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  • 张华生,王电站,邵一奇,颜成,梁剑茹,周立祥.微生物营养剂浓度对生物沥浸法处理猪场沼液的影响[J].环境工程学报,2019,13(9):2262-2269.DOI:10.12030/j.cjee.201812165    [点击复制]
  • ZHANG Huasheng,WANG Dianzhan,SHAO Yiqi,YAN Cheng,LIANG Jianru,ZHOU Lixiang.Effect of microbial nutrient concentration on bioleaching treatment of anaerobically digested piggery slurry[J].,2019,13(9):2262-2269.DOI:10.12030/j.cjee.201812165   [点击复制]
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微生物营养剂浓度对生物沥浸法处理猪场沼液的影响
张华生1, 王电站1, 邵一奇1, 颜成2, 梁剑茹1, 周立祥1
0
(1.南京农业大学资源与环境科学学院,南京 210095;2.南京贝克特环保科技有限公司,南京 211505)
摘要:
猪场沼液是规模化猪场沼气工程排出的具有高悬浮固体(SS)和高污染负荷的一类高浓度有机废水。采用生物沥浸法调理实现其深度固液分离,对该废水生化处理达标排放意义重大。通过摇瓶实验,研究了猪场沼液在不同浓度营养剂下的生物沥浸处理,并将获得的沥浸泥作为接种物回流,回流比为1∶1,共连续处理6批,测定pH、过滤比阻(SRF)、泥饼重金属含量及滤水水质等指标。结果表明:当营养剂浓度≥15 g·L−1,其处理效果较好且稳定;pH降至3.5以下,SRF降至5.0×1011 m·kg−1左右,脱水速率提高86.1%,泥饼重金属的浸出率高,其中Cu≥49.5%、Zn≥72.7%。沼液经生物沥浸处理后体积减少40%~50%,抽滤水的化学需氧量(COD)、氨氮(NH3)含量、总磷(TP)含量和SS分别从原稀释沼液的27 669.8、1 014.8、582.1 和27 857.1 mg·L-1降至423.8~499.3、671.4~704.0、0.7~1.1和0 mg·L-1,去除率最高可达98.5%、33.8%、99.9%和100%,大大降低了后续生化处理的难度。采用生物沥浸法处理猪场沼液具有良好的应用前景。
关键词:  猪场沼液  微生物营养剂浓度  生物沥浸  脱水性能  重金属
DOI:10.12030/j.cjee.201812165
投稿时间:2018-12-24
基金项目:国家自然科学基金资助项目(21637003)
Effect of microbial nutrient concentration on bioleaching treatment of anaerobically digested piggery slurry
ZHANG Huasheng1, WANG Dianzhan1, SHAO Yiqi1, YAN Cheng2, LIANG Jianru1, ZHOU Lixiang1
(1.College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;2.Nanjing Bact Environmental Solutions Co. Ltd., Nanjing 211505, China)
Abstract:
The anaerobically digested piggery slurry (ADPS) is a kind of organic wastewater with high suspended solids (SS) concentration and pollutant load discharged from large-scale pig farm biogas project. The complete solid-liquid separation through bioleaching conditioning followed by diaphragm pressure filter is of significance in ADPS biological purification. The bioleaching conditioning of ADPS with addition of different concentrations of microbial nutrient were performed through the flask-shaking experiment. Acidic already-bioleached ADPS was taken as an inoculum for next batch bioleaching experiment with the recycling ratio of 1∶1, and the corresponding recycling was conducted for successive six batches. The pH, specific resistance to filtration (SRF), heavy metal content in bioleached cake, and water quality indexes were measured. The results showed that when the concentration of microbial nutrient was ≥15 g·L-1, and good and stable bioleaching effect was achieved as following: the pH value and the SRF of bioleached ADPS could drop below 3.5 and about 5.0×1011 m·kg-1, respectively, and their dewaterability could increase by 86.1%. Under such a condition, the leaching percentages of Cu and Zn of the sludge-borne heavy metals were above 49.5% and 72.7%, respectively. After bioleaching treatment, the ADPS volume decreased by 40%~50%. The chemical oxygen demand (COD) content, ammonia nitrogen (NH3) content, total phosphorus (TP) content and SS of the filtered water could decrease to 423.8~499.3, 671.4~704, 0.7~1.1 and 0 mg·L-1 from the initial 27 669.8, 1 014.8, 582.1 and 27 857.1 mg·L-1, and the corresponding highest removal rates could reach 98.5%, 33.8%, 99.8% and 100%, respectively, which greatly reduced the difficulty in subsequent biochemical treatment. Therefore, bioleaching conditioning for ADPS has a good application prospect.
Key words:  anaerobically digested piggery slurry  microbial nutrient concentration  bioleaching  dewaterability  heavy metal