牡蛎壳作生物滞留填料对城市地表径流污染物去除效果研究

选择磷吸附性能最强的牡蛎壳作为填料,在实验室构建3个生物滞留模拟装置(A柱:养殖牡蛎壳;B柱:海滩牡蛎壳;C柱:养殖牡蛎壳存在淹没区),采用道路径流模拟配水作为进水,研究牡蛎壳作为填料对青岛市城市径流常见污染物氮磷及COD的处理效果,并对各污染物去除机理进行探讨。结果表明:3种牡蛎壳填料的生物滞留设施对总磷的去除效果最好,在进水磷浓度为0.57～1.83 mg/L条件下,无淹没区装置平均去除率为96.12%,存在淹没区的装置平均去除率为91.02%。养殖牡蛎壳与海滩牡蛎壳对磷的去除效果并无明显差异,淹没区不利于磷的去除。在前期进水过程中(前5次进水)3个模拟装置氨氮(NH_4~+)的出水浓度高于进水浓度,延长落干期后,装置的NH_4~+去除率均上升,B柱NH_4~+平均去除率(58.83%)相对于A柱(48.77%)及C柱(53.06%)更高,有无淹没区对NH_4~+去除并无明显影响。由于填料中有机物的渗沥,首次进水出现严重COD淋出,在随后的进水过程中,COD去除效果迅速上升并稳定,3个模拟柱去除率分别为50.34%,23.47%和47.75%。由于反硝化作用受阻,对硝氮(NO_3~-)的去除效果不佳。整体看来,养殖牡蛎壳可以应用于青岛市生物滞留设施的填料,为加强滞留设施NO_3~-的去除效果,还需要采用强化脱氮措施。     

Long-term effects of bone char and lignocellulosic biochar-based soil amendments on phosphorus adsorption–desorption and crop yield in low-input acidic soils

Although the addition of biochar has been shown to reduce the phosphorus (P) adsorption capacity of soil, quantitative evidence of this has mainly been provided by incubation experiments and it is therefore essential to conduct long-term field trials to draw general conclusions. It is largely unknown whether bone char has a greater effect than lignocellulosic biochar on P adsorption–desorption processes and crop yield. The aim of this study was to determine the long-term (8 years) effect of bone char and biochar on P adsorption–desorption and crop yield in low-input acidic soils. The results showed that bone char decreased the maximum P adsorption capacity (Q_m) by 10% and increased the desorption capacity (D_s) by 150% compared with the control (i.e. without a soil amendment). The desorption ratio was highest for the bone char treatment (10.3%) and three times more than the control. Plant-available P was seven times greater under bone char than the control. There was no variation in adsorption–desorption characteristics, desorption ratio and plant-P available content between bone char and lignocellulosic biochar treatments. The average yield increment following the application of bone char and biochar was 1.7 and 1.4 Mg ha⁻¹ for maize and 1.8 and 1.9 Mg ha⁻¹ for soya bean, respectively. Despite the low application rate (4 t ha⁻¹ year⁻¹), these findings demonstrated that the long-term application of bone char and biochar-based amendments enhanced P availability in low-input cropping systems, mainly by altering the P adsorption and desorption capacity of soils.     

Nutrient Removal in Pilot-Scale Constructed Wetlands Treating Eutrophic River Water: Assessment of Plants, Intermittent Artificial Aeration and Polyhedron Hollow Polypropylene Balls

Seven experimental pilot-scale subsurface vertical-flow constructed wetlands were designed to assess the effect of plants [Typha latifolia L. (cattail)], intermittent artificial aeration and the use of polyhedron hollow polypropylene balls (PHPB) as part of the wetland substrate on nutrient removal from eutrophic Jinhe River water in Tianjin, China. During the entire running period, observations indicated that plants played a negligible role in chemical oxygen demand (COD) removal but significantly enhanced ammonia–nitrogen (NH₄–N), nitrate–nitrogen (NO₃–N) total nitrogen (TN), soluble reactive phosphorus (SRP) and total phosphorus (TP) removal. The introduction of intermittent artificial aeration and the presence of PHPB could both improve COD, NH₄–N, TN, SRP and TP removal. Furthermore, aerated wetlands containing PHPB performed best; the following improvements were noted: 10.38 g COD/m² day, 1.34 g NH₄–N/m² day, 1.04 g TN/m² day, 0.07 g SRP/m² day and 0.07 g TP/m² day removal, if compared to non-aerated wetlands without PHPB being presented.     

