| The removal efficiency of nitrogen and phosporus in low-carbon sewage disposalsystem usually is low. In order to solve this problem, most waste water treatment plantschose to feed carbon resource to improve the effect of nitrogen removal, or addchemical phosphorus removal equipment in the process, but the cost increased. Previousstudy had developed P-SF-SBR technology （Patent NO.: CN101891345A） whichstrengthen simultaneous nitrogen and phosphorus removal in low-carbon sewage underlow aeration amount. Pre-research showed that denitrifying phosphorus removal inP-SF-SBR, but sewage fedding way was too complex. This paper developed a disposalsystem with simultaneous nitrogen and phosphorus removal in low-carbon resourcesewage （LS-SDP）. The technology integrated denitrifying phosphorus removal, thesludge external recycle and sludge alkaline decomposition technology. It simplifiedsewage fedding way, enhanced the denitrifying phosphorus removal ability to obtainpluralism denitrification ways. This dissertation has studied influence of the differentaeration amount level and volume load on pollution change ways and simultaneousnitrogen and phosphorus removal efficiency, in low carbon resource （COD＜200mg/L，COD/TN=2.55.5）. Minewhile, this dissertation has studied the feasibility of sludgealkaline fermentation liquid as the carbon source to phosphorus release, and the impacton main reactor. Results show that:①The aeration amount has great effect on nitrogen and phosphorus removalefficiency in LS-DPS. Especially in aeration amount of1.42m3/h·m3, denitrificationand phosphorus removal efficiency came down at the same time. When the aerationamount was1.0m3/h·m3（at the end of aeration, DO is12mg/L）, TN, TP of effluentwas8.014.3mg/L,0.020.25mg/L, respectively. The pollution concentration ofeffluent could reach the （A level） requirements of Discharge Standard of Pollutants forMunicipal Wastewater Treatment Plant （GB18918-2002） steadily. When the aerationamount was0.71m3/h·m3, TN of effluent could not be stable up to A level, effluent TNstandardized rate was32%. When the aeration amoumt was1.42m3/h·m3, both TN andTP of effluent could not steadily reach the standard, the standardized rate was only40%,5%.②The aeration amount has influence on ways of nitrogen removal, especiallydenitrifying phosphorus. There were denitrifying phosphorus of30.9%, anoxic denitrification of33.3%, and SND of35.8%in LS-SDP process at proper aerationamount of1.0m3/h·m3. Pluralism denitrification system came out. But When aerationamount was at a low level （about0.71m3/h·m3）, denitrifying phosphorus disappeared.③It was feasible for reaching standard operation with increasing of reactorvolume load, but the TN removal efficiency came worse. When volume load was0.19kgCOD/m3·d,0.30kgCOD/m3·d, TN of effluent was under15mg/L, and stable upto A level. The pollutan concentration of latter one was much more stable. Whenvolume load was0.4kgCOD/m3·d, the effluent TN concentration was not steadily anymore, some exceeded the standar, standardized rate was84%.④LS-SDP process has anti-shock phosphorus loading capability. When theinfluent phosphorus was fluctuation （1.486.1mg/L）, the effluent TP was not affected.This ability was closely related to the external recycle process of sludge in LS-SDP.⑤It was feasible to use mixture of alkaline fermentation liquid and sewage（3L:32L） as the carbon source of phosphorus release. The average PO43--P ofphosphorus released cell was42.01mg/L.⑥Affer using of alkaline fermentation liquid, LS-SDP had steadily pollutionremoval efficiency. In low C/N and C/P （4.81,26.99） condition, the COD, NH3-N, TP ofeffluent could reach the （A level） requirements of Discharge Standard of Pollutants forMunicipal Wastewater Treatment Plant (GB18918-2002, TN just reached leval B. TheTN removal efficiency was a little worse. |
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