吉林建筑工程学院学报
吉林建築工程學院學報
길림건축공정학원학보
JOURNAL OF JILIN ARCHITECTURAL AND CIVIL ENGINEERING INSTITUTE
2014年
6期
24-27
,共4页
高浓度氨氮废水%氨氮回收%化学沉淀法%鸟粪石结晶
高濃度氨氮廢水%氨氮迴收%化學沉澱法%鳥糞石結晶
고농도안담폐수%안담회수%화학침정법%조분석결정
high NH3 -N concentration wastewater%recover of ammonia nitrogen%chemical precipitation%crystalliza-tion
本文采用MgSO4·7H2 O和Na2 HPO4·12H2 O,使含有高浓度NH3-N废水中的氨生成MgNH4 PO4·6H2 O结晶沉淀,以此回收废水中高浓度NH3-N.本研究考察了pH值、反应时间t、试剂用量配比对废水中NH3-N去除率的影响.研究结果表明,反应的适宜 pH 值为8~10之间,过高的 pH 会破坏形成的晶体结构,导致固定氨从MgNH4 PO4·6H2 O中游离出来,对氨氮去除产生不利影响.在参数值pH值为8.0、反应时间t为20min、各试剂离子的量的比Mg2+∶NH4+∶PO43-=1.5∶1∶1.5的最佳条件下,废水总中NH3-N浓度由初始1981mg/L降低至5mg/L,去除率达95%.化学沉淀法在回收废水中高浓度氨氮的同时,形成了鸟粪石结晶沉淀,是一种优良的缓释肥原料.
本文採用MgSO4·7H2 O和Na2 HPO4·12H2 O,使含有高濃度NH3-N廢水中的氨生成MgNH4 PO4·6H2 O結晶沉澱,以此迴收廢水中高濃度NH3-N.本研究攷察瞭pH值、反應時間t、試劑用量配比對廢水中NH3-N去除率的影響.研究結果錶明,反應的適宜 pH 值為8~10之間,過高的 pH 會破壞形成的晶體結構,導緻固定氨從MgNH4 PO4·6H2 O中遊離齣來,對氨氮去除產生不利影響.在參數值pH值為8.0、反應時間t為20min、各試劑離子的量的比Mg2+∶NH4+∶PO43-=1.5∶1∶1.5的最佳條件下,廢水總中NH3-N濃度由初始1981mg/L降低至5mg/L,去除率達95%.化學沉澱法在迴收廢水中高濃度氨氮的同時,形成瞭鳥糞石結晶沉澱,是一種優良的緩釋肥原料.
본문채용MgSO4·7H2 O화Na2 HPO4·12H2 O,사함유고농도NH3-N폐수중적안생성MgNH4 PO4·6H2 O결정침정,이차회수폐수중고농도NH3-N.본연구고찰료pH치、반응시간t、시제용량배비대폐수중NH3-N거제솔적영향.연구결과표명,반응적괄의 pH 치위8~10지간,과고적 pH 회파배형성적정체결구,도치고정안종MgNH4 PO4·6H2 O중유리출래,대안담거제산생불리영향.재삼수치pH치위8.0、반응시간t위20min、각시제리자적량적비Mg2+∶NH4+∶PO43-=1.5∶1∶1.5적최가조건하,폐수총중NH3-N농도유초시1981mg/L강저지5mg/L,거제솔체95%.화학침정법재회수폐수중고농도안담적동시,형성료조분석결정침정,시일충우량적완석비원료.
A lab - scale study was conducted to precipitate the ammonia from high NH3 - N concentration wastewater in the form of magnesium ammonium phosphate( MAP) . The influences of pH value, reactive time and removal rate of ammonia nitrogen were tested. The result shows that the feasible pH values of crystallization and pre-cipitation were from 8 to 10 . The structure of structure crystallization was destroyed under high pH value condition that resulted in ammonia nitrogen dissociating from MAP, which reduced the removal rate of ammonia nitrogen. Re-sults also demonstrated that ammonia nitrogen was effectively reduced from initial 1981mg/L to final 5mg/L, which removal efficiency reached 99% with crystallization and precipitation method when the optimal pH, precipitation time mole ratio of Mg2+, NH4 +, PO43- were 8. 0, 20 min and 1. 5∶1∶1. 5 respectively.
