The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An experiment of treating anaerobic fermented hog pen sewage by improved A2/O reactor was carried out to study the pollution mater reducing rate during the course of combine domestication. After anaerobic fermented cultivation course of hog pen sewage by A2/O technics, tHought the treatment system's parameters included deLiquescent oxygen (DO), hydrauLics reside time (HRT) to study the system's treatment...
By taking a sequencing-batch membrane bioreactor (SBMBR) which operated in anaerobic aerobic (AO) as the research object, the effects of influent C/N ratio on pollutant removal performance in this system have been investigated. when the influent C/N ratio was 17.3 ∼ 18.5, the average removal rate of COD, ammonia nitrogen (NH4+-N, total nitrogen(TN) and total phosphorus (TP) were 90.7%, 92.8%, 81.9%...
By investigating the nitrogen concentrations in effluents of the horizontal subsurface-flow constructed wetlands under the conditions of different kinds of substrates, residence time and heights, as well as the nitrogen concentrations changes along the flow in the wetlands, the nitrogen removal routes in the wetlands were analyzed. The results demonstrated that the wetland system with zeolites demonstrated...
The technological parameters and running effect in the treatment of municipal sewage by an A2/O + Advanced treatment process are introduced and also aims to improve the application of the BIOLAK process in municipal wastewater treatment. The process flow, process parameters and structure size of the project were introduced. And the treatment effect and designing features were discussed. The running...
The construction of municipal waste water treatment plants is carrying out actively all around the country due to the urgent requirement of the restoration of water pollution. Since 2007, Zhejiang province has taken the lead of possessing a waste water treatment plant in each county. This paper discusses and summarizes acquired achievements and effective measurements of some municipal waste water...
Abundant of estrogens is excreted via human urine, bringing the risk of micro-pollution during nutrients recovery from urine. This study investigated the characteristics of estrogens during the ammonification of urine, and then experiments were conducted to study the adsorption of estrogens on struvite, a potential product to recover nutrients from urine. The results showed that no 17a ethinylestradiol...
Wastewater discharged from the campus is characterized as low-strength and relative centralization of usage period. The feasibility of sequencing batch activated reactor (SBR) treating low strength domestic wastewater generated in a campus were investigated through orthogonal test. Considering the pollution decomposition efficiency and the energy consuming, the optimal parameters for SBR treating...
The effects of multi-stage tidal flow(TF) and subsurface flow(SSF) wetlands on the treatment of sewage were compared. The results showed the removals of NH4+-N (ammonia), TN(total nitrogen), SRP(soluble reactive phosphorus), TP(total phosphorus), CODCr(chemical oxygen demand) using the TF wetland increased by 22%, 5%, 1%, 1% and 5% respectively than using the SSF wetland, which suggested the TF wetland...
In recent years, the research of nitrogen and phosphorus removal in sewage has been a hotspot in the field of wastewater treatment at home and abroad with the worsening of the world-wide eutrophication of water bodies. Improved A2/O oxidation ditch of Wulongkou sewage treatment plant in Zhengzhou has achieved good effect to remove organic matter, nitrogen and phosphorus in sewage. Based on the operation...
The sequencing batch constructed wetland exhibits a high nitrogen removal efficiency. The influences of intermittent and continuous flow modes of SCW on wastewater treatment efficiency were investigated. The experimental results showed that the influent mode has a significant effect on the removal of TN, while the removal of COD and NH4+-N isn't affected remarkably. When temperature is 18°C∼25°C,...
A pre aeration-SBR process was adopted in the treatment of sewage wastewater in Qingdao City. The amount of wastewater was 500t/d, with COD of 500.0mg/L, BOD5 of 235.8 mg/L, SS of 165.8 mg/L and NH4+-N of 60.5 mg/L on average. The average removal rates of these indexes are 92.3%, 95.6%, 92.8% and 86.0% respectively. The effluent concentrations of these indexes are 38.3 mg/L, 10.3 mg/L, 12.0 mg/L and...
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,...
O3-biological zeolite processes was used to treat micro-polluted raw water, The results show that zeolite modified by NaCl is efficiency on ammonia-nitrogen removal, at pH 6~9 and 150 min stirring time, the ammonia-nitrogen removal rate is 71.2%;During the culture of biofilm, ammonia-nitrogen removal rate of water treated by biological zeolite increased after decreasing. When the biofilm is mature,...
Ecological floating bed systems are natural alternatives to technical methods. These are simple, inexpensive, and energy-efficient methods for treating wastewater, and have been widely used all over the world in the past decade. A mesocosm experiments system including 15 units of ecological floating bed grown Lolium multiflorum seedling were attempt used to purify the highly polluted river water in...
A piece of baffle was introduced into conventional SBR reactor, forming a rotative flow pattern and two reaction areas. In the experiment, the influences of factor as hydraulic retention time (HRT), influent NH3-N concentration, and aeration mode, on the nutrient removal from municipal sewage were investigated. The results show us that when the operating period and aeration time are 6.0 h and 4.0...
The impact of organic matter concentration on nitrification was studied in shortcut nitrification SBR. The results showed that the competition of aerobic bacteria had been enhanced and degradation rate of ammonia had been reduced in the system with the increasing of COD concentration and the loading of sludge. Denitrification in the system was apparent, removal rate of total nitrogen was increased...
Various chemistry indicators (such as BOD5, TN and NH4+-N) have been used to identify changes in the performance of constructed wetlands (CW) treating wastewater. However, measurements of biochemical characteristics in CW are laborious. This study aims to investigate whether simple characteristics of diurnal dissolved oxygen are a useful indicator of biodegradable pollution in CW. The variation of...
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...
TiO2 is the most frequently employed photocatalyst in realising complete mineralization of organic pollutants in water treatment. Its large bandgap energy necessitates though UV excitation to induce charge separation within the particle. Nitrogen doped into substitutional sites of TiO2 has shown bandgap narrowing and photocatalytic activity in the visible light. N-doped and non-doped mesoporous titania...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.