厌氧/缺氧/好氧生物接触氧化处理低碳氮比污水的物料平衡

为了提高低碳氮比污水的治理效果,提出了厌氧/缺氧/好氧-生物接触氧化脱氮除磷工艺(anaerobic anoxic oxic-biological contact oxidation,A2/O-BCO),研究了该工艺处理生活污水的脱氮除磷性能,建立了该系统处理过程的碳(以化学需氧量计,chemical oxygen demand,COD)、氮、磷的物料衡算公式,同时分析评价了不同硝化液回流比(100%,200%,300%,400%)下各指标的物料平衡情况。结果表明,该工艺在充分利用原水碳源、深度脱氮除磷方面具有较强的优势,系统COD主要在A2/O中厌氧段被利用,通过反硝化聚磷菌反硝化除磷脱氮;系统COD的物料衡算公式平衡百分比分别为96.4%、99.6%、98.7%和98.3%,氮的物料衡算公式平衡百分比分别为99.7%、98.2%、99.2%和96.5%,磷的物料衡算公式平衡百分比分别为92.0%、98.1%、93.3%和90.4%;荧光原位杂交表明生物膜中有厌氧氨氧化菌存在,且其数量占全菌比例的0.6%~2.7%,生物接触氧化的氮损失可能是由于发生了厌氧氨氧化反应;在硝化液回流比为300%时,系统氮、磷去除效果最好,出水达到国家城镇污水处理厂污染物排放标准一级A标准。该研究有助于更好地理解和分析工艺系统有机物、氮和磷的分布及变化情况,并且为评价试验数据的可靠性以及数学模型的建立提供了理论依据和指导,能更好地推广到分散型、量小且日变化系数较大的农村生活污水的治理事业中。     

Transport and Retention of Phosphorus Pollutants in the Landscape with a Traditional,Multipond System

The landscape structure of a multipond system, runoff type andP-pollutant transport in an experimental watershed was studiedduring 1995 and 1998. A multipond system is a wetland system composed with many tiny ponds and ditches. In this watershed, it was found that such a system effectively controls the hydrological process through its huge storage capacity. The multipond system has a high interaction of land/water ecotones,which decreases the flow velocity systematically and results ina high sedimentation of the particulate matters.The multipond system intercepts runoff and creates either continuous or discontinuous flow. The retention efficiency of the system was very high in both cases but differed in nature. During continuous runoff on 1 May 1998, in a subwatershed Baojiatang, the retention rates of water, total phosphorus (TP),dissolved phosphorus (DP) and suspended solids (SS) by the multipond system were 83.0, 93.9, 90.9 and 94.9%, respectively.During discontinuous runoff on 29 June 1998, runoff volume generated from all lands was 1841 m³, but no surface waterwas exported and the system retention rates of TP, DP and SS were nearly complete. The removal of particulate phosphorus bythe system was more effective than removal of DP and thus DP wasthe main form of phosphorus exported from the watershed duringcontinuous flow. Because of such control, the export amount ofphosphorus was greatly reduced. The output of TP and DP was 0.013 and 0.012 kg ha^-1, respectively, from Liuchahe watershed in 1995, and they were 0.037 and 0.030 kg ha^-1 in 1998 correspondingly.     

Midwest (U.S.A.) reservoir water quality modification I. Particulate parameters

Both qualitative and quantitative approaches were used to evaluate the impact of a flood control, low flow augmentation reservoir on seven water quality parameters: Suspended solids and total phosphate (particulate parameters); BOD, COD, and ammonia (O₂-demanding parameters); and orthophosphate and nitrite plus nitrate N (soluble nutrients). Fourteen years of weekly sampling data above, in, and downstream of the reservoir both before and after the reservoir became operational were analyzed. This paper considers the effects of the reservoir on the particulate parameters. There was a dramatic decrease in both suspended solids and total phosphate concentrations in the reservoir discharges, particularly during periods of high river flows and high reservoir inflow parameter concentrations. At all sampling stations, the annual parameter loading rates (kg ha^?1 yr^?1) correlated linearly with annual runoff (cm yr^?1). The suspended solids removal efficiency of the reservoir was dependent on annual runoff and averaged about 90%. Non-point source contributions of suspended solids were well over 99% when annual runoff exceeded 6.57 cm y^?1 and over 95% even when annual runoff was as low as 1.63 cm yr^?1     

