排出厌氧富磷污水生物化学除磷脱氮ERP-SBR系统研究

ERP-SBR工艺采用循环污泥技术借助化学方法固定厌氧富磷污水中的磷酸盐,将排除活性污泥的传统生物除磷模式变为排除富磷污水,消除了生物除磷脱氮过程中控制污泥龄时存在的矛盾,使生物除磷脱氮系统可以在较长污泥龄条件下获得优异的同时除磷脱氮效果。试验结果表明当SRT为5O-80d、进水TN为28．6～58．3mg／L、TP=5．5～13．25mg／L时,ERP-SBR处理出水COD≤34mg／L、TN≤6．02mg／L、PO^3-4≤O．23mg／L,富磷污水化学固磷所需药剂用量为传统化学除磷法的5％,所得化学污泥含磷量为12～15％,可实现磷资源的回收。     

探讨城市污水生物处理总磷问题

对影响城市污水生物除磷系统出水总磷达标的几个主要因素作了分析探讨,认为在进水BOD5／TP值适当、厌氧区溶解氧控制得当、泥龄选择合理和硝酸盐回流干扰得以避免的情况下,生物除磷系统出水中的总磷浓度可达到污水综合排放标准中的二级标准（≤1．0mg／L）。若要达到一级标准（≤0．5mg／L）则需采取过滤或投加化学药剂等措施。     

MSBR工艺除磷——以武鸣污水处理厂为例

随着污水管网的不断完善,武鸣污水处理厂的进水TP由原1.5 mg/L增加至4.3 mg/L,需采用化学除磷的手段辅助削减TP.生物除磷方面,在不投加任何化学除磷药剂的前提下,将MLSS从5000～8000 mg/L降至3000～4000 mg/L,缩短污泥泥龄,提高生物除磷效率;化学除磷方面,通过重新比选除磷药剂及重新选取药剂投加点,确定使用PAC(食品级,Al2O3有效含量≥28％),并采用同步投加与后置投加相结合的多点投加方式,使出水TP稳定在0.5 mg/L以下.     

铁阳极-生物法城市污水除磷试验

铁是微生物生长的必要元素,污水中的铁离子对微生物活性、污染物的去除率有显著影响,同时,铁盐也是一种很好的混凝剂,可明显改善出水水质。本试验将电解和生物活性污泥法相结合,利用阳极反应产生的铁离子代替直接投加的铁盐,并与直接投加铁盐的反应器作比较。考察反应器中总铁、总磷的变化规律。试验证明,通电反应器比单纯投加铁盐的反应器除磷率高出9．8％左右,最高除磷率可达95．40％,最终出水含量低于0．5mg／L,符合国家的排放标准。     

一体化活性污泥法（Unitank）工艺同步加药除磷试验

针对一体化活性污泥法（Unitank）I艺除磷效果不稳定的问题,对比三氯化铁、硫酸铝、聚合氯化铝和复合铁铝四种药剂的同步化学除磷效果,分析了药剂投加量对出水总磷（11P）、浊度和pH的影响。通过技术经济分析可知,复合铁铝是Unitank工艺同步化学除磷最经济有效的药剂,其最佳投药量为173．3mg／L,TP去除率为80．1％,出水TP为0．37mg／L,处理成本约为0．067元／gP。     

助凝去除水中痕量磷的方法——杨艳玲，李星，彭永臻，等．CN1962476．

助凝去除水中痕量磷的方法属环境保护领域。加大混凝药剂的投量可以一定程度地提高除磷效率,但由此导致药剂费用的大幅提高。本发明在对城市水源水处理时．于投加常规混凝药剂前投加深度除磷助凝剂,该助凝剂由高锰酸钾与硫酸亚铁按等当量反应而成,现场配制,现场投加,以高锰酸钾投量计,为2-6mg／L,经快速搅拌3-5min后,仅需加入20％～40％的常规混凝剂,     

石化污水厂除磷技术研究

作者介绍了磷污染的危害及除磷技术现状,针对某污水处理厂的废水ρ(总磷)(TP)情况,在现有生物除磷工艺的基础上,开展了化学除磷研究,确定了最佳除磷药剂、最佳搅拌时间、最佳沉淀时间和确保TP达标的药剂投加量。通过化学除磷技术的研究应用可确保生化除磷效果不稳定的情况下污水厂出水TP的稳定达标。     

精确除磷加药控制系统模型在宿迁市某污水厂的应用

污水处理厂仅生物除磷无法实现出水总磷达标排放，则需要辅助化学除磷。针对在化学除磷工艺中人工过量加药的问题，研究化学除磷优化控制策略，建立精确除磷加药控制系统。构建了精确除磷加药控制算法模型，通过序批式试验可知，通过投加聚合硫酸铁浓度为30～80 mg/L，化学除磷过程中TP(Total Phosphate)去除率可实现40%～80%，进水过量投加系数为3.98(gFe/gp)。使用精确除磷加药控制系统和人工加药同期数据对比，高密池出水OP(orthophosphate)值范围控制0.21～0.26 mg/L，出水水质TP值低于0.3 mg/L，满足出水水质TP指标。平均每月除磷药剂节省25.9 t，平均每月除磷剂成本降低28%，吨水除磷剂成本节省0.011元/t。本研究中污水处理厂化学除磷控制的优化方法，可为其他污水处理厂的改造提供参考依据。     

