环境污染与防治
環境汙染與防治
배경오염여방치
ENVIRONMENTAL POLLUTION AND CONTROL
2010年
2期
33-36
,共4页
城市污泥填埋气%集气井收集系统%影响半径%数学模型
城市汙泥填埋氣%集氣井收集繫統%影響半徑%數學模型
성시오니전매기%집기정수집계통%영향반경%수학모형
sludge landfill gas%vertical well gas extraction%radius of influence%mathematical model
对城市污泥填埋场填埋气集气井收集系统进行了优化研究,考察了城市污泥水平方向的渗透系数(以下简称污泥渗透系数)对集气井影响半径的影响、集气井抽气负压随填埋时间的变化规律、填埋气的经济收集年限.结果表明,当抽气负压为25 000～30 000 Pa时,污泥渗透系数分别取1.04×10~(-7)、2.60×10~(-8)、1.04X10~(-8)m~2/(Pa·s)时,集气井的影响半径分别为10.0～11.0、6.0～7.0 、5.0～5.5 m,过小的污泥渗透系数会严重影响集气井的集气效率,因此污泥渗透系数最好不应小于1.00×10~(-8)>m~2/(pa·s);随城市污泥填埋时间的增加,集气井抽气负压总体呈指数型降低趋势,从第8年起,抽气负压由起初的25 000 Pa降低到5 000 Pa以下,此时CH_4产率约为2 kg/(m~3·a),到第20年时CH_3产率接近于零,故从城市污泥填埋后第8年起,对填埋气继续进行收集的意义已经不大.
對城市汙泥填埋場填埋氣集氣井收集繫統進行瞭優化研究,攷察瞭城市汙泥水平方嚮的滲透繫數(以下簡稱汙泥滲透繫數)對集氣井影響半徑的影響、集氣井抽氣負壓隨填埋時間的變化規律、填埋氣的經濟收集年限.結果錶明,噹抽氣負壓為25 000～30 000 Pa時,汙泥滲透繫數分彆取1.04×10~(-7)、2.60×10~(-8)、1.04X10~(-8)m~2/(Pa·s)時,集氣井的影響半徑分彆為10.0～11.0、6.0～7.0 、5.0～5.5 m,過小的汙泥滲透繫數會嚴重影響集氣井的集氣效率,因此汙泥滲透繫數最好不應小于1.00×10~(-8)>m~2/(pa·s);隨城市汙泥填埋時間的增加,集氣井抽氣負壓總體呈指數型降低趨勢,從第8年起,抽氣負壓由起初的25 000 Pa降低到5 000 Pa以下,此時CH_4產率約為2 kg/(m~3·a),到第20年時CH_3產率接近于零,故從城市汙泥填埋後第8年起,對填埋氣繼續進行收集的意義已經不大.
대성시오니전매장전매기집기정수집계통진행료우화연구,고찰료성시오니수평방향적삼투계수(이하간칭오니삼투계수)대집기정영향반경적영향、집기정추기부압수전매시간적변화규률、전매기적경제수집년한.결과표명,당추기부압위25 000～30 000 Pa시,오니삼투계수분별취1.04×10~(-7)、2.60×10~(-8)、1.04X10~(-8)m~2/(Pa·s)시,집기정적영향반경분별위10.0～11.0、6.0～7.0 、5.0～5.5 m,과소적오니삼투계수회엄중영향집기정적집기효솔,인차오니삼투계수최호불응소우1.00×10~(-8)>m~2/(pa·s);수성시오니전매시간적증가,집기정추기부압총체정지수형강저추세,종제8년기,추기부압유기초적25 000 Pa강저도5 000 Pa이하,차시CH_4산솔약위2 kg/(m~3·a),도제20년시CH_3산솔접근우령,고종성시오니전매후제8년기,대전매기계속진행수집적의의이경불대.
The vertical extraction well based sewage sludge landfill gas collection system was optimum designed to investigated the effect of permeability coefficient on influence radiuses of vertical extraction well, change of pumping negative pressure with landfill time, and economical period for landfill gas collecting. Under the pumping negative pressure of 25 000-30 000 Pa, lower permeability coefficient resulted in smaller radiuses of influence, when permeability coefficient was 1. 04×10~(-7) , 2. 60×10~(-8), 1. 04×10~(- 8) m~2(Pa·s) , the obtained radiuses of influence were 10. 0-11. 5, 6. 0-8. 0, 5. 0-6. 0 m, respectively. Lower permeability coefficient could decrease the efficiency of vertical extraction well for gas collecting, so the permeability coefficient of sludge had better higher than 10~( -8) m~2/(Pa·s). The pumping negative pressure reduced exponentially with increasing the landfill time. After 8 year of landfill, pumping negative pressure decreased from 25 000 Pa to lower than 5 000 Pa with CH_4 yield of 2 kg/(m~3·a), while after 20 year of landfill, CH4 yield was approaching to 0. Therefore, it was no sense in collecting the landfill gas after 8 year of landfill.