2种植物浮床对含抗生素养殖废水的净化效果

[目的]探讨湿地植物种类、浮床覆盖面积和处理时间3个因素对含抗生素养殖废水净化效果的影响,为高效利用湿地植物浮床技术去除养殖废水中的传统污染物和抗生素提供依据。[方法]分别利用巴拉草(Brachiaria mutica)和短叶茳芏(Cyperus malaccensis Lam. var.brevifolius)构建了植物浮床,每种植物浮床设置了20%,40%,60%这3个水面覆盖面积,监测了植物浮床在不同处理时间对养殖废水中的化学需氧量(COD)、氮磷和磺胺嘧啶的净化效果。[结果]各处理水质各指标随着运行时间持续变好:pH值变中性;溶解氧(DO)含量增加;氧化还原电位(ORP)上升;COD,氨氮(NH_3-N),总氮(TN),总磷(TP)和抗生素磺胺嘧啶(SDZ)浓度持续降低;不同植物种类对水体pH值和ORP值,DO和COD的含量无显著影响,但显著影响水体营养盐的去除;巴拉草浮床对水体中NH_3-N,TN和TP的去除效果优于短叶茳芏浮床;两种植物对SDZ的去除效率相当;总体上,60%的覆盖面积更加有利于水体中污染物的去除,但不利于DO扩散。[结论] 60%覆盖面积的巴拉草浮床,在运行47 d时,去除养殖废水中COD(88%),NH_3-N(97%),TN(89%),TP(94%)和SDZ(43%)的效果最好。     

Organic mulch biowall for PAH contaminated groundwater remediation

Organic mulch was used as an alternative supporting material in permeable, biological, barrier walls to prevent migration of PAHs. Three types of organic mulch, cypress bark (C), hardwood bark (H) and pine bark nuggets (P) were selected as potential media to capture pollutants or to support PAH-degrading microorganisms. Among the media, the hardwood mulch was selected for biowall testing. To simulate the fate and transport of PAHs in the subsurface biowall under aerobic conditions, two lab scale mulch-biofilm column reactors were operated. Naphthalene was chosen as the model PAH in these studies and was supplied at a loading rate of 50.9 g m⁻² day⁻¹. During the initial operation period of up to 372 pore volumes, the PAH removal efficiency remained stable at over 99%, due to sorption and biodegradation. After that, the mulch-biowall system showed variable removal efficiencies, in the range of 77–99.99%.     

Effect of High Organic Loading Rates of Particulate and Dissolved Organic Matter on the Efficiency of Shallow Experimental Horizontal Subsurface-flow Constructed Wetlands

Two identical experimental subsurface-flow constructed wetlands were operated at relatively high organic loading rates (23 g COD m^?2 day^?1) for 4 months to evaluate their relative ability to remove either dissolved organic carbon (glucose, considered to be a readily biodegradable substrate) or particulate organic carbon (starch, considered to be a slowly biodegradable substrate). The systems were built using plastic containers (0.93 m long, 0.59 m wide and 0.52 m high) that were filled with an 0.35 m layer of wetted gravel (D₆₀?=?3.5 mm, uniformity coefficient C_u?=?D₆₀/D₁₀?=?1.7) and the water level was maintained at 0.05 m under the gravel surface to give a water depth of 0.30 m. The results indicated that there was no significant difference in COD removal between the two systems. Both systems generally had COD removal rates of over 90%, which is quite high if the heavy load applied is taken into account. The removal of ammonium was greater in the glucose-fed system (57%) in comparison with the starch-fed system (43%). Based on mass balance calculations and stoichiometric relationships, it was estimated that denitrification and sulphate reduction were minor pathways for the removal of organic matter. Indirect observations allowed to assume that methanogenesis made a highly significant contribution to the removal of organic matter.     

Ammonia Removal from Oil Refinery Effluent in Vertical Upflow Macrophyte Column Systems

Constructed vertical macrophyte systems, for nitrogen removal from oil refinery wastewater, were investigated. Detailed studies were carried out in laboratory columns (diameter, 0.06 m; depth, 0.5 m; operating volume, 0.6 L) planted with common reed, Phragmites australis. Through a vertical flow format, collected oil refinery wastewater was supplied directly to the columns. Wastewater quality varied through the experimental period with initial ammonia concentrations ranging from 3 to 20 mg N L^-1. Effective ammonia removal was obtained for the planted columns with a hydraulic detention time of 5 hr. Removal efficiencies above 90% was obtained for high (above 6 mg N L^-1) ammonia inflow concentrations. A satisfactory ammonia removal was obtained at shorter detention times for the low initial concentrations. Longer detention times also provided organic nitrogen removal. Recirculation of the flow, which provides the same total detention time but a higher hydraulic loading, provides the possibility to adjust the flow rate and the inflow ammonia concentration with detention time to achieve a target outflow concentration.     

