生物流化床法处理城市污水处理厂污泥回流液的可行性研究

以城市污水处理厂污泥回流液为研究对象,研究生物流化床法降低污泥回流液中氮磷浓度的效果,并分析了COD/TN与COD/TP值对生物流化床脱氮除磷的影响.结果表明,COD_(Cr)浓度对脱氮影响不大,而对除磷有较大影响.在COD_(Cr)为500 mg/L,进水TN为115 mg/L时,TN的去除率最大为72.05%,此时,COD/TN值为4.35.在COD_(Cr)为480 mg/L,进水TP为11.25 mg/L时,TP的去除率最高为36.98%,此时COD/TP为42.67.生物流化床法对降低高浓度氮磷污泥回流液具有一定的去除效果,TN去除率可达56.35%,TP去除率为28.96%.     

双污泥回流A~2/O工艺在低温下的脱氮除磷效果

在温度为9~16℃的低温条件下,考察了双污泥回流A2/O工艺系统处理低C/N城市污水的脱氮除磷特性。试验结果表明:在低温处理低C/N城市污水时,将A2/O工艺改良为双污泥回流系统,通过富集反硝化除磷菌(DPB)和强化缺氧吸磷等方法,取得了良好的同步脱氮除磷效果。当水温为12~16℃,缺氧池DO为0.2~0.4mg/L时,进水TN、NH3—N和TP平均分别为47.44mg/L、37.50mg/L和6.01mg/L时,系统出水TN、NH3—N和TP平均分别为12.81mg/L、2.75mg/L和0.37mg/L,去除率分别为72.99%、92.66%和93.90%,当水温为9~12℃时,系统对TN、NH3—N和TP去除效果下降,不能达到预定的去除目标。系统对COD去除效果良好,进水COD平均为253.59mg/L,出水为26.85mg/L,平均去除率为89.41%。     

强化微电解-水解酸化-SBR处理造纸废水的效果

研究采用混凝、强化微电解、水解酸化和SBR组合技术处理造纸废水的效果。结果表明,废水经混凝处理、H_2O_2/MnO_2/微电解处理后,废水COD、SS、NH3-N、TP、BOD的去除率分别为88.23%、98.47%、86.78%、98.68%和82.56%,废水的可生化性由0.32提高到0.42;经水解酸化和SBR处理后,出水中COD平均质量浓度为85 mg/L,SS质量浓度为0 mg/L,NH3-N平均质量浓度为1.42 mg/L,TP平均质量浓度为0.1 mg/L,BOD平均质量浓度为30 mg/L。工程连续运行15d,进水中COD平均质量浓度为5 865 mg/L,出水中COD平均质量浓度为85 mg/L,COD总去除率为98.55%,出水达到废水一级排放要求。     

气浮-微电解-两级AO-MBR-混凝处理果仁类食品废水的工程实例

针对某果仁食品废水果胶含量大、色度高、有机物浓度高等特点,设计采用曝气调节-气浮-铁碳微电解-混凝-两级AO-MBR-混凝沉淀组合工艺进行处理,介绍了该组合工艺的流程、主要设计参数及处理效果。进水COD、TN、TP的浓度分别为3 468、59.13、13.23 mg/L。废水经过该组合工艺处理后,COD、TN、TP的去除率可达到99.45%、93.40%、99.70%,出水水质优于《广东省水污染排放限值》(DB 44/26-2001)第二时段一级排放标准。     

某化工园区污水处理厂提标改造工艺设计

江苏某化工园区污水处理厂一期工程规模为7500 m3/d,进水COD、BOD5、SS、NH3-N、TN、TP平均浓度分别为455 mg/L、70 mg/L、265 mg/L、33.1 mg/L、41.3 mg/L、3.4 mg/L.原工艺出水中除了TN及SS浓度仅能达到《城镇污水处理厂污染物排放标准》(GB 18918...     

