EGSB—自养脱氮技术处理高浓度淀粉废水工程实践

淀粉生产废水含有高浓度有机氮,选用调节池—中间水池—EGSB反应器—自养脱氮池—二沉池—混凝沉淀池处理工艺,在进水COD≤8 000 mg/L、TN≤400 mg/L的情况下,处理出水COD＜60 mg/L,NH3—N＜10 mg/L,去除率分别可达98.9％和96.9％以上,该系统具有运行稳定,处理效果好的特点,出水水质可达《污水综合排放标准》(GB 8978-1996)一级排放标准,产生的沼气可作辅助燃料加热废水,具有良好的环境效益和经济效益.     

IOC-SBBR-人工湿地组合工艺在猪场废水处理中的应用

采用内外循环厌氧反应器( IOC)-序批式生物膜反应器(SBBR)-人工湿地组合工艺处理猪场废水,工程规模为100 m3/d,投资98.8万元,运行费用约为1.11元/m3.通过向厌氧消化液添加30％原水,SBBR脱氮除磷能力明显提高;同时利用人工湿地进行深度脱氮除磷.经过一年的调试运行,工艺对CODCr 、BOD5、SS、NH3 -N、TP的去除率分别达到了96.5％、93.2％、96.2％、89％、86％,出水各项指标都达到《畜禽养殖业污染物排放标准》 (GB 18596-2001).     

MBR处理特殊废水及脱氮效果的研究进展

分析了MBR的特点及传统生物工艺处理特殊有机废水中存在的问题,总结了MBR工艺处理难降解有机废水、激素类废水和高氨氮废水的效果及MBR脱氮工艺的研究进展,进而提出MBR处理特殊有机废水和脱氮的研究方向.     

SH-A节能型生物脱氮工艺处理焦化废水工程实例

采用SH-A节能型生物脱氮工艺处理氨氮含量高、有机物可生化性差的焦化废水。工程处理水量为1600m3/d。进水CODCr约2500mg/L,NH3—N约260mg/L。处理后出水各项指标均达到了《污水综合排放标准》(GB8978—1996)一级标准,其中CODCr≤100mg/L,NH3—N≤15mg/L。     

SBBR法处理发泡剂ADC废水的试验研究

研究采用序批式生物膜反应器(SBBR)工艺处理高浓度氨氮废水-ADC发泡剂的处理效果.对试验装置、工艺进行了详细的介绍.试验表明,在温度28℃,pH值为7.4～7.8,C/N为5,氨氮容积负荷约为0.196 kg NH3-N/(m3·d)时,氨氮污泥负荷约为0.049 kgNH3-N/(kgMLSS·d),此时,NH3-N去除率达到92.75%,COD的去除率达95.4℅.     

组合式反应器处理城市污水脱氮性能研究

采用活性污泥-生物滤池组合式反应器试验装置处理城市污水,考察了活性污泥段稳定运行条件下,生物滤池段在不同DO和C/N以及提高整个反应器温度条件下脱氮的性能.研究表明,滤池段DO为1 mg/L、C/N为1.32及反应器温度为20 ℃时,反应器出水CODCr、SS、NH3-N和TN均能达到＜城镇污水处理厂污染物排放标准＞(GB 18918-2002)一级标准的B标准.     

高浓度有机废水作为焦化废水生物脱氮处理补充碳源的研究

对多种高浓度有机废水作为焦化废水生物脱氮处理补充碳源的可行性进行了研究 ,并探讨了不同种类碳源对生物脱氮反硝化速率的影响     

焦化废水生物脱氮处理开工调试

介绍了焦化废水生物脱氮处理系统开工调试中污泥培养驯化、系统稳定运行改善出水水质 ,以及影响硝化和反硝化反应的因素等几方面的体会。     

水平潜流人工湿地在含油废水三级处理中的应用

采用水平潜流人工湿地作为含油废水的三级处理工艺.试验研究了植物、季节变化对水平潜流人工湿地去除污染物性能的影响及湿地去除污染物的沿程趋势.结果表明,潜流湿地脱氮、降解有机物、去除油类性能与植物生长、季节变化密切相关,相关程度为脱氮＞去除油类＞降解有机物.潜流湿地脱氮、降解有机物、去除油类具有沿程同步性.芦苇湿地的去除污染物的性能明显好于空白湿地.     