Mineral nitrogen dynamics in poorly drained blanket peat

Summary Mineral-N dynamics have been measured over a period of 3 years in PK- and NPK-treated plots (4 m²) laid out on an area of poorly drained, reseeded, blanket peat in the north of Scotland. Mineral-N, present in the peat almost entirely as NH _in4 ^sup+ , accumulated in winter, reaching 42 kg N ha^–1 in the surface 10 cm in April before the application of 112.5 kg N ha^–1 as NH₄NO₃ or urea. In situ incubation of peat cores isolated to prevent leaching, and with grass tops removed, confirmed that net mineralization occurred between November and April, with the greatest rate, 1.2 kg N ha^–1 day^–1, recorded between March and April. During the period May to early June, immobilization of N predominated and rates of net immobilization ranged between 0.2 and 0.8 kg N ha^–1 day^–1. This coincided with a poor uptake into herbage, less than 16% of soil mineral N and fertilizer NH₄NO₃ in June of the first 2 years. The largest counts (most probable number) of ammonifying bacteria in the surface 5 cm were recorded in July for aerobes (27.1×10⁹ litre^–1) and August for anaerorbes (7.1×10⁹ litre^–1). N fertilizer increased these counts significantly (P<0.05) to 56×10⁹ aerobes and 13×10⁹ anaerobes. During July and August, in 2 out of the 3 years, mineralization predominated over immobilization and mean net rates of up to 0.9 kg N ha^–1 were recorded.     

Removal of Heavy Metals from Soils using Enhanced Electrokinetic Soil Processing

In order to remediate contaminated land, a new process of electrokinetic purging of heavy metals from saturated soil is examined by laboratory experiments. Electrokinetic soil remediation is one of the most promising soil decontamination processes as it has high removal efficiency and time-effectiveness in low permeability soils such as clay. Being combined with several mechanisms-electromigration, electroosmosis, diffusion and electrolysis of water, electrokinetic soil processing can remove non-polar organics as well as ionic contaminants. This study suggests that the removal efficiencies for Pb and Cd are significantly influencedby applied voltage and current, type of purging solutions, soilpH, permeability and zeta potential of soil. The removal efficiencies for Pb and Cd were 75–85% for the kaolinite soil and 50–70% for the tailing soil over the duration of 4 days. For heavy metals, their adsorption capacities on the soil surface and mobilities in soil have significant effects on the removal efficiency.     

对虾高位池循环水养殖系统对水质调控效果研究

为了改善高位池对虾养殖水质,降低养殖环境污染,提高产品质量安全,对自主研发的高位池循环水养殖系统调控对虾养殖水质的效果进行研究,设计了3个不同循环量（20m·3h-1,T1）、（40m3·h-1,T2）、（60m3·h-1,T3）水处理系统进行高位池试验。结果表明,不同处理量的循环水系统均能有效地降低水体中NH4＋和NO2-,T1、T2、T3对NH4＋的相对消除率分别为46%、56%、57%;对NO2-的相对消除率分别为38%、34%、54%;各处理组对NO3-均没有明显的消除作用。T1、T2对PO34-无消除效果,T3对PO34-的相对消除率为36%。T1对COD无消除效果,T2、T3对COD的相对消除率为9%、15%。综合比较可知,60m·3h-1循环水处理系统对改善水质效果最好,40m3·h-1次之,20m3·h-1最差。     

Evaluation of denitrification losses by the acetylene inhibition technique in a permanent ryegrass field (Lolium perenne L.) fertilized with animal slurry or ammonium nitrate

In a field experiment, the effect of animal slurry, (with and without the nitrification inhibitor dicyandiamide on total denitrification losses estimated by the C₂H₂ inhibition technique was measured over 2 years (1989–1990). During this period, four different plots (each with four replicates) were fertilized six times with 150 kg N ha^-1 in the form of cattle-pig slurry or NH₄NO₃. Soil samples (0–20 cm) were analysed at regular intervals for NH _inf4 ^sup+ and NO _inf3 ^sup– concentrations. The soil water content was determined gravimetrically. During the first year (1989) total denitrification losses from unfertilized, mineral-fertilized, and animal slurry-amended plots (with or without dicyandiamide) were estimated as 0.2, 3.1, 0.7, and 0.6 kg N ha^-1, respectively. During the second year (1990) the denitrification losses were 0.4, 1.3, 0.7, and 0.7 kg N ha^-1, respectively. There was a clear relationship between the NO _inf3 ^sup– concentration or soil water content and the denitrification rate. The results are siteund experiment-specific and cannot be generalized so far.     

