| 罗龙皂,曾凡健,田光明.藻-菌耦合系统对猪场沼液的净化效果及其影响条件研究[J].农业环境科学学报,2019,38(1):211-219. |
| 藻-菌耦合系统对猪场沼液的净化效果及其影响条件研究 |
| Nutrient removal from piggery digestate using a microalgae-bacteria system and its influencing conditions |
| 投稿时间：2018-03-09 |
| DOI：10.11654/jaes.2018-0320 |
| 中文关键词: 藻-菌系统 猪场沼液 光合产氧 氮磷 有机物 |
| 英文关键词: microalgae-bacteria system piggery digestate photosynthetic oxygen production nitrogen and phosphorus organic pollutant |
| 基金项目:水体污染控制与治理科技重大专项（2014ZX07101-012） |
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| 中文摘要: |
| 针对猪场沼液中氮磷含量高且碳氮比严重失调不利于生化处理这一问题，选用对养猪废水净化效果好的近具刺链带藻和有机物降解效率高的商业化菌剂构建藻-菌系统，探讨其对猪场沼液的净化效果及其运行条件。结果表明，添加有机物降解菌不仅有助于促进微藻的生长，使微藻生物量最大值达到1.47 g·L-1，较未添加菌剂处理提高了23.53%，还能促进废水中碳氮磷的去除效果，其中总有机碳、氨氮和总磷的去除率分别提高了13.40%、3.39%和5.90%。藻-菌系统在不同温度条件下对猪场沼液中碳氮磷的净化效果差异明显。温度为30℃时最利于藻菌系统中微藻的生长，且对总有机碳和总磷的去除效果最好，此时微藻生物量最高值能达到2.21 g·L-1，总有机碳和总磷去除率为72.64%和26.66%；而最利于氨氮去除的温度为40℃，这与高温条件下氨氮易挥发有关。不同光照强度下藻-菌系统对污染物净化能力也不同。随着光照强度的增加，系统中微藻生长速度和光合产氧能力逐渐增加，系统对碳氮磷的去除效果也增强，而当光照强度从400 μmol photons·m-2·s-1增加到600 μmol photons·m-2·s-1时系统中微藻的生长速度和污染物的去除效果并没有提高，可见将光照强度控制在400 μmol photons·m-2·s-1时系统中微藻生物量、总有机碳、氨氮和总磷去除率最高，分别为2.35 g·L-1、57.03%、68.01%和59.66%。研究表明，添加有机物降解菌可以促进微藻的生长，从而促进其对猪场沼液的净化效果，该藻菌系统运行的适宜温度和光照条件分别为30℃和400 μmol photons·m-2·s-1。 |
| 英文摘要: |
| Owing to the high concentrations of nitrogen and phosphorus and the imbalance in the C/N ratio in piggery digestate, it is difficult to treat this wastewater based on traditional biochemical processes. Desmodesmus sp. CHX1 and agent bacteria with high-efficiency organic pollutant removal were used in this study to develop a microalgae-bacteria system that effectively treats piggery digestate. The aim was to investigate the effects of temperature and light on the purification of piggery digestate in the microalgae-bacteria system. The results showed that the addition of organic pollutant degradation bacteria not only improved the growth of Desmodesmus sp. CHXl(the biomass increased by 23.53%), but also increased TOC(total organic carbon), NH4-N(ammonium nitrogen), and TP(total phosphorus) removals by 13.40%, 3.39%, and 5.90%, respectively, during piggery digestate treatment. Temperature was an important factor in nutrient(TOC, NH4+-N, and TP) removal. A temperature of 30℃ was the best condition for the highest microalgae growth rate and TOC and TP removal rates. The biomass of microalgae reached 2.21 g·L-1, and the removal efficiencies of TOC and TP were 72.64% and 26.66%, respectively. The best condition for NH4+-N removal was 40℃, which possibly enhanced NH4+-N volatilization. Light radiation intensity was another key factor for purifying wastewater using the microalgae-bacteria system. By increasing the light intensity, the microalgae growth rate and photosynthetic oxygen production obviously increased, and the TOC, NH4+-N, and TP removal efficiencies improved significantly. However, the growth rate and removal efficiency did not increase when the light intensity ranged from 400 μmol·m-2·s-1 to 600 μmol·m-2·s-1. The highest microalgal biomass and pollutant removal were observed under 400 μmol·m-2·s-1 light intensity, leading to the highest microalgae biomass of 2.35 g·L-1 and the highest removal efficiencies of 57.03%, 68.01%, and 59.66% removal for TOC, NH4+-N, and TP, respectively. |
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