU, and the pH value does not decrease much after coagulation and sedimentation, PAC and PFS are separately added to 7.5mg/l, 35mg/l. The removal rate of turbidity and chromaticity in the water sample can reach 83.75% and 48.47%, respectively, but the removal rate of UV254* is less than 30%, the mass ratio of PAC to PFS is 1:1 to 6:1, the removal efficiency of turbidity and Chroma increased by about 10%, but the removal efficiency of UV254* did not change or even decreased, both PFS and PAC can effectively remove the turbidity and Chroma in the micro polluted Pi River, but the removal effect of UV254* is not good, and the removal effect of PAC is better than PFS.

Study on Aerobic Process Treat Auto Manufacturing Wastewater

2011 ◽  
Vol 356-360 ◽  
pp. 1967-1970
Author(s):  
Xing Guan Ma ◽  
Chen Chen ◽  
Jing Wen ◽  
Tie Shan Ming ◽  
Wei Cui
Keyword(s):  
Dissolved Oxygen ◽  
Removal Efficiency ◽  
Ph Value ◽  
Organic Pollutant ◽  
Dissolved Oxygen Concentration ◽  
Aerobic Process ◽  
Contact Oxidation ◽  
Wastewater Pollutants ◽  
Oxidation System

In dealing with auto manufacturing wastewater, aerobic process was viewed as the follow-up treatment of anaerobic process. Studying on the system of aerobic contact oxidation, all kinds of factors (HRT, influent CODCr concentration, dissolved oxygen (DO), pH value, alkalinity) effect on removal efficiency of the anaerobic effluent CODCr, NH4+–N, NO3–N and turbidity. The results showed that: when the filtration rate is less than 0.0625ml•h-1, in the aerobic contact oxidation system ,the organic pollutant′s removal efficiency is very stable; in system, when dissolved oxygen concentration is greater than 10.00ml•h-1, its removal efficiency keep a higher level; aerobic process could remove 81% of COD of the influent，and the effluent COD could meet the qualityⅡ of Discharge standard of wastewater pollutants for industry(GB8978—1996) .

Application of basalt fibers in a biological contact oxidation reactor for the treatment of landfill leachate

2021 ◽  
Vol 297 ◽  
pp. 126648
Author(s):  
Huicheng Ni ◽  
Muhammad Arslan ◽  
Junchao Qian ◽  
Yaping Wang ◽  
Zhigang Liu ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Basalt Fibers ◽  
Contact Oxidation ◽  
Oxidation Reactor ◽  
Biological Contact Oxidation

Preparation of Sands Modified by Aluminous Salt and its Adsorption Capability of CD2+

2011 ◽  
Vol 130-134 ◽  
pp. 856-859
Author(s):  
Chun Sheng Ding ◽  
Yang Ping Fu ◽  
Qian Fen Zhu ◽  
Jing Fu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Influencing Factors ◽  
Removal Efficiency ◽  
Specific Surface Area ◽  
Quartz Sand ◽  
Ph Value ◽  
Alkaline Condition ◽  
Initial Concentration ◽  
Adsorption Capability

In this experiment quartz sand was chosen as a carrier to be coated by aluminous salt under alkaline condition, and then the specific surface area was tested, and the adsorption capability and Cd2+ removal influencing factors of modified sand were studied. The investigation results showed that the specific surface area of modified sand was 75.244m2/g which was 9.38 times of that of original sand; the removal efficiency of Cd2+ by aluminous salt modified sand reached 59% contrast to 39% of original sand with pH 7.00. It was also found that the removal efficiency of Cd2+ by the aluminous salt modified sand was reduced with the increase of initial concentration of Cd2+ solution, and was enhanced with the increase of pH value, the Cd2+ removal efficiency was almost 71% with pH 9.0.

scholarly journals Removal Efficiency of Solid Particles from Raw Water Using AFM Grade-2 Media: Case Study

2018 ◽  
Vol 09 (03) ◽  
Author(s):  
Sami M Al Aibi ◽  
Jamal S Al Rukabie ◽  
Adel O Sharif ◽  
Dhia Y Aqar ◽  
Hameed B Mahood ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Solid Particles ◽  
Raw Water
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