聚氯化铝与聚氯化铁除磷效果的对比研究

以深圳某生活污水处理厂好氧出水为研究对象,对比了聚氯化铝(PAC)和聚氯化铁(PFC)的除磷效果。试验表明,PAC与PFC都具有良好的除磷效果;总磷去除率随着药剂投加量的增加而增加;当药剂投加量大于100 mg/L时,PFC对TP的去除率高于PAC,但PFC对出水pH的影响要大于PAC。     

化学药剂对城镇生活污水厂除磷技术的研究进展

分析了城镇生活污水厂化学除磷技术现状,具体介绍了硫酸铝、硫酸亚铁和三氯化铁这三种无机化学药剂以及聚合氯化铝和聚合硫酸铁这两种有机化学药剂除磷的原理和效果,总结了我国化学除磷药剂目前存在的三点问题,最后讨论了化学除磷技术研究进展,不断向提高除磷效率和降低成本两个方向共同努力。     

城市景观水系混凝除磷试验研究

通过混凝除磷试验考察了不同混凝剂对微污染的校园景观水系中痕量磷的去除效果及其影响因素,同时研究了硫酸亚铁强化混凝对水中不同形态磷的去除效果及聚丙烯酰胺的助凝作用.小试结果表明硫酸亚铁的除磷效果最好,最适投加质量浓度为8 mg/L,最佳pH为7,在投加质量浓度为2mg/L时就能将水体中各形态的磷有效去除.示范工程运行结果...     

厌氧／缺氧SBR反硝化除磷过程的研究

Removal of denitrifying phosphorus was verified in a laboratory anaerobic/anoxic sequencing batch reactor (A/A SBR). The results obtained demonstrated that the anaerobic/anoxic strategy can enrich the growth of denitrifying phosphorus removing bacteria (DPB) and take up phosphate under anoxic condition by using nitrate as the electron acceptor. The phosphorus removal efficiency was higher than 90% and the effluent phosphate concentration was lower than 1mg·L^-1 after the A/A SBR was operated in a steady-state. When the chemical oxygen demand(COD) of influent was lower than 180mg·L^-1, the more COD in the influent was, the higher efficiency of phosphorus removal could be attained under anoxic condition. However, simultaneous presence of carbon and nitrate would be detrimental to denitrifying phosphorus removal. Result of influence of sludge retention time (SRT) on denitrifying phosphorus removal suggested that the decrease of SRT caused a washout of DPB and consequently the enhanced biological phosphorus removal decreased with 8 days SRT. When the SRT was restored to 16 days, however, the efficiency of phosphorus removal was higher than 90%.     

电絮凝气浮法处理分散艳蓝E-4R废水的研究

采用电絮凝气浮法处理分散艳蓝E-4R染料废水,考察了电解时间、废水初始浓度、pH值及外加电解质氯化钠和絮凝剂等不同反应条件对废水处理效果的影响。结果表明,染料废水脱色率随着电解时间的加大而逐渐增大并随初始浓度的增大而慢慢降低;pH值在2.5~10范围内电解均可获得较高的脱色率。初始浓度为400 mg/L的染料废水,电解20 min后脱色率即达87.39%,但TOC去除率只有10.49%。投加50 mg/L氯化钠后,脱色率和TOC去除率分别达到93.61%和73.49%,TOC去除率提高60%以上。在电解的条件下投加不同絮凝剂能提高染料废水的处理效果,其处理效果从大到小依次为:硫酸铝>三氯化铝>硫酸亚铁,它们的适宜用量分别为50,100,100 mg/L。     

The removal of phosphorus from reject water in a municipal wastewater treatment plant using iron ore

BACKGROUND: Reject water (return liquor) from dewatering of anaerobically digested activated sludge in municipal wastewater treatment plants contains from 10 to 50% of the phosphorus load when being recycled to the aeration tank. Phosphorus removal from reject water could be an effective way to decrease phosphorus loads entering the aeration tank. An innovative approach involves the replacement of iron salts, which are commonly used for phosphorus removal, with ferrous ions produced by iron‐reducing bacteria from iron ore. The aim of the research was to examine the feasibility of phosphorus removal from return liquor using bioreduction of iron ore. RESULTS: Ferrous production, phosphate and organic carbon removal rates were determined as a function of different iron ore particle sizes in batch experiments. Iron‐reducing bacteria ensured the production of ferrous ions from iron ore up to concentrations of 550 mg L^?1. The ferrous production rate was linearly dependent on the calculated specific surface area of the iron ore particles. The phosphorus concentration in the reject water was reduced by 90% during bioreduction of iron ore. The phosphorus removal rate did not depend on specific surface area of iron ore particles when the particle size of iron ore was smaller than 7 mm. The organic carbon removal rate did not seem to be dependent on iron ore particle size. CONCLUSION: Removal of phosphate using iron ore can be more economical than conventional chemical precipitation of phosphate using iron salts because of the lower cost of iron ore. Copyright © 2008 Society of Chemical Industry     