一体式连续流A/O-MBR脱氮除磷试验研究

采用一体式厌氧/好氧膜生物反应器(A/O-MBR)处理模拟生活污水,溶解氧(DO)浓度分别控制在小于0.7mg/L,1±0.3mg/L,2±0.3mg/L和大于0.3mg/L下,以DO为2±0.3mg/L时,反应器对污染物的去除能力最强,COD、NH4+-N、TN、PO43--P的去除率分别可达91.4%,89.6%,88.7%和92.3%。在该DO条件下,对C/N和C/P对污染物去除效果的影响进行了研究。结果表明:当进水C/N在14～24之间C/P在70～120之间变化时,氨氮及总氮去除率随着C/N的增大而增大,而对COD及磷的影响不大。当进水C/N=8,C/P=40时,脱氮效果明显下降。说明即使控制适宜的溶解氧,在碳源不足的情况下对氮也无法达到较好的去除,表明碳源是否充足是影响同步硝化反硝化的关键因素。     

SBR和MAP法综合处理磷酸盐工业废水和垃圾渗滤液研究

氨氮浓度为2 677.34 mg/L的垃圾渗滤液和磷酸盐浓度为1 804.48 mg/L的磷酸盐工业废水经磷酸铵镁沉淀法综合处理后的混合废水TP为8.36 mg/L,TN为78.69 mg/L,电导率为29 600μS/cm。探讨了用SBR进一步处理混合废水的可行性。用常规的活性污泥,通过逐步提高废水的含盐量,驯化出了在较高含盐量下仍具有较好活性的活性污泥。试验结果表明,当混合废水和生活污水以1:1混合后,TN约为51 mg/L、TP约为6 mg/LCOD_(Cr)约为630 mg/L。在电导率为15 000μS/cm,运行周期为10 h(其中厌氧1.5 h、好氧4.5 h、缺氧2.5 h、后好氧0.5 h、沉淀排水和闲置1 h)的条件下,出水TN<15 mg/L、TP<1 mg/L、COD_(Cr)约为50 mg/L,TN、TP、COD_(Cr)去除率分别在77%、87%、92%以上。     

ABR—AB组合工艺处理屠宰废水工程实践

某屠宰厂屠宰废水COD高达3 000mg/L,NH3—N高达400mg/L,选用ABR—AB组合工艺进行处理,在进水COD为2 278mg/L,NH3—N为400mg/L情况下,ABR工艺段出水COD为495mg/L,去除率为78.27%,AB工艺段出水COD为88mg/L,去除率为82.22%,NH3—N为8.27mg/L,去除率97.95%,该系统具有运行稳定,处理效果好的特点,出水水质最终能够达到《肉类加工工业水污染物排放标准》(GB 13457—92)一级标准。     

电凝聚对厨房废水处理的试验研究

采用电凝聚对厨房废水进行处理。通过改变电流密度、电解时间、沉淀时间等条件 ,进行了对废水中的COD ,浊度 ,NH3-N ,油 ,TP去除率的试验研究。当COD为 2 2 6 4mg/L ,油 15 5 4mg/L ,浊度 330 3NTU ,NH3-N 4 5mg/L ,TP 2 1 36mg/L时 ,在电流密度 2 0A/m2 ,沉淀时间 15min ,电解时间 10min的条件下 ,COD和氨氮去除率接近 70 % ,油的去除率达 90 %以上 ;对TP和浊度也有较好的去除效果     

A(缺氧活性污泥)/B(A/O淹没式生物膜)复合系统处理垃圾填埋场渗沥液

本文采用A(缺氧活性污泥)/B(A/O淹没式生物膜)复合系统处理垃圾填理场渗沥液.结果表明,对于COD=1693.9mg/L、NH_4~+-N=170.0mg/L和TN=190.0mg/L的填埋场渗沥液,经该复合系统处理后,出水COD、NH_4~+-N和TN分别降至97.9mg/L、8.3mg/L和49.5mg/L,相应的去除率分别为94.2%、95.1%、73.9%,达到良好的去除有机物和脱氮效果.同时发现渗沥液在填埋场渗沥液贮存池中经历了一定程度的厌氧降解过程,使COD达到50%的去除率.     