寒冷地区多级垂直流人工湿地系统设计及氮磷去除效率

为了解决北方寒冷地区人工湿地冬季效率低、运行不稳定的问题,设计建设了两个多级垂直流人工湿地系统(multistage vertical-flow constructed wetlands,MVCWs),处理北京房山区居民生活污水,通过工程设计以及添加碳源强化系统脱氮效果,增加磷吸附基质等措施,提高系统稳定性和污染物的去除效率。研究结果表明,湿地系统Ⅰ化学需氧量(chemical oxygen demand,COD)的平均去除率为87.3%;总磷(total phosphorus,TP)的平均去除率为91.9%;总氮(total nitrogen,TN)的平均去除率为68.9%,能够全年稳定运行。湿地系统Ⅱ采取半间歇式运行方式,在0.5 m3/(m2·d)的水力负荷条件下,对COD、TN、TP的平均去除率分别为92.5%、53.8%、77.2%。湿地系统Ⅱ厌氧单元添加62 kg木块后,COD/TN从0.93上升到1.85,比添加31 kg木块单元对TN的去除率提高15.6%。木块作为厌氧阶段的外加碳源,有效促进了垂直流人工湿地系统对氮的去除。通过垂直流人工湿地多级合理的单元设计,在厌氧阶段添加碳源有利于反硝化脱氮以及添加吸附磷的基质,提高冬季没有植物参与时高效除氮、磷,有效地保证对各种污染物的去除效率。使该研究中的人工湿地系统能够全年稳定运行,该研究结果可为人工湿地在中国北方的推广应用提供参考。     

Chemical Oxygen Demand and Ammonia Nitrogen Removal in a Non-saturated Layer of a Strengthened Constructed Rapid Infiltration System

A strengthened constructed rapid infiltration (SCRI) system is a sewage treatment system derived from a constructed rapid infiltration (CRI) system. The SCRI tank structure primarily includes saturated and non-saturated layers. The degradation of the chemical oxygen demand (COD) and the conversion of ammonia nitrogen (NH₄ ⁺-N) are primarily performed in a non-saturated layer. To study the COD and NH₄ ⁺-N removal process in a non-saturated layer, two organic glass columns with a radius of 2.5 cm and a height of 70 cm were loaded with layers of soil from the Shunyi district of Beijing. The primary goal of this research is to quantify the removal effect factors and the relationship of the COD and NH₄ ⁺-N in the non-saturated layer. The SCRI system functioned successfully under a wetting-drying ratio of 1:5 with hydraulic loading at 1.0 m³/ (m²·d) for over 2 months. Our results show that the removal rate of NH₄ ⁺-N is approximately 69.11%, and the removal efficiency of COD is approximately 90.46%. The removal of COD is only slightly affected by pH, while the removal of NH₄ ⁺-N is greatly influenced by pH.     

人工快速渗滤法处理干旱区小城镇污水的试验研究

人工快速渗滤法作为一种处理效率较高、处理成本较低、运行维护技术要求低的分散式污水处理技术,比较符合小城镇污水处理需求。针对西北干旱区小城镇水环境污染日益严重,利用模拟系统研究了不同填料比和不同湿干比对人工快速渗滤系统处理小城镇污水时COD、总磷、凯氏氮和铵氮去除效果的影响。结果表明,土砂比2∶1的系统污染物去除效果优于其他填料比,对COD、总磷、凯氏氮和铵氮的去除率分别为35.05%～65.07%、53.27%～70.38%、10.42%～49.65%和11.61%～50.27%。COD、凯氏氮和铵氮的去除率在湿干比1∶1时最高,分别为27.86%～65.07%、49.65%～53.18%和50.27%～57.14%。在湿干比1∶5时,总磷的最高去除率为45.37%～69.15%。     

