本文選題：溫度 + 反硝化　； 參考：《農(nóng)業(yè)工程學(xué)報(bào)》2017年08期

【摘要】：在水資源短缺的北京地區(qū)利用再生水回補(bǔ)城市河湖,一方面對(duì)于水資源的可持續(xù)利用有著十分重要的作用,另一方面也可能帶來地下水環(huán)境的潛在污染風(fēng)險(xiǎn)。該文采用100 cm砂壤土柱模擬(河湖岸底)土地滲濾系統(tǒng),設(shè)置定水頭淹水、交替淹水落干、定流速補(bǔ)水和側(cè)向補(bǔ)水4種不同再生水回補(bǔ)方式,研究再生水中硝態(tài)氮(NO_3-N)在土地滲濾系統(tǒng)中的去除效果和遷移轉(zhuǎn)化規(guī)律。結(jié)果表明,當(dāng)水力負(fù)荷在0.25~2.65 cm/d范圍內(nèi)時(shí),滲濾系統(tǒng)對(duì)NO_3-N的去除率隨著水力負(fù)荷的增大而減小;側(cè)向補(bǔ)水方式下滲濾系統(tǒng)對(duì)NO_3-N的去除效果最優(yōu),平均去除率高達(dá)96.1%。在定水頭淹水和側(cè)向補(bǔ)水方式下,系統(tǒng)對(duì)NO_3-N的去除主要發(fā)生在土柱的上部,而交替淹水落干和定流速補(bǔ)水條件下,土柱中下部對(duì)NO_3-N也有一定的去除作用。滲濾系統(tǒng)對(duì)NO_3-N的去除主要取決于系統(tǒng)內(nèi)部微生物的分布情況,土層中的反硝化細(xì)菌數(shù)量越大,該土層對(duì)NO_3-N的去除率就越高。當(dāng)水溫在15~32℃范圍內(nèi)變化時(shí),定水頭淹水和交替淹水落干補(bǔ)水方式下,系統(tǒng)對(duì)NO_3-N的去除率與溫度分別呈指數(shù)和冪函數(shù)關(guān)系。該研究表明土地滲濾系統(tǒng)可實(shí)現(xiàn)再生水的進(jìn)一步凈化處理,可為再生水安全回補(bǔ)河湖提供參考。
[Abstract]:In Beijing, where water resources are short, reclaimed water can be used to replenish urban rivers and lakes. On the one hand, it plays an important role in the sustainable utilization of water resources, on the other hand, it may bring potential pollution risk to groundwater environment. In this paper, a 100 cm sandy loam column is used to simulate the land leachate system. Four different reclaimed water recharge methods are set up, such as constant head flooding, alternate flooding, constant flow rate and lateral rehydration. The removal efficiency and migration and transformation of NO3-N in regenerated water in soil leachate system were studied. The results show that when the hydraulic load is within the range of 0.25 ~ 2.65 cm/d, the removal rate of NO_3-N decreases with the increase of hydraulic load, and the average removal rate of NO_3-N is up to 96.1% under the lateral recharge mode. Under the condition of constant head flooding and lateral rehydration, the removal of NO_3-N mainly occurs in the upper part of the soil column, while under the condition of alternate flooding and constant flow rate, the NO_3-N is also removed from the middle and lower part of the soil column. The removal of NO_3-N by leachate system mainly depends on the distribution of microbes in the system. The larger the number of denitrifying bacteria in soil layer, the higher the removal rate of NO_3-N in the soil layer. When the water temperature varies in the range of 1532 鈩，

本文編號(hào)：1898352