Advanced Treatment Of Coking Wastewater Research Articles

Electron Beam Radiation Coupled to the Reverse Osmosis Membrane Process for Advanced Treatment of Coking Wastewater

Electron Beam Radiation Coupled to the Reverse Osmosis Membrane Process for Advanced Treatment of Coking Wastewater

Advanced Treatment of Coking Wastewater by Polyaluminum Silicate Sulfate for Organic Compounds Removal.

Coking wastewater is a typical high-strength organic wastewater, for which it is difficult to meet discharging standards with a single biological treatment. In this study, effective advanced treatment of coking wastewater was achieved by coagulation with freshly prepared polyaluminum silicate sulfate (PASS). The performance advantage was determined through comparison with commercial coagulants including ferric chloride, polyferric sulfate, aluminum sulfate and polyaluminum chloride. Both single-factor and Taguchi experiments were conducted to determine the optimal conditions for coagulation with CODCr and UV254 as indicators. A dosage of 7 mmol/L PASS, flocculation velocity of 75 r/min, flocculation time of 30 min, pH of 7, and temperature of 20 °C could decrease the CODCr concentration from 196.67 mg/L to 59.94 mg/L. Enhanced coagulation could further help to remove the organic compounds, including pre-oxidation with ozonation, adsorption with activated carbon, assistant coagulation with polyacrylamide and secondary coagulation. UV spectrum scanning and gas chromatography-mass spectrometry revealed that the coagulation process effectively removed the majority of organic compounds, especially the high molecular weight alkanes and heterocyclic compounds. Coagulation with PASS provides an effective alternative for the advanced treatment of coking wastewater.

Status and Technology Progress of Advanced Treatment of Coking Wastewater

Status and Technology Progress of Advanced Treatment of Coking Wastewater

Glucose Addition Enhanced the Advanced Treatment of Coking Wastewater

Biological processes have high removal efficiencies and low operational costs, but the secondary effluent of coking wastewater (CWW), even at a low concentration, is difficult for microorganisms to degrade directly. In this study, glucose was used as a carbon source and co-metabolic substrate for microbial acclimation in order to enhance the advanced treatment of coking wastewater (CWW). The removal performance of the pollutants, especially recalcitrant compounds, was studied and the changes in the microbial community structure after activated sludge acclimation were analyzed. The effect of glucose addition on the secondary biochemical effluent of coking wastewater (SBECW) treatment by the acclimated sludge was further studied by a comparison between the performance of two parallel reactors seeded with the acclimated sludge. Our results showed that the concentrations of chemical oxygen demand (COD), total organic carbon (TOC), and UV absorption at 254 nm (UV254) of the wastewater decreased in the acclimation process. Refractory organic matter, such as polycyclic aromatic hydrocarbons and nitrogen-containing heterocyclics, in the SBECW was effectively degraded by the acclimated sludge. High-throughput sequencing revealed that microbes with a strong ability to degrade recalcitrant compounds were enriched after acclimation, such as Thauera (8.91%), Pseudomonas (3.35%), and Blastocatella (10.76%). Seeded with the acclimated sludge, the reactor with the glucose addition showed higher COD removal efficiencies than the control system without glucose addition (p < 0.05). Collectively, glucose addition enhanced the advanced treatment of coking wastewater (CWW).

新型净水剂在焦化废水深度处理中的实际应用

新型净水剂在焦化废水深度处理中的实际应用

Pilot Scale Study on Advanced Treatment of Coking Wastewater with Biological Activated Carbon Technology

This paper reports about a pilot-scale feasibility study of Advanced Treatment of Coking Wastewater with Biological Activated Carbon technology based on the better experimental data of laboratory scale test .The self-designed of the Biological Activated Carbon Aerated tower was based on the optimal operating conditions of the results obtained from laboratory scale test.The removal efficiency to pollutants of efficient compound bacterium is estimated in biological activated carbon process through the variation of COD concentration, chromaticity, and Contrast the total ion chromatogram and UV absorbance spectrum of effluent and inflow.The results of the pilot-scale test show that BAC technology may be a suitable option for the advanced treatment of Coking Wastewater. the efficient degrading strains can reproduce on the activated carbon quickly.Concentrations of COD and chromaticity in outflow water were at a lower level (with COD about 60mg/L and chromaticity about 50 degree), the average COD removal rate greater than 50% and chromaticity removal rate greater than 70%.

Advanced Treatment of Coking Wastewater by Electro-Coagulation

The degradation behavior and mechanism of biologically pretreated coking wastewater (BPCW) were investigated by means of a lab-scale electro-coagulation (EC) in static methods. The results showed that the percent COD and color removal can reach 80.5 % and 95.4 % respectively under the optimal conditions (initial pH of 8.0; reaction time of 30 min; current density of 14.0 mA/cm2 and NaCl dosage 1.6 g/L).