高浓度氨氮废水脱氮效果影响因素分析

高浓度氨氮废水的任意排放会给环境带来很大危害,必须加以处理。而废水中氨、亚硝酸根、硝酸根的浓度、温度、溶解氧浓度和碱度等因素对脱氯效果都有很大影响。该文以垃圾渗滤液为对象,对脱氮的影响因素进行了分析研究。     

Application of chemical precipitation for piggery wastewater treatment.

Several series of experiments were conducted to investigate the treatment of piggery wastewater using chemical precipitation (CP) where various types of coagulants such as aluminium sulfate (Al2(SO4)3), poly aluminium chloride (PAC), ferric chloride (FeCl3), ferric sulfate (Fe2(SO4)3), ferrous sulfate (FeSO4) and ferrous chloride (FeCl2) were used. Throughout the experiments, CP was found to achieve high removal efficiencies for organic compounds and nutrients (nitrogen and phosphorus) from the piggery wastewater. Experimental results showed the optimal doses of FeCl3, Fe2(SO4)3, FeCl2 and FeSO4 was 2.0 g/L, while 0.31 g/L and 2.5 g/L were the optimum dose for PAC and Al2(SO4)3, respectively. The pH range 4-5 resulted in the best performance to all coagulants except FeCl2 and FeSO4, whose optimum pH were more than 6. Percentage removal efficiencies for COD were in the ranges of 70-80%, 90-95% for SS, 80-90% for organic-N and TP. Those removal efficiencies were achieved within 5 min of operation. Three times of repetition in CP resulted in higher removal efficiencies for COD, SS and colour up to 74%, 99% and 94% respectively, in which Al2(SO4)3 was used as the coagulant. Removal efficiencies of various water quality parameters in a continuously operated reactor were similar to those of the batch experiments. Biodegradable ratios (BOD5/COD) increased up to 65% after the application of CP.     

Modelling of biological nitrogen removal during treatment of piggery wastewater.

During this study, a mathematical model simulating piggery wastewater treatment was developed, with the objective of process optimisation. To achieve this, the effect of temperature and free ammonia concentration on the nitrification rate were experimentally studied using respirometry. The maximum growth rates obtained were higher for ammonium-oxidising biomass than for nitrite-oxidising biomass for the temperatures above 20 degrees C; values at 35 degrees C were equal to 1.9 and 1.35 day(-1), respectively. No inhibition of nitrification was observed for free ammonia concentrations up to 50 mgN/L. Using these data with others experimental data obtained from a pilot-scale reactor to treat piggery wastewater, a model based on a modified version of the ASM1 was developed and calibrated. In order to model the nitrite accumulation observed, the ASM1 model was extended with a two-step nitrification and denitrification including nitrite as intermediate. Finally, the produced model called PiWaT1 demonstrated a good fit with the experimental data. In addition to the temperature, oxygen concentration was identified as an important factor influencing the nitrite accumulation during nitrification. Even if some improvements of the model are still necessary, this model can already be used for process improvement.     

膜生物反应器处理食品废水的工程应用

介绍了MBR处理食品废水的工程效果。并在长期跟踪反应器跨膜阻力的基础上,重点探讨了膜离线和在线化学清洗的方法及结果,指出离线和在线化学清洗是控制和消除膜有机污染和无机污染的有效手段。离线化学清洗可以基本消除膜丝内表面的污染,对于膜丝外表面的污染也具有显著效果。     

蒸氨-浓缩工艺处理沉钒废水的工程应用

将经过还原、中和沉淀处理后的沉钒废水,进一步采用蒸氨-浓缩工艺处理.运行结果表明,处理后的废水氨氮浓度小于300mg/L,能够达到沉钒工艺回用水要求.通过改造,该工艺实现了废水的"零"排放和氨氮、硫酸钠的回收利用,是沉钒废水处理比较理想的工艺,在钒制品加工领域具有很好的推广前景.     

城镇污水生物脱氮达标排放工艺选择

《城镇污水处理厂污染物排放标准》(GB18918—2002)中规定了新的氮排放标准。通常污水处理厂采用生物脱氮处理工艺时,出水中氮含量远低于规定值,为此,提出了生物脱氮处理工艺出水水质恰好达标的几种工艺,以节约投资与运行费用。     

Fluorescence in situ hybridization analysis of nitrifiers in piggery wastewater treatment reactors.