Treatment of slaughterhouse plant wastewater by using a membrane bioreactor

The use of a membrane bioreactor (MBR) for removal of organic substances and nutrients from slaughterhouse plant wastewater was investigated. The chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) concentrations of slaughterhouse wastewater were found to be approximately 571 mg O2/L, 102.5 mg/L, and 16.25 mg PO4-P/L, respectively. A submerged type membrane was used in the bioreactor. The removal efficiencies for COD, total organic carbon (TOC), TP and TN were found to be 97, 96, 65, 44% respectively. The COD value of wastewater was decreased to 16 mg/L (COD discharge standard for slaughterhouse plant wastewaters is 160 mg/L). TOC was decreased to 9 mg/L (TOC discharge standard for slaughterhouse plant wastewaters is 20 mg/L). Ammonium, and nitrate nitrogen concentrations of treated effluent were 0.100 mg NH4-N/L, and 80.521 mg NO3-N/L, respectively. Slaughterhouse wastewater was successfully treated with the MBR process.     

Enhanced removal of chemical oxygen demand, nitrogen and phosphorus using the ameliorative anoxic/anaerobic/oxic process and micro-electrolysis

Synthetic wastewater was treated using a novel system integrating the reversed anoxic/anaerobic/oxic (RAAO) process, a micro-electrolysis (ME) bed and complex biological media. The system showed superior chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal rates. Performance of the system was optimised by considering the influences of three major controlling factors, namely, hydraulic retention time (HRT), organic loading rate (OLR) and mixed liquor recirculation (MLR). TP removal efficiencies were 69, 87, 87 and 83% under the HRTs of 4, 8, 12 and 16 h. In contrast, HRT had negligible effects on the COD and TN removal efficiencies. COD, TN and TP removal efficiencies from synthetic wastewater were 95, 63 and 87%, respectively, at an OLR of 1.9 g/(L·d). The concentrations of COD, TN and TP in the effluent were less than 50, 15 and 1 mg/L, respectively, at the controlled MLR range of 75-100%. In this system, organics, TN and TP were primarily removed from anoxic tank regardless of the operational conditions.     

沼液预处理最优混凝搅拌条件的研究

通过混凝法对沼液进行预处理最优条件的研究,为沼液预处理提供参考。在实验室条件下,对COD、TN、TP、色度和SS的去除率综合评价混凝工艺效果。实验中依次进行混凝剂投加量、助凝剂投加量、pH和搅拌强度的单因素实验,进而通过正交实验确定沼液预处理最优的混凝搅拌条件。试验结果表明:PAC投加量为4 g/L、PAM投加量为50 mg/L、搅拌速度为200 r/min、混凝阶段同时投加PAC和PAM,处理后的水样COD、TN、TP、色度和SS分别为216.20、181.99、0.18、11.77和71.67 mg/L,去除率分别达到92.51%、88.85%、99.75%、98.37%和89.46%,达到畜禽养殖业污染物排放标准(GB18596-2001),减轻了后续污水处理的负荷,为沼液实际处理提供了理论支持。     

DO对短程同步硝化反硝化除磷工艺的影响

针对碳源偏低的城市污水,采用序批式活性污泥法研究D0对短程同步硝化反硝化除磷工艺的影响,同时对短程同步硝化反硝化和反硝化除磷的机理进行探讨。试验表明：控制DO浓度可在同一个反应器内既实现短程同步硝化反硝化反应又达到反硝化除磷的效果。综合考虑COD、NHg—N、TN、TP的出水浓度达到一级A排放标准,得出最佳的D0控制范围。当D0浓度在0．5～1．0mg／LU时．COD的去除率达到93％～94％,Nil,＋一N的去除率为97％～98％,TN的去除率达到85％一96％,TP的去除率为91％～93％。     

BICT biological process for nitrogen and phosphorus removal.