Advanced Treatment of Coking Wastewater by Sequencing Batch MBR-RO

A sequencing batch MBR-RO system has been developed to treat coking wastewater, focusing attention on the COD and TN removal efficiencies. Operational results over 60 days showed that the sequencing batch MBR-RO system had a great impact on removals of COD and TN. the removal efficiencies of COD and TN were 93% and 96% respectively. Final concentrations in the effluent of 0.24 mg phenols/L, 0.02 mg cyanides /L, 28.7 mg COD/L and 4.53 mg TN/L were obtained. In addition, the flux of MBR and RO lost 65.3% and 73.2% respectively.

Study of Modified Coke on the Advanced Treatment of Coking Wastewater

Coke was modified as adsorbent for advanced treatment of coking wastewater and different factors on the impact of wastewater COD removal have been studied. The results showed that pH and temperature effect little on the COD removal and COD of coke wastewater could be reduced from 93mg/L to 48mg/L in the condition of 60 min adsorption time , 300r/min speed revolve and 13g adsorbent dosage. per 200ml water.

Advanced Treatment of Coking Wastewater by Oxidation Process Using Pyrite and Hydrogen Peroxide

Coking wastewater is a kind of recalcitrant wastewater including complicate compositions. Advanced treatment of coking wastewater by Fenton-Like reaction using pyrite as catalyst was investigated in this paper. The results show that the chemical oxygen demand (COD) of coking wastewater decreased significantly by method of coagulation combined with two-stage oxidation reaction. COD of wastewater can decrease from 250mg/l to 45mg/l after treatment, when 2g/L pyrite was used in each stage oxidation and the dosage of hydrogen peroxide (H2O2) is 0.2ml/l for first stage treatment, 0.1ml/l for second stage treatment respectively. The pyrite is effective to promote Fenton-Like reaction with low cost due to high utilization efficiency of H2O2, moreover, catalyst could be easily recovered and reused. The Fenton-Like reaction might be used as a potential alternative to advanced treatment of recalcitrant wastewater.

Experimental Research on the Advanced Treatment of Coking Wastewater by Patented Wastewater Treatment Equipment

In this study, we presented an approach to coking wastewater advanced treatment process with a patented wastewater treatment equipment. The samples were collected from the effluents of the biological treatment tank in a coking wastewater treatment plant. With the experiments of four static single factors and the continuing dynamic process, the discussions about the effects of pH value, influent loading, reaction time, and volume ratio on chromaticity, COD and NH3-N respectively were conducted. The experimental results identified that the optimum process parameters were pH of 3, influent load of 1m3/m2•h, reaction time of 4h and volume ratio of 2:1 respectively. When influents of chromaticity, COD and NH3-N were 210 times, 249.4mg/L, and 31.7mg/L respectively , the effluent of chromaticity, COD and NH3-N were 16 times, 49.7mg/L, and 9.5mg/L respectively, these values could meet the National standard of Recycling and Miscellaneous usages of Municipal Sewage on chromaticity, COD and NH3-N requirements.

Study on Advanced Treatment of Coking Wastewater Using Modified Bentonite

The purpose of this paper is to study the effectively remove organic and inorganic contaminatants in advanced treatment of coking wastewater and try to find a new efficient and inexpensive economical adsorbent project. The organic-inorganic modified Bentonite is used in the experiment as the adsorbent to find out the adsorptive capability under the different conditions of temperature, PH value, adsorptive time, and so on. The results show that Al—CTMAB MB (Aluminum Sulphate & cetyltrimethyl ammonium bromide Modified Bentonite)can reduce the ammonia nitrogen and COD in coking wastewater in the experiment with the dosage of 50g/L, shock for 30 min and PH value is 9 for the best project.

Research on the Advanced Treatment of Coking Wastewater Using Constructed Wetland of Combined Substrate and the Degradation of Organic Matter

The manganese sand-gravel constructed wetland and gravel wetland were used to the advanced treatment of coking wastewater. Results showed that when the HRT was shortened from 5 days to 3 days, COD, iron, manganese in effluent was less than 60mg/L, 0.3mg/L, 0.1mg/L respectively, which meets the standard of “The reuse of urban recycling water ―Water quality standard for industrial uses”. Removal of pollutants was affected by HRT and different combination of substrates. The manganese sand and gravel wetland has better treatment results and the variety and number of organic compound in effluent were greatly reduced. (Abstract)

Advanced Treatment of Coking Wastewater by Coagulation with PAC

An integrated technique was investigated, aiming to provide an effective method for the treatment of biologically treated coking wastewater and to reduce pollutants to concentration values below the limits imposed by the legislation. Coking wastewater containing 270 mg/L COD and 202 times color was treated by coagulation using PAC as well as PAC +PAM, respectively. The application of coagulation using PAC+PAM resulted to a much more efficient removal of color, COD and SS in comparison with single coagulation without PAC. The optimal condition for coagulation with PAC was pH 8, dosage 75 mg/L and dynamic condition 1-minute high speed stirring followed by 15-minute low speed stirring. The optimal condition for coagulation with PAC and PAM was: PAM dosage of 6 mg/L, PAC dosage of 70 mg/L, pH of 8 and reaction time of 20 minutes. Both processes of coagulation were found to be efficient for removal of COD from coking wastewater, but ineffective in reducing color.