共查询到18条相似文献,搜索用时 203 毫秒
1.
将表面流湿地与潜流湿地相结合,处理铁路车站生活污水,分析湿地系统对CODCr、BOD5、TP、TN、SS的处理效果。研究结果表明,复合型人工湿地系统对CODCr、BOD5、SS均有较高的去除率;进水中CODCr、TP浓度的波动对出水浓度影响不大,复合型人工湿地系统具有良好的抗冲击能力。 相似文献
2.
不同植物配置人工湿地冬季生活污水净化效果比较 总被引:8,自引:1,他引:7
以某三级串联水平潜流人工湿地污水处理工程为实验基地,研究了5种华南地区常见湿地植物的选择和配置对净化冬季生活污水的影响,为华南地区人工湿地合理优化配置植物提供一定的依据。结果表明:人工湿地系统在冬季对COD、BOD5、TP和大肠菌群仍有较好的去除效果,对TN的去除效果较差。在实验条件下,COD和BOD5的降解主要发生在第一级湿地单元,TP和TN的降解主要发生在第三级湿地单元。三级串联湿地系统净化效果较佳的植物搭配是:第一级栽种水生美人蕉,第二级栽种再力花,第三级栽种菖蒲。 相似文献
3.
4.
5.
6.
7.
北方某人工湿地净化能力分析 总被引:1,自引:1,他引:0
在对北方某人工湿地长期观测取得的大量详尽数据的基础上,分析了人工湿地系统总体净化能力和潜流人工湿地水质动态变化特征。结果表明:该人工湿地示范工程对水质净化效果较为明显,对各类污染物的去除率平均可达40%;潜流人工湿地可对污水进行深度处理,对BOD5、NH4-N的去除效果最好,去除率为80%~90%,对NO3-N、TN的去除效果较好,去除率为65%~75%,对CODMn和SS的去除效果一般,去除率为40%~60%,对TP的去除效果随着时间推移逐渐减弱,碎石吸附对TP去除起主要作用。 相似文献
8.
9.
《水资源开发与管理》2015,(2)
海淀区北部新区某污水处理厂进行了长达一年的进出水水质监测,监测指标为化学需氧量(CODCr)、5日生化需氧量(BOD5)、氨氮(NH3-N)、总氮(TN)和总磷(TP)共5项。本文分析对比了进出水水质情况,着重研究了进水污染物浓度与污染物去除效率的关系,得到了该污水处理厂5项指标的最佳进水浓度分别为CODCr460mg/L、TN 66mg/L、TP 2.5mg/L、NH3-N50mg/L、BOD5113mg/L。 相似文献
10.
官厅水库黑土洼人工湿地系统经过一年多的运行,经历了严寒冬季的考验,获取了1万多组监测数据。通过对BOD5等指标去除率分析,人工湿地对Orth—D、TP、CODMn去除率较多,TN、NH4^+-N、NO^-3-N处理效果一般。建议二期工程进一步改进工艺,促进有机物的降解。 相似文献
11.
G L Cirelli S Consoli V Di Grande M Milani A Toscano 《Water science and technology》2007,56(3):183-191
The paper reports the results of an investigation on a H-SSF constructed wetland for tertiary treatment in a small community located in eastern Sicily, Italy. The system is designed to reuse wastewater for the irrigation of olive orchards covering about 150 hectares. From March 2001 to September 2005, wastewater samples were collected and the following chemical-physical parameters were determined according to Standard Methods: temperature, pH, EC, DO, TSS (105degrees C), BOD5, COD, TN, TP. The following microbiological parameters were also evaluated: total coliforms, faecal coliforms, Escherichia coli, faecal streptococci, Salmonella, helminth eggs. Mean removal efficiencies ranged from 77 to 92% (TSS), 37 to 72% (BOD5), 51 to 79% (COD), 97 to 99.5% (E. coli). Removal efficiency of Salmonella and helminth eggs was always 100% in all samples; however, only 150% of total samples matched the limit of E. coli (< 50 CFU/100 mL) fixed by Italian legislation for wastewater reuse. 相似文献
12.
土壤过滤系统处理农村生活污水的
试验研究 总被引:1,自引:0,他引:1
采用一种土壤过滤系统处理农村生活污水,考察了该工艺对CODCr、BOD5、NH3-N、全氮(TN)和全磷(TP)的去除效果。实验结果表明,当水力负荷约为0.05 m3/(m2·d), 水力停留时间为3 d时。该土壤过滤系统对CODCr、BOD5、NH3-N、全氮(TN)和全磷(TP)的去除效果较好,平均去除率分别达到84.6%、83.3%、64.3%、59.8%和70%。出水CODCr约为18.3~42.1 mg/L,BOD5约为8.9~17.3 mg/L,NH3-N约为11.2~17.7 mg/L,TN约为21.2~31.3 mg/L,TP小于2.0 mg/L,出水水质优于农田灌溉水质标准(GB 5084—2005)。气温变化和进水污染物浓度对处理效果影响明显。总体上来讲,温度大于22 ℃时,进水污染物浓度越低处理效果越好。 相似文献
13.