城镇污水处理厂尾水深度化学除磷试验研究

以位于太湖流域的某城市污水处理厂A/O处理工艺的尾水为对象,进行了化学混凝除磷试验.结果表明,无机高分子混凝剂PFS和PAC较其他无机低分子混凝剂具有更好的除磷效果,且铁系混凝剂比铝系混凝剂除磷效果要好,PFS的除磷效果最好,PAC次之;混凝剂投加量为15 mg·L-1时,可使处理后出水TP的质量浓度＜0.5 mg·L-1,混凝剂PFS当n(Fe3+)/n(P)为1.25时除磷效果最好,是一种高效的混凝剂,投加量少、成本低;混凝剂和助凝剂联用时,非离子型PAM对PAC和三氯化铁的助凝效果较明显.降低城镇污水处理厂尾水中磷含量,化学除磷方法是一种有效、可行的选择.     

前置除磷优化及对多级缺氧一好氧工艺的影响

为强化厌氧-多级缺氧-好氧(A-MAO)工艺,满足GB 3838-2002的地表IV水体要求,本研究对FeCl3、Fe2(SO4)3和聚合硫酸铁(PFS)3种铁盐前置化学除磷对TP、COD的去除效果和产泥量进行研究,并考察了前置化学除磷与A-MAO工艺耦合投加量。结果表明,FeCl3和Fe2(SO4)3对TP和SS去除可达到地表IV水体要求,并明显好于PFS;FeCl3对COD的去除和产泥量最多;与FeCl3相比,Fe2(SO4)3具有较好的COD保存能力,且产泥量少。AMAO工艺使用Fe2(SO4)3前置化学除磷,导致TN含量不达GB 18918-2002要求,优化的化学生物除磷耦合投加量为130 mg/L。     

改进型分段进水厌氧/缺氧/好氧工艺强化营养物去除

In order to enhance phosphorus removal in traditional step-feed anoxic/oxic nitrogen removal process,a modified pilot-scale step-feed anaerobic/anoxic/oxic (SFA²/O) system was developed,which combined a reactor similar to UCT-type configuration and two-stage anoxic/oxic process.The simultaneous nitrogen and phosphorus removal capacities and the potential of denitrifying phosphorus removal,in particular,were investigated with four different feeding patterns using real municipal wastewater.The results showed that the feeding ratios(Q₁)in the first stage determined the nutrient removal performance in the SFA²/O system.The average phosphorus removal efficiency increased from 19.17% to 96.25% as Q₁ was gradually increased from run 1 to run 4,but the nitrogen removal efficiency exhibited a different tendency,which attained a maximum 73.61% in run 3 and then decreased to 59.62% in run 4.As a compromise between nitrogen and phosphorus removal,run 3 (Q₁=0.45Q_total) was identified as the optimal and stable case with the maximum anoxic phosphorus uptake rate of 1.58mg·(g MLSS)^-1·h^-1.The results of batch tests showed that ratio of the anoxic phosphate uptake capacity to the aerobic phosphate uptake capacity increased from 11.96% to 36.85% with the optimal influent feeding ratio to the system in run 3,which demonstrated that the denitrifying polyP accumulating organisms could be accumulated and contributed more to the total phosphorus removal by optimizing the inflow ratio distribution.However,the nitrate recirculation to anoxic zone and influent feeding ratios should be carefully controlled for carbon source saving.     

鸟粪石除磷工艺研究进展

介绍了国内外鸟粪石除磷工艺的研究现状、工艺控制因素及经济实用性,表明了该工艺可以在高效去除污水中磷的同时生成鸟粪石(磷酸氨镁,MAP)——一种优质肥料,同时对今后该工艺的发展前景与研究的方向提出展望。     

化学除磷工艺研究进展

化学除磷是抑制水体富营养化以及从废水中回收磷资源的有效手段。本文阐述了铁盐、铝盐和石灰3种常见化学除磷药剂的除磷机理及其影响因素,如pH值、投加量、投药点以及经济性分析;概述了前置化学辅助除磷、协同化学辅助除磷、后置化学辅助除磷以及旁路化学辅助除磷4种化学辅助生物除磷工艺的特点,最后介绍了吸附法和结晶法除磷新兴工艺,阐明了磷资源回收是未来化学除磷工艺的方向发展。