An updated biological nitrogen and phosphorus removal process--BICT (Bi-Cyclic Two-Phase) biological process--is proposed and investigated. It is aimed to provide a process configuration and operation mode that has facility and good potential for optimizing operation conditions, especially for enhancing the stability and reliability of the biological nutrient removal process. The proposed system consists of an attached-growth reactor for growing autotrophic nitrifying bacteria, a set of suspended-growth sequencing batch reactors for growing heterotrophic organisms, an anaerobic biological selector and a clarifier. In this paper, the fundamental concept and operation principles of BICT process are described, and the overall performances, major operation parameters and the factors influencing COD, nitrogen and phosphorus removal in the process are also discussed based on the results of extensive laboratory experiments. According to the experimental results with municipal sewage and synthetic wastewater, the process has strong and stable capability for COD removal. Under well controlled conditions, the removal rate of TN can reach over 80% and TP over 90% respectively, and the effluent concentrations of TN and TP can be controlled below 15 mg/L and 1.0 mg/L respectively for municipal wastewater. The improved phosphorus removal has been reached at short SRT, and the recycling flow rate of supernatant between the main reactors and attached-growth reactor is one of the key factors controlling the effect of nitrogen removal.     

移动式污水处理系统应用于分散生活污水的试验研究

针对分散型生活污水量小面广的特点,开发出移动式污水处理系统,系统由生化预处理池和车载式移动污水处理设备组成.中试结果表明,采用该组合工艺,出水CODCr＜40 mg/L,BOD5＜10 mg/L,TP＜0.5 mg/L,TN＜10 mg/L,NH3-N＜1 mg/L,其平均去除率分别达到86.69%,94.89%,89.40%,74.35%和97.89%.出水指标均能达到＜城镇污水处理厂污染物排放标准＞(GB 18918-2002)一级A排放标准.     

生物滤池串联工艺处理西洋河淀粉废水

为减少西洋河淀粉废水中大量N、P、CODCr进入洋河水库,加剧水库的富营养化,进行了 生物滤池串联工艺处理西洋河淀粉废水的研究。结果表明:系统对淀粉废水中的氨氮、总氮、总磷、 可溶性总磷、正磷酸盐、CODCr均具有较好的去除效果,去除率可分别达到57．7％、58．7％、66．8％、 65．7％、67．4％、75．2％,且对进水浓度变化具有一定的适应性。     

恒液位SBR工艺处理城市污水的研究

采用恒液位SBR工艺对城市污水处理进行实验研究。研究影响恒液位SBR工艺脱氮除磷效果的缺氧-好氧循环、沉淀时间、进水流量等因素。结果表明:在最佳工况下处理城市污水时,COD、TN、TP和NH3-N去除率分别为88.21%~91.04%、68.04%~70.45%、95.26%~96.11%和89.76%~91.17%,说明采用恒液位SBR工艺处理城市污水是可行的。     

改良型人工快渗系统脱氮除磷效果研究

人工快渗(CRI)系统是一种广为人知的无动力生态处理技术措施,但传统CRI系统存在对氮、磷去除率普遍较低的问题。本研究采用海绵铁、沸石、火山岩、红壤土和杂沙作为填料,构建了一个改良型CRI系统,在水力负荷为1 m~3/(m~3·d)的条件下,以实际生活污水为试验进水,进行为期20天的试验。实验结果表明,该系统在运行16天后出水TP、TN和NH_3-N浓度均趋于稳定,稳定后出水平均浓度分别为0.21 mg/L、8.38 mg/L和2.34 mg/L,能分别满足《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A排放标准的0.5 mg/L、15 mg/L和5 mg/L的限值。TP、TN和NH3-N三项指标的总平均去除率为84.44%,远高于传统CRI系统的44.06%总平均去除率。该研究成果为治理农村生活污水提供了一项行之有效的生态治理技术措施。     

改进型合并净化槽处理生活污水的影响因素

通过设置改性复合填料和微电解铁屑床对合并净化槽进行工艺改进,采用厌氧(缺氧)好氧(A2/O)工艺处理生活污水。为优化该装置处理生活污水的效果,分别选取水力停留时间、有机负荷、污泥回流比作为运行条件进行试验室中试研究。结合试验结果和经济效益,得出最佳运行条件:水体停留时间为8 h,此时系统对COD、TN和TP的去除率分别为95%、63%8、7%;COD有机负荷为2.7 g/(L.d),该条件下出水COD、TN和TP平均去除率分别可达到90%、74%、88%;污泥回流比为75%,此时净化槽出水COD、TN和TP平均去除率分别达到95%、70%、94%。