Experiment Study on Microwave Strengthened Fenton Process Oxidation of Organophosphorus Pesticide Wastewater

2012 ◽  
Vol 260-261 ◽  
pp. 792-795
Author(s):  
Ya Feng Li ◽  
Jing Xin Wang ◽  
Yan Zhang
Keyword(s):  
Synergistic Effect ◽  
Microwave Radiation ◽  
Microwave Power ◽  
Removal Rate ◽  
Organophosphorus Pesticide ◽  
Good Effect ◽  
Fenton Process ◽  
Experiment Study ◽  
Cod Removal Rate ◽  
Radiation Time

Microwave strengthened Fenton process oxidation of organophosphorus pesticide wastewater was studied by microwave chemical technology. With the synergistic effect of microwave and Fenton, pesticide wastewater was treated by varying dosage of pH, n[FeSO4•7H2O]/n[H2O2], microwave power and microwave radiation time. Microwave strengthened Fenton process oxidation of organophosphorus pesticide wastewater could achieve good effect and the COD removal rate can be up to 82%.

Treatment of Acidic Wastewater by Microwave Irradiation Fenton’s Reagent

2013 ◽  
Vol 864-867 ◽  
pp. 1680-1683
Author(s):  
Xiao Tong Guan ◽  
Da Wei Yu
Keyword(s):  
Microwave Irradiation ◽  
Microwave Power ◽  
Irradiation Time ◽  
Removal Rate ◽  
Fenton’S Reagent ◽  
Optimal Conditions ◽  
Fenton's Reagent ◽  
Secondary Pollution ◽  
Cod Removal Rate ◽  
Acidic Wastewater

Acidic wastewater was treated by microwave irradiation Fenton’s reagent, the effect factors: initial concentration of wastewater, dosage of H2O2, microwave irradiation time, microwave power and pH on Acidic wastewater were investigated. The optimal conditions of operation are determined as follows: microwave power is 480W, microwave irradiation time is 5min, H2O2 is 2.0mL and FeSO4 is 0.07g, pH=1. Under these conditions, the COD removal rate is 90.15% for 50mL Acidic wastewater（be diluted ten times）.The result of wastewater treated by microwave irradiation Fenton’s reagent is obvious, and without secondary pollution to environment.

Removal of Organic Pollutants from Reverse Osmosis Concentrate by Electro-Fenton Process

2014 ◽  
Vol 955-959 ◽  
pp. 2294-2299 ◽  
Author(s):  
Hui Ling Du ◽  
Bao Yuan Pan ◽  
Jing Li
Keyword(s):  
Organic Pollutants ◽  
Pulse Generator ◽  
Treatment Time ◽  
Removal Rate ◽  
High Voltage Pulse ◽  
Aeration Rate ◽  
Cod Removal ◽  
Fenton Process ◽  
Voltage Pulse Generator ◽  
Cod Removal Rate

The RO concentrate containing non-degradation organic pollutants was treated by electro-Fenton process. The high voltage pulse generator was used as discharge power. The effects of pulsed electric field parameters, aeration rate and pH on COD removal rate was investigated. The results indicate that the COD removal rate is up to 80.71% when pulsed voltage, pulsed frequency, treatment time, aeration rate and pH are 30000 V, 5 Hz, 240 s, 1.0 m3/h and 10, respectively.

The catalytic oxidation of malachite green by the microwave-Fenton processes

2010 ◽  
Vol 62 (6) ◽  
pp. 1304-1311 ◽  
Author(s):  
Huaili Zheng ◽  
Huiqin Zhang ◽  
Xiaonan Sun ◽  
Peng Zhang ◽  
Tiroyaone Tshukudu ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Malachite Green ◽  
Removal Rate ◽  
Operating Conditions ◽  
Dominant Factor ◽  
Optimum Operating ◽  
Fenton Process ◽  
Confirmatory Tests ◽  
Initial Ph ◽  
Cod Removal Rate

Catalytic oxidation of malachite green using the microwave-Fenton process was investigated. 0% of malachite green de-colorization using the microwave process and 23.5% of malachite green de-colorization using the Fenton process were observed within 5 minutes. In contrast 95.4% of malachite green de-colorization using the microwave-Fenton was observed in 5 minutes. During the microwave-Fenton process, the optimum operating conditions for malachite green de-colorization were found to be 3.40 of initial pH, 0.08 mmol/L of Fe2 +  concentration and 12.5 mmol/L of H2O2 concentration. Confirmatory tests were carried out under the optimum conditions and the COD removal rate of 82.0% and the de-colorization rate of 99.0% were observed in 5 minutes. The apparent kinetics equation of −dC/dt = 0.0337 [malachite green]0.9860[Fe2 + ]0.8234[H2O2]0.1663 for malachite green de-colorization was calculated, which implied that malachite green was the dominant factor in determining the removal efficiency of malachite green based on microwave-Fenton process.

