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Water quality monitoring requires characterization of a range of organic and inorganic components present within the sample. We present here initial findings in the design of a novel system to detect contaminants by characterizing their characteristic fluorescence fingerprints in a 3-dimensional excitation emission matrix. This is a proof of principle for a system that would then use principal component...
The avermectin wastewater was treated with SBR technique. This paper was focused mainly on the removal rate of COD and change of ammonia nitrogen of influent and effluent. At the stable phase of SBR reactor operation, the removal rate of COD could be about 75% when the influent volume load was 1.01 kg/(m3 d), and the effluent COD was below 300 mg/L. Temperature had a great impact on the effect of...
In this paper, water environment influence is simulated effectively from Beilun fifth stage engineering construction based on precise flow field of Beilun harbor. owing to piled wharf structure, engineering construction on non-pollution ecology hydrodynamic environment influence is small, only engineering local has certain influence; During the influence of suspended solids is primary, and affect...
The paper reviews the research progress in sludge dewaterability by thermal conditioning and analyzes the fundamental mechanisms of sludge dewaterability. The main factors affecting sludge dewaterability by thermal conditioning are experimentally investigated. The results show that the major factors for improving sludge dewaterability by thermal conditioning are conditioning temperature and residence...
The alkaline wastewater from oil refinery is a high concentration alkaline wastewater, which contains a great deal of sulfide, phenol and oil pollutants. A novel two stage circulating biological aerated filter (CBAF) was used to treat the alkaline wastewater after its neutralization. The factors of various air/water volumetric ratio, hydraulic retention time (HRT), which affected the removal of COD,...
In this work, the advanced treatment of the biologically treated wastewater of a textile plant using combination of ozonation and two-stage biological aerated filter (BAF) was studied. Comparing different ozone dosing methods, it was found that the integrated device including ozonation and BAF, allowed a higher COD (chemical oxygen demand) and color reduction. Comparing different treatment processes,...
In this work, chemical oxygen demand (COD) removal and decolorization of polyester scouring effluent by coagulation-acidation have been studied experimentally. Acidulated bentonite was used as coagulant. The effects of bentonite dosage, PAM dosage, stirring time, and pH after acidation on the efficiency of COD and color reduction were studied by orthogonal methodology. Finally the optimum conditions...
Mangroves are a diverse group of unrelated trees, palms, shrubs, vines and ferns that share a common ability to live in waterlogged saline soils subjected to regular flooding Mangroves are functioning as buffer between sea water and ground water. They are highly specialized plants that have developed unusual adaptations to the unique environmental conditions in which they are found. The wastewater...
The objective of present study was to evaluate the removal efficiency of high strength organic wastewater using experiment scale of constructed wetlands by comparing the free water surface flow (FWS) and subsurface flow (SF) systems. The emergent plant employed was Cyperus sp. The average removal efficiencies for both systems were 57.8-61.4%, 79.9-86.8%, 88.6-92.0%, 46.9-58.1%, and 79.9-91.2% for...
The objective research of this paper is constructed wetlands. By examining the COD, TP degradation factors to analyze the characteristics of constructed wetlands. This article discusses the impact on COD of pH, ORP, ALR, hydraulic loading and the TP of HRT, planting. The results show that the clean dirt capacity of constructed wetlands is a complex biodegradation adsorption process. A variety of factors...
This paper focuses on piecewise linear growth model of water quality about the river. The experiment was performed on South Sewage Discharge River of a certain Coastal City, in China. Physical, chemical parameters such as water temperature (T), turbidity (Tur) were measured over a one-year period including dry period, level period (May), wet period, level period (Oct.). Based on multilevel models,...
High economic growth in Shandong has had huge implications for great water consumption and produced significant water pollutants. Saving index is introduced to analyze the evolution of the performance of water consumption, waste water discharges, COD (Chemical Oxygen Demand) and ammonia nitrogen emissions in Shandong over the past 12 years. The change of saving indexes represents Shandong's water...
The effect of pollutants removal from first flush by filtration through four filter media was investigated by measuring turbidity, SS, COD, TP and TN. The four filter media were selected from familiar and available materials, including slag, geotextile, nylon net and wiry net. Experiments were conducted in an elaborate channel with raw water obtained by mixing tap water with some sludge to simulate...
A preliminary study using gamma radiation on coking wastewater samples was carried out. Chemical oxygen demand (COD), biochemical oxygen demand (BOD) and Ammonia-nitrogen content results were obtained at different doses (1.0, 3.0, 5.0 and 7.0 kGy). As increase of the absorbed doses, a decrease of COD and BOD was observed after irradiation, whereas at the doses of 5 kGy and 7 kGy, the residual concentrations...
In this paper, pretreating p-tertt-butylphenol formaldehyde resin synthesized wastewater has been carried out by the combined techniques of the ferric-carbon micro-electrolysis (abbreviated as FCME) and the Fenton reaction. The result shows that when the COD of the wastewater is between 3350~8370mg/L, pH=2.0 and the reaction time of FCME is 120 minute, the removal of COD is above 48% though the FCME...
Oxidation ponds are widely used for wastewater treatment in developing countries because of the relative simplicity and low operating costs. Thanks to the permeability of the soil layer at the bottom of ponds, contaminants can go into groundwater from wastewater during its residence period. In this study, about 14 shallow groundwater samples were collected from pumping wells around an oxidation pond...
Caofeidian sea area is an important ecoregion of Hebei province. It's meaningful to investigate the pollution situation of this area. Firstly, a numerical model of tidal flow and pollutant transport based on Delft3D-FLOW is established to simulate and analyze COD distribution in Caofeidian sea area. Then, the model is verified by measured data. Finally, the flow field and COD concentration in this...
Supercritical(sub-critical) water oxidation technology is applied to degrade the explosive wastewater and low its chemical oxygen demand (COD). The technology optimum and reaction dynamics of TNT, RDX, HMX degradation have been investigated. The experiment results show that the optimum degradation technology is: reaction temperature T=648K, reaction time t=5min, the volume proportion of waste water...
Sewage discharge creates a serious environmental pollution in water resources. This is the one of the biggest pollution problem in India. The rapid growths of the population, the technological and industrial boom have brought enormous problems and degradation of the environment. Effective collection and treatment of municipal wastewater is a critical problem in a fast developing country like India...
A new process of enhanced dissolved air floatation (DAF) by pulsed high voltage discharge was studied in this paper. With high voltage discharges, removal rate of some normal water quality indexes were better improved, such as UV254 and CODMn from 0.145 to 0.142 and from 6.2 mg/L to 5.8 mg/L. The turbidity of water after treated with pulsed high voltage discharges was larger than that without discharges...
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