Fluorescence in situ hybridization (FISH) was performed to analyze the nitrifying microbial communities in an activated sludge reactor (ASR) and a fixed biofilm reactor (FBR) for piggery wastewater treatment. Heterotrophic oxidation and nitrification were occurring simultaneously in the ASR and the COD and nitrification efficiencies depend on the loads. In the FBR nitrification efficiency also depends on ammonium load to the reactor and nitrite was accumulated when free ammonia concentration was higher than 0.2 mg NH3-N/L. FISH analysis showed that ammonia-oxidizing bacteria (NSO1225) and denitrifying bacteria (RRP1088) were less abundant than other bacteria (EUB338) in ASR. Further analysis on nitrifying bacteria in the FBR showed that Nitrosomonas species (NSM156) and Nitrospira species (NSR1156) were the dominant ammonia-oxidizing and nitrite-oxidizing bacteria, respectively, in the piggery wastewater nitrification system.     

Tertiary treatment of biologically treated piggery wastewater using vibratory shear-enhanced RO membrane.

This study presents a good example for the tertiary treatment of biologically treated piggery wastewater using vibratory shear enhanced RO membrane (VSEP RO). Through a simple process combination, utilizing Bioceramic SBR(BCS) and VSEP RO, at Gimhae plant livestock wastewater is treated excellently to meet the strict effluent standards. Application of RO membrane directly to the biologically treated effluent has been successful without any pretreatment to reduce high suspended solids. The combination of VESP UF followed by RO filtration processes produced a higher recovery rate in the 3-week pilot test.     

Phosphorus mass balance in a surface flow constructed wetland receiving piggery wastewater effluent

This research was conducted to investigate the phosphorus forms present in water, soil and sediment and to estimate the phosphorus mass balance in a surface flow constructed wetland (CW). Water quality and sediment samples were collected from each cell along the hydrologic path in the CW from October 2008 to December 2010. At the same time, three dominant plant species (e.g. common reed and cattails) were observed through the measurement of the weight, height and phosphorus content. Based on the results, the orthophosphate constituted 24-34% of total phosphorus in water for each cell. The overall average phosphorus removal efficiency of the CW was approximately 38%. The average inflow and outflow phosphorus loads during the monitoring period were 1,167 kg/yr and 408 kg/yr, respectively. The average phosphorus retention rate was 65%, was mainly contributed by the settling of TP into the bottom sediments (30%). The phosphorus uptake of plants was less than 1%. The estimated phosphorus mass balance was effective in predicting the phosphorus retention and release in the CW treating wastewater. Continuous monitoring is underway to support further assessment of the CW system and design.     

不同固态碳源用于反硝化去除污水处理厂尾水中硝态氮的研究

针对污水处理厂尾水氮素高度硝化的现状,研究了不同固体碳源在不同条件下的反硝化速率及对硝态氮的去除率。结果表明:麦秆、PBS和PHAs较其他固态碳源具有更好的脱氮效果,25℃为最适宜反应温度;进水硝态氮浓度与硝态氮去除率之间有很好的相关性;随着反应时间的延长,各碳源脱氮效率也在不断加速,至24 h时,PBS、PHAs和麦秆对应的去除率分别为98.53%、93.41%和73.26%。对三种碳源反应前后的表面进行扫描电镜分析,证实了三种碳源作为反硝化固体碳源的可行性。COD反弹和硝态氮积累试验表明,麦秆更适用于污水处理厂尾水的生态净化工艺。     

酒类废水特征及其作为反硝化碳源的可行性

研究了酒类废水作为污水处理厂反硝化碳源的可行性.首先分析了不同类型酒类废水的物化和微生物群落特征.活性污泥添加酒类废水后,反硝化速率为1.85～2.60 mgNO3-N/(gVSS.h),效果好于对照组乙酸钠(1.72).抑制性测试表明添加酒类废水对活性污泥的硝化速率、释磷和吸磷速率均无显著不利影响.残留COD测试表明添加酒类废水对出水COD的影响较小可控.碳源效率测试表明低浓度过滤酒类废水最佳,其碳源消耗质量比(△COD/△N)为7.1,低于对照组乙酸钠(10.9).综上所述,经过适当处理后的酒类废水是优质反硝化碳源.