Experimental Advancements of Wastewater Disposal in Coal Chemical Industry by Yeasts

2014 ◽  
Vol 1073-1076 ◽  
pp. 941-948
Author(s):  
Li Li Wang ◽  
Qian Yang
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Chemical Industry ◽  
Ph Value ◽  
Removal Rate ◽  
Cod Removal ◽  
Good Effect ◽  
Coking Wastewater ◽  
Torula Yeast ◽  
N Removal ◽  
Cod Removal Rate

The research in this paper focuses on improving the COD removal rate of the coking wastewater and the NH3-N removal rate and thus diversifying measures to dispose microbial floras in wastewater from the coal chemical industry. The means of adding nutrients, acid treatment and coagulation sedimentation react synergistically to dispose the organic contaminants in the coking wastewater. We attempted to combine Saccharomyces cerevisiae, Torula yeast, tropical Candida mycoderma, etc. to exploit the respective advantages to the full and improve the disposal effect. According to the COD sample (27000-30000) and NH3-N (2500-3000) offered by the client company, the COD removal rate ranged from 24.2% to 31.8% in the mixed experiment group of Saccharomyces cerevisiae and Torula yeast, with NH3-N removal rate from 63.5% to 69.6%. Obviously, the NH3-N removal rate produced good effect. Meanwhile, the COD removal rate ranged form 35.3% to 41.8% in the experiment group only adjusting PH value and the NH3-N removal rate ranged from 40.2% to 50.2%. It is obvious that NH3-N removal rate is influenced by the amount of bacterial strain.

Study on Chemical Wastewater Treatment with Many-Point-Water-Inflow Biological Reaction Tank

2012 ◽  
Vol 518-523 ◽  
pp. 2825-2828
Author(s):  
Fang Li ◽  
Dan Hao
Keyword(s):  
Activated Sludge ◽  
Treatment Effect ◽  
Removal Rate ◽  
Trace Element Content ◽  
Water Inflow ◽  
Good Effect ◽  
Aeration Tank ◽  
Active Sludge ◽  
Cod Removal Rate ◽  
Sludge Concentration

The composition of mixed chemical wastewater is more complex and biodegradability of its is bad, biochemical treatment effect should be further improved. Many-point-water-inflow bioreactor used in this experiment, through controlling hydraulic retention time(HRT), concentration of active sludge of the aeration tank, trace element content and so on, gets a better treatment effect. When water temperature is 25°C, HRT is 5h, 10h, 15h, 20h, 25h,COD removal rate is 60.37%, 82.62%, 89.44% , 91.02%,91.07%. According to the iron content of influent, plus 0.5mg/L ferrous sulfate into influent, the removal rate of COD is increased , activated sludge floc of the sedimentation tank is denser and settling. By changing the activated sludge return ratio to change the activated sludge concentration of the bioreactor, experiments shows that the removal rate of organic matter is better with the activated sludge concentration about 4000-5000mg/L. Influent qualities indicate that this biological treatment has good effect on mixed chemical wastewater.

Optimization of Fenton process for decoloration and COD removal in tobacco wastewater and toxicological evaluation of the effluent

2011 ◽  
Vol 63 (11) ◽  
pp. 2471-2477 ◽  
Author(s):  
Meizhen Wang ◽  
Guiqin Yang ◽  
Huajun Feng ◽  
Zhenmei Lv ◽  
Hang Min
Keyword(s):  
High Efficiency ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Fenton Process ◽  
Toxicological Evaluation ◽  
Hydroxyl Free Radical ◽  
Safe Strategy ◽  
Tobacco Wastewater ◽  
Cod Removal Rate

Decoloration and chemical oxygen demand (COD) removal in tobacco wastewater by Fenton process has been optimized under 25 ± 2 °C. The results showed that the optimal range of conditions were pH 4.13–4.66, Fe2+ 0.29–0.34 g/L and H2O2 ≥ 2.73 g/L. Within this range, up to 95% of colour and 90% of COD was removed. In an enlarged system, setting the optimal conditions as pH 4.50, Fe2+ 0.34 g/L and H2O2 4.00 g/L, the colour removal rate was 96.03 ± 2.57%, with COD removal rate of 93.30 ± 2.92%. The residual COD of 73.67 ± 19.70 mg/L in effluent had hit the State's first-class standard for the industrial discharge in China (<100 mg/L COD, GB8978-1996). The ecological safety of Fenton process has also been evaluated. When reaction completed, the content of hydroxyl free radical (·OH) was 3.26 ± 0.44 mg/L. There was no inhibition of Fenton effluent in growth of Escherichia coli, Pseudomonas putida, Pseudomonas sp. HF-1, Acinetobacter sp. TW and Sphingomonas sp. TY. No oxidative stress was induced on strain HF-1 by Fenton effluent. Thus, Fenton process was one of high-efficiency and ecologically safe strategy for tobacco wastewater advanced treatment.

