Advanced Materials Research Vols. 550-553

Abstract: Abstract. UASB, bio-contact oxidation, coagulation and floating process was adopted in treatment of juice wastewater. Operation results show that when the main pollutants of COD, BOD and SS in the influent were 6033 mg•L^-1, 2512 mg•L^-1 and 2200mg•L^-1, the effluent could reach 63 mg•L^-1, 25 mg•L^-1 and 29 mg•L^-1, respectively, with the removal rate of 99.0 %, 99.0 %, 98.7 %. The effluent reached the I-class criteria specified in Integrated Wastewater Discharge Standard (GB8978-1996) (COD < 60 mg•L^-1, BOD < 20 mg•L^-1, SS < 20 mg•L^-1). The process provides a practical reference for the similar high concentration organic wastewater treatment processing.

Abstract: With the amount of injecting-polymer wells in Xingnan SS block of Daqing Oilfield increasing gradually, a lot of problems, such as the treatment and use of sewage flowed back from injecting-polymer wells, need to be solved. The concentrations of gelling agent, cross-linking agent, and regulators have been optimized by measuring gelling strength and gelling time. The additives about pH modifier and deoxidizer have been selected. As a result, the formula system of profile control using sewage flowed back from injecting-polymer wells has been formed, realizing reuse of sewage, reaching the goal of improving oil recovery. The research in this paper not only solves the problem of re-injecting sewage flowed back from injecting-polymer wells, making full use of resources, but saves costs, improving economic benefits.

Abstract: This study was conducted using the data collected at the Canon River estuary, Taiwan to investigate and analyze Chromium (Cr) contained in the sediments, and to evaluate the enrichment and accumulation of Cr. Results of laboratory analyses show that concentrations of Cr in the sediments are between 27 and 192 mg/kg with an average of 111±52 mg/kg. The spatial distribution of Cr reveals is relatively high in the boundary of the river estuary region. This indicates that upstream industrial and municipal wastewater discharges along the river bank are major sources of pollution. Results from the enrichment factor and geo-accumulation index analyses imply that the sediments collected from the river estuary can be characterized between no enrichment to moderate degree enrichment and between none to medium accumulation of Cr, respectively. Base on the comparison with sediment quality guidelines, the sediments Cr concentrations may cause acute biological damage. The results can provide regulatory valuable information to be referenced for developing future strategies to renovate and manage river estuary and harbor.

Abstract: Graphene for its unique physical structure, excellent mechanical, electrical and physical properties has been widely applied in nanoelectronics, microelectronics, energy storage material, composite materials and so on. In recent years, many researchers found graphene have outstanding adsorption capacity of contaminants in aqueous solution due to its high specific surface area. This paper summarized the graphene, graphene oxide and functionalized graphene removing various heavy metals in waste water.

Abstract: Three surfactant, sodium dodecyl sulfate (SBS), sodium dodecylbenzene sulfonate(SDBS), Polyoxyethylene Sorbitan Monolaurate(Tween 20), Turkey red oil sodium salt(TROS), were prepared and tested as composite adsorbents to remove chlorinated volatile organic component from exhaust gas. A gas–liquid absorption equipment was used to evaluate the performance of composite adsorbents. It is found that the three composite adsorbents could all effectively remove chlorobenzene but their absorption abilities were rather different. The maximum removal efficiency of chlorobenzene is composite absorbent TROS with low surface tension, reached as high as 85%, much greater than those of Tween 20 and SDBS (38% and 65%, respectively).

Abstract: Cr(VI) has a highly toxic effect on the organism and has caused serious harm to the environment. Due to quantum size effects and interface coupling effects, mesoporous materials have novel physical, chemical and many other excellent performances, especially for the promising application in the adsorption of heavy metals. This article includes a survey of removal mesoporous materials for Cr(VI)-contaminated wastewater. It also presents the challenges and prospects in using the mesoporous adsorbents for Cr(VI) removal in wastewater treatment.

Abstract: In the paper, electronic waste plastic and petroleum asphalt were used to synthesize plastic asphalt. The effect of polymer content, shearing rate and time on properties of plastic asphalt has been studied. The results show that softening point and ductility of plastic asphalt can reach optimal values at condition of polymer content 6%, shearing rate 3 kr/min, shearing time 40 min and initiator of potassium persulfate.

Abstract: Waste water containing Congo red in industrial production has caused many serious environmental problems worldwide. In this paper, AB-8 macroporous resin was used to remove Congo red from an aqueous solution by adsorption technique under varying conditions of pH, adsorbent dosage, agitation time, temperature and initial concentration. The results show the adsorption kinetics is well described by pseudo-second-order model. It was found that the equilibrium data was better represented by the Freundlich isotherm model.

Abstract: This paper was based on Carrousel oxidation ditch, which was common in the urban sewage treatment plants. With the effect of SND in the oxidation ditch, it was accomplished the effective removal for nitrogen and phosphorus of urban sewage with low C/N, while adopting point-aeration and brush flow, combining with the operation parameters adjustment. Under the condition of low dissolved oxygen (DO), the phenomenon of simultaneous nitrification and denitrification was obvious in macro and micro environments. And compared with the traditional process, this process increased the proportion of organics up to 51% in the ditch, which raised utilization rate of organics. Based on this to establish the kinetics model of TN removal, it could control the concentration of TN in the effluent effectively by adjusting HRT, MLSS and other parameters in the oxidation ditch, which would provide effective theory basis for optimization and adjustment of the process

Abstract: In this experiment, the copper-containing wastewater was adsorbed by HAP which was prepared by high temperature calcination after high temperature cooking fish scales. By the single factor experiments and orthogonal experiments, the optimal conditions were as follows: the initial concentration of copper ion was 200mg/L,the dosage of HAP was 0.2g,the reaction time was 30min,and pH was 5. The maximum removal efficiency was 98.23%.