Papers by Keyword: Treatment

Abstract: With the social development, environmental pollution problems are emerging, especially oily wastewater discharges, it has been seriously polluted our water, therefore, the oily wastewater treatment technology research become a research hotspot. This paper briefly describes the characteristics of oily waste water, water purification technology and flotation theory, and flotation technology in the oily wastewater treatment applications were reviewed, Finally, the future prospects for the development flotation method.

Abstract: In order to obtain gas potential and characteristics of ginger skin in biogas fermentation as raw material, and explore effect of different treatments on properties of biogas fermentation with ginger skin. At the temperature of 30°C, biogas fermentations with ginger skin were treated in two ways (natural decay and mixed with pig manure). Experiments were respectively set five different treatments (direct fermentation, natural decay, adding pig manure after natural decay (TS content of pig manure / TS content of ginger skin were respectively 1:1, 2:1 and 3:1)). The results showed gas potential of ginger skin and total gas production were respectively 118.08ml/gTS and 320ml, after the 11^th day, the fermentation was in a serious acidification, as a result of stopping gas production. The fermentations with ginger skin which went through natural decay and adding pig manure after natural decay can both eliminate acidification which caused by use of ginger skin directly, and conduce to the fermentation with ginger skin. The fermentation with ginger skin which went through natural decay had higher degradation rate of TS, total gas production, TS gas potential and methane content than fermentation with ginger skin directly.

Abstract: At present, wet lime - gypsum flue gas desulfurization (FGD) technology is very common in the field of gas desulfurization technology. In addition, wet carbide slag - gypsum FGD and Magnesia FGD are also used. In the process of eliminating SO2, with the first two technology, the byproducts of desulfurization wastewater and gypsum will be produced; With Magnesia FGD, the byproducts of magnesium sulfite and magnesium will be produced. The way to utilize desulfurization wastewater, gypsum and magnesium comprehensively and to achieve circular economy is worth exploring.

Abstract: With the improvement of people's living standards in China, rural solid waste emissions increase sharply. In rural areas where most people live, domestic waste mainly deposited in the open air as one of the most important culprit of rural ecological pollution. Domestic waste is piled up randomly in rural area of China, which enter into river and lake and float on the water, and expand the pollution area. According to data research, The composition of rural domestic waste is mainly kitchen waste, waste plastics, waste paper, broken glass, broken pottery, waste fiber, used batteries and other articles for daily use and other things. There are some differences in component between different areas, while kitchen waste still takes a relatively large proportion. Thus organic matters are one of the most important components of domestic waste, which needs to be considered in devising treatment technology. Landfill, compositing and incineration is three basic methods to treat solid waste. Some featured technology such as biomass gasification, worm composting and anaerobic fermentation is developed to treat rural domestic waste considering its specialties. The treatment of rural solid waste of China is faced with many difficulties like environmental consciousness deficiency. Some technology corresponding to the reality of China needs to be developed and popularized . For the rich organic matters in rural domestic waste and specialties of rural economic situation, technologies need to concentrate on recycling biogas and fertilizers..

Abstract: A new hybrid adsorbent of calcium-alginate encapsulated BaSO4-CR (CABSC) has been prepared. The adsorption selectivity and mechanism were studied by investigating the adsorption performance of two anionic and two cationic dyes. The adsorption of two cationic dyes (EV and MB) from aqueous solutions was examined using a batch sorption technique. The effects of time, pH, temperature and ionic strength on the adsorption were examined. Besides, this material was applied in the treatment of two practical cationic dye wastewaters. Our study shows that the sorbent could be a potential candidate for utilization in dye wastewater treatment processes.

Abstract: Due to the presence of complicated and considerable amounts of toxic compounds such as phenolic compounds, thiocyanate and ammonium, coal gasification wastewater (CGW) would cause a serious environmental problem. Conventional treatment of CGW includes a series of biological treatment (mostly anoxic-aerobic process and activated sludge process) after a physico-chemical pretreatment to reduce the concentrations of phenols and ammonium. Although quite effective, these processes are still not enough to meet the strict requirements of the National Discharge Standard of China. To find more efficient way to treat CGW, a serious of hybrid processes were reviewed in this study. Through this review we found that A²O combined with MBR (anaerobic-anoxic-aerobic membrane reactor) can effectively remove COD, total organic carbon, NH₄⁺ -N, total phenols and total nitrogen (TN).

Abstract: In urban drainage filtration systems pass stormwater through a filter media, with the beneficial effects of reducing peak runoff rates and volumes, and retaining pollutants prior to discharge to groundwater or receiving surface waters. The use of filtration systems is advantageous in urban areas limited by space constraints, since such measures do not require high surface area availability. Recent literature has demonstrated that olive stones, which are by-products of olive-oil industry, may be re-used as filtration media for removing targeted stormwater pollutant such as heavy metals, organic matter and hydrocarbons. Although large research literature has investigated the chemical composition of olives and olive stones, only few studies have analyzed the hydraulic behavior of the olive stone. The aim of this article is to show the potential use of the olive stone as filtration system for stormwater, by investigating the hydraulic behavior of such filter media. In this study the hydraulic discharging rate of olive stones is explored for varying widths. This set of results will represent a valuable guideline for engineers in the design of olive stone filtration systems.

Abstract: Papermaking industry generates a considerable amount of wastewater including varieties of pollutants. This paper reviews the ordinary processes of treating papermaking wastewater, and introduces the merits and demerits of these processes. The latest technologies are summed up. A forecast is made through all the methods in recent years. The waste to waste process is particularly promising because of its remarkable economic and environmental benefits.

Abstract: Seasonal performances of three vertical2flowconstructedwetlands (VFCWs) filled with different packing materials for piggery wastewater treatment was investigated. Results showed that there were no some significant seasonal differences in the COD removal efficiency among three types of VFCWs. Biodegradation of organic matter in all three VFCWs were found following the first order rate model. The N removal efficiencies in conventional VFCWs indifferent seasons constantly maintained at 52%. However, N removal efficiencies were found fluctuating over seasons in VFCWs filled with zeolite or zeolite cinder, 89.8% and 93.4% in autumn, 64.2% and 73.5% in winter, and around 80% in spring and summer, respectively. Total nitrogen (TN) removal efficiencies of all VFCWs in winter were considerably lower than those in the other seasons due to relatively weaker processes of nitrification-denitrification. The nitrification activity in VFCWs filled with zeolite2cinder was the highest among all of VFCWs, while the denitrification activity in VFCWs filled with zeolite or zeolite-cinder was more in tensive than that in the conventional VFCWs, agreeing with the TN removal efficiencies in three VFCWs. As packing material, zeolite is able to accelerate the process of denitrification as well as TN removal efficiencies of VFCWs.

Abstract: To explore new ideas for treating sludge in the urban rivers, 4 different sludge treatment schemes were proposed, the construction safety, projection duration, enthusiasm of the public, environmental coordination, resource utilization, supporting of government, benefits, and project cost of the schemes were selected as the main evaluation indexes, and the projection pursuit model was introduced to evaluate the schemes comprehensively. Results showed that: the evaluation and selection of sludge treatment schemes conformed to the calculation requirements of the projection pursuit model; S3 was the optimal sludge treatment scheme with best comprehensive benefits, the projection value of which was recorded as 1.198, much more than that of other treatments. Therefore, it was concluded that using sludge to produce brick (S3) was more appropriate for the sludge treatment in urban rivers, and which depended on the wide market of bricks and had good practical benefits. The study achievements could provide beneficial basis for the river management and the sludge treatment in cities, and also provide the practical basis for the application of statistical models on the selection of project schemes.