摘要
为考察磷回收工艺的影响因素,以畜禽养殖废水经厌氧消化处理后的沼气发酵液为研究对象,试验采用间歇式和连续式两种处理方式,间歇式处理时分批处理发酵液,采用NaOH溶液调节方式提升pH值,连续式处理时连续进出水,采用底部曝气方式提升pH值。研究了不同pH条件下有机物、固体悬浮物(SS)、碳酸根以及初始磷负荷对磷回收的影响。结果表明,间歇式处理时,pH值需控制在8.5以上,才能够更好地降低有机物的干扰。pH值为8.0,SS质量浓度达到400mg/L后,磷回收率Vp(t)随SS增大而减小;而在pH值为8.5和9.0时,Vp(t)随SS增大有一定幅度的升高;pH值为9.5时Vp(t)稳定在73%左右。碳酸根浓度达到2mmol/L后,pH值为9.0和9.5时Vp(t)分别降低11%和7.8%,pH值为8.5时影响不大。初始磷负荷为50mg/L的发酵液在不同pH值以及连续式处理曝气8h后Vp(t)均为最高。连续式处理相对于间歇式处理,4个考察因素对磷回收的影响均较小。
Taking the biogas fermentative liquid treated by anaerobic digestion process from livestock wastewater as the research object,the effects of organic compounds,suspended solid（SS）,carbonate,and initial phosphate loads on the phosphorus recovery were investigated in different pH conditions by using two treatment methods：Batch-Influent and Continuous-Influent,using sodium hydroxide solution to lifting pH values in the Batch-Influent,while using aeration stripping from the bottom to lifting pH values in the Continuous-Influent.The results showed that the pH must be controlled higher than 8.5 to reduce the influence of organic compounds in Continuous-Influent.When pH value were higher than 8.0 and the concentration of SS were higher than 400 mg/L,the recovery rate of phosphorus Vp（t）decreased with the rise of concentration of SS while when pH value was 8.5 or 9.0,Vp（t）decreased to some extent;On the other hand,when pH value was 9.5,Vp（t）kept invariant about 73%.When the concentration of carbonate reached 2 mmol/L and pH value was 9.0,Vp（t）decreased by 11%yet,Vp（t）decreased by 7.8%when the concentration of carbonate reached 2mmol/Land pH value was 9.5.There was a little influence when pH value was 8.5.Vp（t）of the fermentative liquid whose initial phosphate loads were 50 mg/L were highest at any pH conditions or after 8 hours aerated.Compared with Batch-Influent,the influence of the four factors on the phosphorus recovery was less than Continuous-Influent.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第8期265-271,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
广东省科技计划项目(2008b030302044)
华南农业大学资源环境学院2008年科技创新项目
关键词
沼气
磷
回收
影响因素
PH
发酵液
biogas
phosphorus
recovery
influence factor
pH
fermentative liquid
