不同生物量苦草残体腐解对水体水质的影响  

Effect of Residues Decomposition of Vallisneria natans on Water Quality under Different Biomass Levels in Water Body

作　　者：付贤钟 崔康平[1] 藕翔 汤海燕 韦钊 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《净水技术》2018年第1期123-128,共6页Water Purification Technology

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07205-002)

摘　　要：为探究不同生物量苦草残体腐解对水体水质的影响,在实验室模拟了不同生物量条件下苦草残体腐解过程中各项水质指标的变化规律。结果表明:不同生物量的苦草残体在腐解过程中对水体水质的影响有较大差异,随着生物量的增加,苦草残体腐解对各水质指标的影响程度逐渐加大。由试验分析可知,不同生物量的苦草残体腐解对水体pH值影响不明显;对于DO而言生物量越大,水体中DO越小;随着苦草残体的腐解过程,水体中COD浓度呈上升趋势,在试验末期远高于试验初始值,而且随着生物量的增加,水体中COD浓度也不断增高;同时不同生物量苦草残体腐解过程中均会向水体中释放含氮、含磷物质,生物量越大,向水体中释放的越多。因此为避免过多的苦草残体腐解对水体造成二次污染,必须控制水体中其残留生物量。In order to explore effect of residues decomposition of vallisneria natans on water quality under different biomass levels in water body, the change regulations of water quality indexes in the decomposition process were simulated under different biomass levels in the laboratory. Results showed that effect of the residues on water quality had significant differences under different biomass levels,and with the increase of biomass, the decay of residues gradually deepened the degree of impact on water quality indexes. Easy to find that the biomass of vallisneria natans had unconspicuous impact on pH value in water body by experimental analysis, but p( DO) in water body was lower with the increase of biomass. p(COD) was increased with the decay of residues and it was much higher than initial value at the end of experiment. With the increase of biomass, ρ(COD) showed an increasing trend. Meanwhile, the substances contained nitrogen and phosphorus was released to water in the decomposition process, and the greater biomass, the more release to water. Therefore, to avoid excessive residues of vallisneria natans causing secondary pollution to water, it was necessary to control residual biomass in water body.

关 键 词：苦草 残体腐解 生物量 水质 

分 类 号：X171[环境科学与工程—环境科学]