WANG Xiao-lei,YA Yu-rong,WU Jiang-bo,et al.Application of DN/CN Enhanced Nitrogen Removal Technology in Upgrading and Reconstruction of Wastewater Treatment Plant[J].China Water & Wastewater,2020,36(11):15-20.
DN/CN強化脫氮技術(shù)在污水廠提標改造中的應(yīng)用
- Title:
- Application of DN/CN Enhanced Nitrogen Removal Technology in Upgrading and Reconstruction of Wastewater Treatment Plant
- 關(guān)鍵詞:
- font-size: 10pt; 生物濾池" style="text-decoration-line: none; color: rgb(48, 89, 220);">">生物濾池; 強化脫氮; 碳氮比; 硝態(tài)氮
- Keywords:
- font-size: 10pt; biofilter" style="text-decoration-line: none; color: rgb(48, 89, 220);">">biofilter; enhanced nitrogen removal; carbon to nitrogen ratio; nitrate
摘要:- 以某市城鎮(zhèn)污水處理廠NO3--N濃度較高的生化出水為研究對象，采用反硝化生物濾池+曝氣生物濾池（DN/CN）工藝，研究了碳氮比（C/N值）、進水負荷、溫度等對TN去除效果的影響。結(jié)果表明，當增加的C/N值為3.6、水力負荷≤9.44 m3/(m2·h)［NO3--N最大負荷為4.8 kg/(m3·d)］時，出水TN滿足國標要求（≤10 mg/L）；去除單位質(zhì)量TN需3.7倍COD，碳源不足會導(dǎo)致NO2--N積累和碳源單耗升高；14 ℃時的TN去除率較19 ℃時下降了約15%；反硝化過程中pH值增量和TN去除量存在一個對應(yīng)關(guān)系，可用于反硝化濾池處理效果的輔助判斷。
Abstract:-
The effluent contained high nitrate concentration of a bioreactor in a municipal wastewater treatment plant was treated by a process of denitrification and nitrification biofilters (DN/CN), the effects of carbon to nitrogen (C/N) ratio, influent load and temperature on total nitrogen removal were investigated. When C/N ratio increased by 3.6 and hydraulic load was no more than 9.44 m 3 /(m2·h) ［the maximum nitrate load was 4.8 kg/(m3·d)］, the effluent TN met the national standard requirements (≤10 mg/L). Removing per unit mass TN required 3.7 times COD, and insufficient carbon source would lead to accumulation of nitrite and increase of carbon source per unit consumption. TN removal efficiency at 14 ℃ decreased by about 15% compared with that at 19 ℃. A corresponding relationship between pH increment and TN removal amount was developed, which could be used to assist in estimating the treatment efficiency of the denitrification filter.
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