Study On Removal Of Phosphrus From Small Town Wastewater By SCPR-SBR At Pilot-scale

In recent years, with the sustained rapid development of economy of our country, small towns obtained rapid development, but the accompanying water pollution problems become increasingly prominent. Research shows that the excessive discharge of nitrogen and phosphorous is the main reason of water contamination. So how to reduce concentration of nitrogen and phosphorous of effluent is the research emphasis and difficulties of water treatment.On the basis of lab-scale test, this article explored the Side Chemical Phosphorus Removal Sequencing Batch Reactor Sludge Process(SCPR-SBR) at a pilot scale, offered a reference for the low cost operation of SCPR-SBR. The main research contents includes:the automated design of SCPR-SBR, the installation’s denitrification and dephosphorization capability at long-time running; the main influence factors of phosphorous removal process, which includes operational states, sludge concentration, influent organic loading and Al/P ratio. The main research results are as follows:(1) The design of SCPR-SBR.The processing scale of the new type device is12m3/d. the Ease of Operation is one of the superiority of SCPR-SBR. which consists of aeration, medication, flocculation and precipitation. So the control of operational procedure at design stage solved the technological problem.(2) The optimization of operating conditions for nitrogen and phosphorus removal.①Revealed the influence of sludge concentration to processing property. The studies we have performed demonstrated that the optimum sludge concentration for the anaerobic release phosphorus process and denitrification was about3086.13mg/L.②Revealed the influent organic loading to technological properties. Enhancement of p (COD) of raw water is effective for the anaerobic phosphorus release of the SCPR-SBR system. Maintain phosphorus concentration of raw water at about8mg/L, the optimum influent organic loading was about479.6mg/L for anaerobic release phosphorus process.③Revealed the influence of pH to the performance of side chemical phosphorus removal process. The pH value of town sewage ranged from5.5to7.5at general condition. In the test process, even through the pH value of supernatant ranged from5to8, phosphorus concentration of effluent of the SCPR-SBR system are all under the state limits, suggesting that the SCPR-SBR system can meet the needs of town wastewater treatment.④Revealed the influence of Al/P ratio to the performance of side chemical phosphorus removal process. The change of Al/P ratio has a great influence on the chemical phosphorus removal process. Experimental results show that maintaining the Al/P ratio at1is optimal to dephosphorization. which can not only reduce the reagent cost and the worthless chemical precipitation but also maximize the PAOs’ phosphorus uptake ability.