Tertiary treatment of the liquid fraction of pig manure with Phragmites australis

Since 2003, the pig industry in Flanders (Belgium) is obliged to process a portion of the nutrient overproduction. In general, pig manure processing occurs as follows: i) separation into liquid and solid fractions, ii) conversion of the solid fraction to an exportable product (e.g. composting) and iii) reduction of nutrient contents in the liquid fraction before discharge into surface water or spreading on arable land. The aim of this study was to evaluate the potential of constructed wetlands (CWs) planted with Phragmites australis to reduce nitrogen (N), phosphorus (P) and chemical oxygen demand (COD) in the liquid fraction to levels below discharge criteria. In addition, the removal efficiency of heavy metals (Cu, Zn) present at elevated levels in the liquid fraction was evaluated. A greenhouse experiment was conducted with subsurface flow (SSF) reed beds (2 × 0.125 × 0.11 m) filled with sand, loam, clayey sand or expanded clay (argex). The liquid manure load was set at 1 mm per day. Removal efficiencies varied between 64–75% for COD, 73–83% for N and 71–92% for P, depending on the matrix material used. However, effluent levels still remained significantly above the Flemish legal discharge criteria of 2 mgl^?1, 15 mgl^?1 and 125 mgl^?1 for P, N and COD respectively.     

Soil water conservation and yield of winter sorghum (Sorghum bicolor L. Moench) as influenced by tillage, organic materials and nitrogen fertilizer in semi-arid tropical India

Soil water and nutrients play an important role in increasing sorghum (Sorghum bicolor L. Moench) yields in the Vertisols of semi-arid tropics during post-rainy season. The effects of tillage practices, organic materials and nitrogen fertilizer on soil properties, water conservation and yield of sorghum were evaluated during winter seasons of 1994–1995 and 1995–1996 on deep Vertisols at Bijapur in the semi-arid tropics of Karnataka State (Zone 3) of south India. Conservation and availability of water and nutrients during different stages of crop growth were increased by deeper tillage resulting in increased grain yield of winter sorghum. Medium and deep tillage increased the grain yield by 23% (1509 kg ha⁻¹) and 57% (1919 kg ha⁻¹) during 1994–1995 and 14% (1562 kg ha⁻¹) and 34% (1835 kg ha⁻¹) during 1995–1996, respectively, over shallow tillage. Water use efficiency increased from shallow (4.90 kg ha⁻¹ mm⁻¹) to deep tillage (7.30 kg ha⁻¹ mm⁻¹). Greater water use efficiency during 1994–1995 as compared to 1995–1996 was attributed to lower consumptive use of water during 1994–1995. Among organic materials, application of Leucaena loppings conserved larger amounts of water and increased winter sorghum yield and water use efficiency. Application of Leucaena loppings increased the winter sorghum grain yield by 9% (mean of 1994–1995 and 1995–1996) as compared to vermicompost. Significantly (P < 0.05) higher water use efficiency of 6.32 kg ha⁻¹ mm⁻¹ was observed in Leucaena loppings incorporated plots compared to 5.72 kg ha⁻¹ mm⁻¹ from vermicompost. Grain yield increased by 245 kg ha⁻¹ with application of 25 kg N ha⁻¹ in 1994–1995, and a further increase in N application to 50 kg ha⁻¹ increased the grain yield by about 349 kg ha⁻¹ in 1995–1996. Deep tillage with application of 25 kg N ha⁻¹ resulted in significantly higher sorghum yield (2047 kg ha⁻¹) than control during 1994–1995. Deep tillage with integrated nutrient management (organic and inorganic N sources) conserved higher amount of soil water and resulted in increased sorghum yields especially during drought years.     

新型分层生物滴滤池去除污水中氮磷的性能研究

生物滴滤池是农村生活污水处理的主要技术之一,但其存在氮、磷去除能力有限,稳定性不高等缺点。为提高新型分层生物滴滤池的氮磷去除效率,探索最佳工艺条件,本文采用新型分层生物滴滤池为试验装置,考察了滤料种类、水力负荷、回流比等对装置去除污水中氮磷性能的影响。结果表明,当滤料为炉渣、水力负荷为4 m3·m-2·d-1、回流比为2∶1时滤池去除氮磷的效果最好,对NH4+-N、TN、TP、COD的平均去除率分别可达到87.08%、57.37%、66.04%、80.78%;采用较高的回流比是滴滤池提高脱氮效果的一条有效途径。