Advanced Materials Research Vols. 864-867

Abstract: Enzyme-Linked ImmunoSorbant Assay (ELISA) is a dioxin screening test method, which has several advantages such like low setup cost, low analysis cost, low technical barriers, simple operation, and short analysis time. The case study of this study is a dioxin contaminated site. ELISA was applied in this site due to its widely contaminated range, numerous surveys, and short remediation period. The experience earned in this case study could be the reference for similar pollution site in the future.

Abstract: This paper is based on using coagulation--Fenton oxidation treat the corn starch wastewater, to determine the best conditions of coagulation and oxidation. Experimental results show that at the first coagulation stage, determining polyaluminium chloride (PAC) as the optimal coagulant and optimal dosing quantity of 10ml·L^-1, PAC and coagulant aid polyacrylamide (PAM) dosing quantity proportion is 2:2, pH=7, the temperature of 35 °C, COD_Cr removal effect is best; at Fenton oxidation stage, Fe²⁺/ H₂O₂ is 2:5, COD_Cr removal efficiency; At the second coagulation stage, PAC and PAM dosing quantity is 70 ml·L^-1, COD_Cr removal effectiency. The processing method has good treatment effect, it can reduce the COD_Cr, SS and chroma of wastewater, and eventually recycle the SS as amyloid protein and used for subsequent product production. Meanwhile, the processing method improves the economic benefit and has a high removal rate. The equipment is simple, and just cover a small area, it’s easy to operate, and doesn’t produce secondary pollution, etc.

Abstract: 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.

Abstract: EGSB anaerobic reactor is used to treat the papermaking wastewater, and this paper explore the law of its quick start, HRT and operation cost. Results showed that, during the 47 days, at the condition of inlet COD concentration 2000mg/l, HRT 8h, ascending velocity 0.8m/h, gas output 3600L/d, the COD removal rate can reach up to 65%, and the operation cost is 0.75Yuan/t.

Abstract: Advanced oxidation processes (AOPs) have been developed as an emerging technology for hazardous organic treatment in industrial wastewater. For phenol removing from wastewater traditional disinfection by chlorine is not appropriate because of generating more toxic pollutants - chlorophenols so AOPs are widely used for disinfection of this kind of water. In this paper for phenol degradation is used physico-chemical method (ozonization). Also influence of catalyst is monitored. As catalyst red mud and black nickel mud are used. These catalysts are waste from metal production. Results from analyses are compared.

Abstract: Peanut shell-based activated carbon was prepared by 60% zinc chloride activation. The activation temperature was 923K and activation time was 90min. The activated carbon was applied on the removal of acid light yellow from wastewater. The effects of the amount of adsorbent, the initial dye concentration and pH value of solution were investigated. The results showed that the optimum conditions for dye removal: activated carbon dosage of 2.5g/L, initial dye concentration of 50mg/L, pH value of 3. The color removal efficiency attained above 95%. It is concluded that activated carbon developed from peanut shell could be effective and practical for utilizing in dye wastewater treatment.

Abstract: The paper focused on a self-developed methodology through using sulfur dioxide to deal with high concentration of chromium-containing wastewater. It studied the effects of different pH values, different reaction time, different temperatures and different amounts of sulfur with sulfur dioxide reduction reaction on the chromium-containing wastewater. The results showed that: when the reaction conditions were controlled as follows: the pH values ranged from 2 to 4, the reaction temperature was controlled 40~60°C, the amount of sulfur in theoretical was 1.2 times and the reaction time was 40 min, the hexavalent chromium in the high concentrations of chromium-containing wastewater could be effectively removed.

Abstract: The performance of a dual and multi-stage treatment system which was made up of two-stage whole stillage anaerobic fermentation (WSAF), an internal circulation reactor (IC), an anoxic/aerobic reactor (A/O) and a biological aerated filter (BAF), was investigated for the treatment of complex chemical wastewater with an influent chemical oxygen demand (COD) concentration of 700-55,000 mg/L. According to different wastewater sources and qualities, different types of wastewater were inputted into the treatment system. More than 95% of COD_Cr and suspended substance (SS) could be removed by anaerobic treatment. Approximately 4% of COD_Cr and SS could be removed during the phases of A/O and BAF. The highest values of COD_Cr, BOD₅, NH₃-N and SS in the treated effluent were 87.0, 19.7, 14.5 and 38.0 mg/L, respectively.

Abstract: Dioxin is a typical aromatic compound and also a common component of the wastewater from the manufacture of dye, rubber, drug, plastic, paint, etc. The supercritical water oxidation (SCWO) has been recognized as promising technology for waster treatment, and The organic compounds can be decomposed completely in a few minutes.The experiments are conducted at an initial concentration 0.012 mol/l for Dioxin and an excess multiple 10 for H₂O₂. The effects of the residence time, temperature and pressure on Dioxin destruction rate are examined.

Abstract: Reduced graphene oxide was synthesized by a facile method. Adsorption data indicated that reduced graphene oxide had high adsorption capacity. The adsorption kinetics was modeled by first-and second-order rates, as well as using the Elovich and the Weber and Morris models of intraparticle diffusion. The adsorption process follows second order rate.