Performance of a combined eco-system of ponds and constructed wetlands for wastewater reclamation and reuse. 总被引:1,自引:0,他引:1
An on-site study on the operational performance of a combined eco-system of ponds and SF constructed wetland for municipal wastewater treatment and reclamation/reuse in Donging City, Shandong, China was carried out from January 2001 through October 2003. The removal efficiencies for various main parameters were: TSS 84.8 +/- 7.3%, BOD5 87.2 +/- 5.3%, CODCr 70.2 +/- 18.6%, TP 52.3 +/- 23.1%, and NH(3)-N 54.8 +/- 23.9% with effluent concentration of TSS 9.12 +/- 5.12 mg/l, BOD5 6.44 +/- 4.58 mg/l, CODCr, 42.8 +/- 6.7 mg/l, TP 0.94 +/- 0.27 mg/l and NH(3)-N 7.95 +/- 2.36 mg/l. In addition, the removal efficiencies for faecal coliforms and total bacteria were > 99.97% and > 99.998% respectively, which well meet Chinese National standards for effluent quality of municipal wastewater treatment plants. The composition of TSS was closely related to CODCr and BOD5 variations, and nitrification-denitrification is the major mechanism of nitrogen removal both in ponds and in wetlands. In addition, sedimentation also played an important role in the removal of TSS, nitrogen, phosphorus and BOD5. The removal efficiencies of various parameters, the number of species and biomass of biological community in the system increased gradually with the ecological maturation. 相似文献
14.
15.
Low effluent nutrient technologies for wastewater treatment. 总被引:1,自引:0,他引:1
The USEPA (2001) water quality nutrient criteria will have a significant impact on water pollution control industry due to stringent N and P requirements. This paper presents an update of findings on successful total N (TN) and total P (TP) technologies being implemented at existing wastewater treatment plants (WWTP) to achieve low TN and TP effluents and some key challenges in achieving lower levels. Plants consistently achieving <5 mg TN/L and < 0.5 mg TP/L were identified from a worldwide literature search and plant data collection. Technology gaps and research needs to improve successful technologies to achieve very low TN and TP effluents are summarised in this paper. The dissolved and colloidal organic N have been identified as major challenges in achieving very low levels of TN. Technical and economic challenges to achieve very low TP effluents include alkalinity deficiency, high chemical usage, high sludge production and lack of sufficient influent BOD for biological P uptake. 相似文献
16.
Ahmadian M Yousefi N Van Ginkel SW Zare MR Rahimi S Fatehizadeh A 《Water science and technology》2012,66(4):754-760
In this study, treatment of slaughterhouse wastewater by electrocoagulation was investigated in batch system using Fe electrodes. The effect of various variables such as electrode number, current density and operating time was tested. Pollutant removal efficiency increased with increasing electrode number and operating time. The biochemical oxygen demand (BOD(5))(,) chemical oxygen demand (COD), total suspended solid (TSS), and total nitrogen (TN) removal efficiencies using eight electrodes at a contact time of 50 min and a current density of 10 A/m(2) were 66, 62, 60, and 56%, respectively. Higher electrode numbers will allow shorter operating times to achieve certain removal efficiencies. Also, removal efficiencies increased by increasing the current density; the highest removal efficiencies of BOD(5,) COD, TSS, and TN at a contact time of 50 min and a current density of 25 A/m(2) were 97, 93, 81, and 84%, respectively. The results also show that the reactor pH varies directly with the current density; at 25 A/m(2), the reactor pH increased from an initial value of 7.1 to 7.7 after 50 min. The experimental results showed that the kinetics of BOD(5), COD, TSS and TN removal could be fitted adequately using a first order kinetic model (higher R(2)). 相似文献
17.
Vegetated drainage ditches (VDD) as a type of constructed wetland primarily serve to remove and store excess water associated with irrigation and storm events. Current research suggests using a VDD as an additional practice in the mitigation of surface water pollution. The VDD for water treatment of the Glinscica River was constructed in 2006. The efficiency of the system was evaluated in 2008 and 2009 regarding the reduction of SS, COD, BOD5, NH4-N, NO3-N, NO2-N, TN, ON and TP. The microbiological association developed in the VDD was analyzed with a focus on the identification and quantification of the narG gene as a denitrification indicator. This paper discusses the efficiency of pollution removal and the distribution of the narG gene within the VDD. The results showed that the highly fluctuating water regime was the main reason for the even distribution and abundance of the narG gene throughout the system, regardless of oxygen saturation or the nutrient status of the wastewater. With the exception of SS, pollutant concentrations met the permitted outflow levels. 相似文献
18.
Two grassed bioretention cells were constructed in the easement of a bridge deck in Knightdale, North Carolina, USA, in October, 2009. One was intentionally undersized ('small'), while the other was full sized ('large') per current North Carolina standards. The large and small cells captured runoff from the 25- and 8-mm events, respectively. Both bioretention cells employed average fill media depths of 0.65 m and internal water storage (IWS) zones of 0.6 m. Flow-proportional, composite water quality samples were collected and analyzed for nitrogen species, phosphorus species, and TSS. During 13 months of data collection, the large cell's median effluent concentrations and loads were less than those from the small cell. The small cell's TN and TSS load reductions were 84 and 50%, respectively, of those achieved by the large cell, with both cells significantly reducing TN and TSS. TP loads were not significantly reduced by either cell, likely due to low TP concentrations in the highway runoff which may have approached irreducible levels. Outflow pollutant loads from the large and small cell were not significantly different from one another for any of the examined pollutants. The small cell's relative performance provides support for retrofitting undersized systems in urbanized areas where there is insufficient space available for conventional full-sized stormwater treatment systems. 相似文献