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A ternary composite was prepared from Polyaspartic acid (PASP), polyepoxysuccinic acid (PESA) and aconitic acid-acrylic acid copolymer (AA-AA). The performances of scale inhibiting, dispersion and biodegradability of the ternary composite in different mass ratio were studied. The results showed that when the mass ratio m(PASP):m(PESA):m(AA-AA) was 1:1:2, the scale inhibition on calcium carbonate was...
This paper indicates the immanent conflict between the way of watershed management and prevention of sudden Water Pollution Accidents in our country. For this reason, a new concept "Trans-boundary Sudden Water Pollution Accidents" has been proposed, and on the base of its characteristics, forecasting mechanism has been researched. On the base of PSR model, we choose 9 forecasting indexes...
To enhance the anaerobic digestion of sludge through adding microzyme, the result of orthogonal experimental design shown that the optimum enhancing conditions are reaction temperature 35°C, rice wine yeast adding, dosage 10% (solid content). In this condition, SCOD content of sludge fermenting liquor reach 7214 mg/L, VFAs 2424 mg/L, the removal rate of SS and VSS are 16.46% and 26.87% respectively.
This thesis discusses the characteristics of drought in Zhanjiang, and analyzes its forming causes from the aspects of climatic and man-made. The integrated drought controlling measures, including soil quality improvement, water conservancy engineering construction, plant restoration and water exploitation in the atmosphere, are put forward.
The distribution characteristics of Yangshapao lake, one of the high fluorine lakes in western Jilin Province, is comprehensively studied. The distribution and thickness of ice layer occurring in winter season has great effect on the concentration of fluorine in water body that is distributed unevenly. The distribution characteristics of fluorine in ice layer is also studied. Water quality balance...
The utilization of rainwater is essential to improve ecological environment of sub-district, and is one of main approaches to achieve sustainable water resources.Taking rainwater collection and utilization of Beifang Garden district as an example in Fuxin city of northeast China, water quality analysis and water quantity balance calculations are completed, also the feasibility and necessity of rainwater...
Through comparing the effluent quality under three conditions with different dissolved oxygen concentration in A2/O bioreactor, results showed that the aeration and TN removal rate under condition 3 compared with the condition 1 reduced 52.6% and enhanced roughly 12% respectively. Under the condition 3, the low oxygen condition reduced the sludge nitration performance, but it still could have NH4+...
The biological purification device that combined the aeration-ship technology and biological contact oxidation was applied to the eutrophic river water treatment of Dongfeng channel in Zhengzhou. The removal efficiency of combined packing and elastic packing to chemical oxygen demand, NH3-N, TP in different dissolved oxygen (DO) and hydraulic loading showed that combined packing performance was better...
Every year since 2003, algae bloom has broken out in the branch bay of the Three Gorges Reservoir in Spring. The area affected by the algae bloom is often subject to disturbance which resulting from shipping, storm-runoff event, water conservancy scheduling and wind-wave etc. With its focus on effect of the disturbances on algae growth, this paper took the Xiangxi River Bay as an example. Water was...
Based on the researches of water use efficiency in China and other countries, a water resource utilization efficiency assessment index system is proposed, which includes six kinds such as water use per 10,000 Yuan of GDP, removal variability of agriculture water resources utilization efficiency, per 10,000 Yuan of added industrial output value etc. By the cluster analysis of indicator data, it adopted...
The process and systematical design issues about dispersive domestic sewage were discussed. By using floatation biological bed and combined subsurface infiltration treatment processes together, the dispersive domestic sewage could be converted into regeneration water for using. It has economical and ecological benefit.
The water quality in rainfall, throughfall, stemflow and litterthrough in the Fraxinus mandshurica at Eastern Mountainous Region in Heilongjiang Province had been studied. The indicator included pH, Do, TURB, TDS, COND, ORP, K, Na, Ca, Mg, Cu, Zn, Mn and Fe. The results showed that the chemical properties of rainfall has been changed after it passing through forest canopy. The value of Do and ORP...
The paper sets up a water quality and water quantity synthetically evaluation index system based on analytic hierarchy process, and then combine fuzzy cluster analysis to assessment evaluate the local groundwater environment comprehensively. The results showed that the method solved weight distribution problem better with such advantages as more reasonable and reliable conclusions, and estimated result...
The purpose of this paper is to analyze the industrial water conservation potential of Ningbo. This paper investigates water use condition of 33 key enterprises which come from six high-water-consuming sectors (paper making, textile and dyeing, thermal power, petrochemical sector, food and beverage, iron and steel). Based on water volume balance model, recycling rate, reuse rate, rate of water wastage,...
Washing coal usually brings about 0.2m3/t wastewater (in terms of closed circulation) due to transpiration, which provides an effective space for the recycle of coke-plant wastewater. The effluent from phenol-cyanogen wastewater biochemical disposal station is used as complementary water for washing coal, and Closed-Cycling System in coal preparation plant is introduced to make industrial experiment...
Xianyang city has rich geothermal resource, in order to more effectively use geothermal resource, this paper presents a geothermal heating system form based on heat pump technique, establishes a calculation model of geothermal water resource load intensity, and analyzes the impact of the heat pump heating load ratio on the geothermal water resource load intensity; on the other hand, this paper also...
A kind of technology and process of treating printing and dyeing wastewater with high efficiency and low energy consumption was presented. Based on the analysis of the current methods, this article summed up the more practical way, combining theory with practice, to provide some references for the similar projects.
A centralized wastewater treatment system has always been regarded as a successful approach during the last century. However, the transfer of this highly water-, energy- and cost-consuming system, and "end-of-pipe" technology to developing countries like China has been proved to be extremely limited and not always feasible. Decentralized water management based on ecological sanitation (EcoSan)...
The present study was aimed to explore the dependences of soil water content distributions on the different sizes of belt spaces in the caragana-grass compound system in Siziwangqi county, Inner Mongolia. The soil water contents were measured at selected typical sample plots within the 5m, 10m and 16 m belt-space caragana -grass compound systems. The soil water contents in the 5m belt-space system...
Xinfeng, is the typical region of the vegetation restoration of serious soil and water loss zone in Jiangxi Province, in which dynamics of species diversity and achievement of 6 restoration communities were analyzed using three diversity indices, Detrended correspondence analysis (DCA) and Detrended canonical correspondence analysis (DCCA). Investigations were carried out in 2004yr and 2008yr. The...
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