Study on Treatment of Canteen Wastewater Using Rotating Biological Contactor

2010 ◽  
Vol 113-116 ◽  
pp. 1597-1600 ◽  
Author(s):  
Rong Jun Su
Keyword(s):  
Ambient Temperature ◽  
Removal Rate ◽  
Elimination Rate ◽  
Cod Removal ◽  
Good Effect ◽  
Affecting Factors ◽  
Organic Loading ◽  
Rotating Biological Contactor ◽  
Average Value ◽  
Cod Removal Rate

Rotating biological contactor (RBC) has good effect for treating wastewater, while it is rarely reported to be used for treating canteen wastewater in frigid area as in this paper. After having cultivated the biofilm, this article studied the purification effect on disposing of sewage from dinning hall by RBC and its affecting factors such as input organic loading, stages and temperature. The results indicated that even in low ambient temperature, the COD removal rate can achieve an average value of 70% and NH4-N elimination rate is over 80% in average which displayed better effects. Microscopic observations showed that there were plenty of and varies kinds of microorganisms displayed in order in bio-discs.

Study on Optimal Condition of Activated Carbon Prepared by Microwave Heating from Shot Coke

2014 ◽  
Vol 936 ◽  
pp. 1809-1815
Author(s):  
Ying Fei Hou ◽  
Ya Ya Gu ◽  
Qing Ping Mou ◽  
Gang Yao ◽  
Jian Hui Zhang
Keyword(s):  
Activated Carbon ◽  
Optimal Condition ◽  
Microwave Heating ◽  
Surface Area ◽  
Microwave Radiation ◽  
Microwave Power ◽  
Bet Surface Area ◽  
Benzene Adsorption ◽  
Iodine Adsorption ◽  
Radiation Time

The activated carbon was prepared from the Jing Bo shot coke using KOH as the activation agent by microwave heating. The effect of microwave radiation time, the microwave power and the ratio of activation to shot coke on the properties of the activated carbon were investigated in detail. The result showed that the optimized condition of preparation of activated carbon is as followed: the ratio of activation agent to shot coke is 3:1, the microwave power 900 W and the microwave radiation time is 40 min. In this condition, the BET surface area of the activated carbon is 2668 m2/g; the iodine adsorption value 2281 mg/g and the benzene adsorption value 1368 mg/g.

Analysis of organic removal rates in the aerated submerged fixed film process

1998 ◽  
Vol 38 (8-9) ◽  
pp. 213-221 ◽  
Author(s):  
Mohamed F. Hamoda ◽  
Ibrahim A. Al-Ghusain
Keyword(s):  
Pilot Plant ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Removal Rates ◽  
Hydraulic Loading ◽  
Organic Removal ◽  
Wide Range ◽  
Fixed Film ◽  
Cod Removal Rate ◽  
And Performance

Performance data from a pilot-plant employing the four-stage aerated submerged fixed film (ASFF) process treating domestic wastewater were analyzed to examine the organic removal rates. The process has shown high BOD removal efficiencies (> 90%) over a wide range of hydraulic loading rates (0.04 to 0.68 m3/m2·d). It could also cope with high hydraulic and organic loadings with minimal loss in efficiency due to the large amount of immobilized biomass attained. The organic (BOD and COD) removal rate was influenced by the hydraulic loadings applied, but organic removal rates of up to 104 kg BOD/ m2·d were obtained at a hydraulic loading rate of 0.68 m3/m2·d. A Semi-empirical model for the bio-oxidation of organics in the ASFF process has been formulated and rate constants were calculated based on statistical analysis of pilot-plant data. The relationships obtained are very useful for analyzing the design and performance of the ASFF process and a variety of attached growth processes.

scholarly journals Towards Water and Energy Self-Sufficiency: a Closed-Loop, Solar-Driven, Low-Tech Laundry Pilot Facility (LaundReCycle) for the Reuse of Laundry Wastewater

2021 ◽  
Author(s):  
Devi Buehler ◽  
Nadine Antenen ◽  
Matthias Frei ◽  
Christoph Koller ◽  
Diederik P. L. Rousseau ◽  
...  
Keyword(s):  
Water Quality ◽  
Energy Consumption ◽  
Second Life ◽  
Removal Rate ◽  
Treated Wastewater ◽  
Water Losses ◽  
Batch Mode ◽  
Self Sufficiency ◽  
Cod Removal Rate ◽  
Photovoltaic Plant

AbstractIn the scope of this study, a pilot facility for the recycling of laundry effluent was developed and tested. With the aim to enable nearly complete energy and water self-sufficiency, the system is powered by a photovoltaic plant with second-life batteries, treats the wastewater within the unit and constantly reuses the treated wastewater for washing in a closed cycle. The technology for wastewater treatment is based on a low-tech approach consisting of a physical/mechanical pre-treatment and biological treatment in trickling filter columns. The treatment process is operated in batch mode for a capacity of five washing cycles per day. During five weeks of operation water quality, energy consumption and production, water losses and washing performance were monitored. The system recovered 69% of the used water for the washing machine while treating the wastewater to the necessary water quality levels. The average COD removal rate per cycle was 92%. Energy analysis was based on modelled data of the monitored energy consumption. With the current set-up, an internal consumption rate of 80% and self-sufficiency of 30% were modelled. Future developments aim at increasing water and energy self-sufficiency and optimizing the water treatment efficiency.

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