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Release of phosphorus(P) into effluent of activated sludge process was reported in the recent researches of sludge reduction induced by Tubifex. Decomposition of Tubifex residues is considered to be accompanied by the release of P. A series of experiments were undertaken to evaluate the influence of phosphorus which released from the Tubifex residues to the wastewater treatment system. In present...
In order to reduce the operational cost and completely eliminate Fe2+ ion in the original acid-cleaning fluid for the wastewater treatment process of steel factories, a modified process of two-stage counteract/aeration oxidation is applied. Our results indicate that the effluent quality is better to the first class criteria specified in Integrated Wastewater Discharge Standard (GB 8978-1996). Furthermore,...
fundamental principle of wastewater treatment by natural freezing (WTNF) is discussed with specifying the binary phase diagram for a kind of simulated wastewater with one contaminant X. Three current applications of WTNF are outlined among which unidirectional downward freezing (UDF) is emphatically introduced. The main influencing factors for UDF are reviewed. Utilization of WTNF as a pretreatment...
In membrane bioreactor (MBR) technology, the membrane fouling is the main problem. In this study, the integrated plate MBR was used to treat the municipal wastewater. It is ascertained that the critical flux of polyethersulfone(PES) membrane with MWCO of 70,000 Da is 43.6L/m2.h. And the membrane was made by a domestic firm. The tests revealed that in the operation process of a MBR, membrane fouling...
This paper studied the effect of microbial species grow speed(MPGS), soluble microbial populations(SMPs) on the excess sludge production in the oxic-settling-anoxic process (OSA process), a modification of conventional activated sludge process by inserting a sludge holding tank in a sludge return line. The OSA process may provide a cost-effective way to reduce excess sludge production in activated...
The purification of phosphate contained the secondary effluent of wastewater treatment plant (WWTP) by fly ash was investigated. The effect of pH, adsorbent dosage, and reaction time on purification efficiency was determined. The results showed that the phosphate the removal rate would increase to 83.3% when the adsorbent dosage was 5 g per 100 ml, the pH was neutral, and the reaction time was 4 h...
In undeveloped rural areas, the construction of wastewater treatment devices was restricted for shortage of investment. This paper begins with a brief introduction to the concept of financing and financing models, as well as the three elements of financing, involving financing main body, financing channels, and financing mode. And then, the popular financing models, especially the project financing...
As a major part of the Dianchi Lake, the Caohai Lake is in a serious eutrophication situation, which is imminent for pollution treatment. An improved floating bed, which called combined packing with emergent aquatic plants canna indica, submerged aquatic plants Hydrilla verticillata and aeration device, was used to purify the water taken from the Caohai Lake. Compared with the traditional floating...
In many villages of China, there are a series of problems with the rural domestic wastewater treatment projects, such as non-united organization, non-standard construction, unprofessional operation and lack of supervision. Based on the public property attribute of wastewater treatment facilities, an organization and management system was suggested which was led by the government. A comprehensive coordination...
Two Sequencing Batch Reactors (SBRs) were coupled to treat edible-oil containing wastewater directly. Ten yeast strains were inoculated to the first SBR to treat high-strength oil-containing wastewater. The effluents of the system were further degraded by activated sludge in the second SBR. The results show that each yeast can efficiently decompose edible oil-containing wastewater with the COD removal...
There is obvious effect for eutrophic wastewater treatment by constructing mangrove wetland, but mangrove plants grow under circumstances of a certain salinity, so this may influence the wastewater purification efficiency. Rhizophora stylosa, one of dominant mangrove species in South China, was used to construct simulated wetlands for eutrophic wastewater treatment. After 9 months irrigation to 8...
A modified oxidation ditch process is applied in a full-scale municipal wastewater treatment plant. Compared with the conventional oxidation ditch, the modified oxidation ditch adds some microporous aerators to improve oxygen utilization. The measures bring about a further improvement of nitrogen and phosphorus in the urban wastewater. The monitoring results for one year show that the influent concentrations...
The reason of the water pollution lies in a super mark of the nitrogen, phosphor in the eutrophic lake. Should investigate its reason, keep the lake water from in the eutrophic lake from the source head, Should control into the index sign of the lake water quality; Make all wastewater all treatment, Each the municipal wastewater treatment plants is normal press design scale to circulate also. Improve...
Recently, the study of nitrous oxide (N2O) and methane (CH4) emission in the process of treating domestic wastewater drived more and more people's attention.N2O is by-product of nitrification. Some studies showed that N2O emission influenced by temperature, pH value, DO, salinity and plant species. CH4 was produced in strictly anaerobic conditions through the reduction of CO2 by methane bacteria....
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...
Static and dynamic simulation of effect of carbon source and hydraulic retention time (HRT) on removal performance of nitrogen and phosphorous were carried out by using activated sludge model software Biowin3 for typical anaerobic-anoxic-aerobic (A2/O) process in municipal wastewater treatment plant. The static simulation results showed that increasing C/N and C/P could improve obviously removal performance...
Contents of polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers(PBDEs) from twenty municipal sludge samples of wastewater treatment plants (WWTPs)of the Jiangsu Province in China were determined by gas chromatography-mass spectrometry (GC-MS). The results show that 20 Sludge samples contain polybrominated diphenyl ethers and polybrominated biphenyls; Polybrominated diphenyl ethers range...
A novel swimming bed reactor with no reflux which suit for small scale wastewater treatment was developed. The performance of the reactor for treating domestic wastewater was investigated. Steady removal effect with 71.75% of average COD removal rate was achieved in hydraulic retention times (HRT) of 20.74h ∼ 4.30h. When hydraulic retention time (HRT) was at 8.12h with average NH4+-N volumetric loading...
Dissolved organic matter (DOM) in sewage effluents from Beijing's wastewater treatment plants (WWTPs) were characterized and compared. Results revealed that the characteristics of DOM in sewage effluents were related to the nitrification degree, sewage property and the adopted technology of WWTPs. Good nitrification contributed to the degradation of effluent organic matter and increase the humification...
Anaerobic digestion has been applied in various forms and scales to lessen the organic matter in Swine wastewater, but C/N of the anaerobic digesting fluid is low and biochemistry degradation difference. Treatment of swine wastewater anaerobic digestion fluid By SBBR was studied, finally research indicated: SBBR treated swine wastewater anaerobic digesting fluid directly, COD and NH4+-N removal was...
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