酱油、米醋、大豆水解蛋白等废水治理方案研究

某公司主要从事酱油、米醋、大豆水解蛋白等食品的生产,根据酱油、米醋、大豆水解蛋白废水有机物浓度较高,可生化性好的特点,选择了"UASB系统 接触氧化法"二级处理工艺.UASB厌氧处理工艺去除了大部分有机物,减轻了后续接触氧化处理工艺的处理压力,达到较好的处理效果.运行结果表明,经该工艺处理后,废水中的COD、BOD5等指标均能达标排放,有利于企业的可持续发展.     

聚醚废水处理工艺研究

研究了中和混凝-厌氧十好氧-生物活性炭组合工艺,在不同工况和运行参数条件下处理聚醚废水的效果．结果表明,中和混凝能有效地降低生物处理的污泥负荷,调节pH值6．7,聚合氯化铝的投加量为l00mg/L时．聚醚废水COD去除率可达28％,当进水的COD为3000～4000mg/L时,聚醚废水经此组合工艺处理后,COD的总去除率达96％以上,出水COD值约150mg/L.     

液膜法从工业废水中提取J酸的研究

利用以LMS-2为表面活性剂,三辛胺为载体,煤油为溶剂,NaOH溶液为膜内相所组成的乳状液膜体系,从含J酸的工业废水中提取J酸。研究了各种因素对J酸提取率的影响,提出了较适宜的工艺条件。实验结果表明,该乳状液膜体系对废水中的J酸有较高的提取率。油相经破乳后多次重复使用,其提取率基本不变,J酸的提取率可达96％。     

电凝聚-二级生化-吸附工艺处理CLT酸废水

采用电凝聚－二级生化－高效吸附工艺处理CLT酸废水,经过实验室静态小试和现场扩大试验,结果表明,预处理－电凝聚可以使废水中的BOD₅/COD 比值从 0.03提高到 0.1以上;在水解酸化－好氧 SBR二级生化可靠运行基础上,利用 DGB高效吸附作用,保证废水主要污染指标色度和COD都能达标,其去除率可分别达到96.1％和98.1％以上．     

Study on membrane fouling of submerged membrane bioreactor in treating bathing wastewater

A pilot-scale submerged membrane bioreactor (MBR) was used to treat the bathing wastewater for more than 90 d. Several factors affecting membrane fouling were studied, including the variation in transmembrane pressure (TMP), changes in extracellular polymeric substance (EPS), and distribution of membrane resistance (R). The relationships between R and EPS concentration were found to be R = 0.00008(EPSS)2.915 in the mixed liquor (EPSS) and R = 0.2853(EPSm) - 0.824 on the membrane surface (EPSm). The constant...     

稀土工业酸性含氟废水处理研究

采用实验室规模的化学混凝沉淀法处理某稀土湿法冶炼厂酸性含氟废水。研究结果表明,当石灰－氯化钙－聚合氯化铝－聚丙烯酰胺联合投加,中和悬浊液中Ca2+∶F￣－≥8∶1,pH值在7～8,搅拌反应30min时,能一次性将含F￣－700～1000mg/L废水降至10mg/L以下。试验结果为该废水的达标处理报供了科学依据,并在工程设计中应用。     

高浓度有机废水二相厌氧消化过程特性研究

以填充床生物膜酸化反应器与上流式污泥床反应器（UASB）甲烷化反应器组成的二相厌氧消化装置处理高浓度啤酒废水或合成废水,最大处理能力为32～35kgCOD/d·m³。提出了二相工艺高负荷运行时最低必需酸化率的概念。进水浓度5000mgCOD/L,容积负荷30kgCOD/d·m³时,最低酸化率为28％。对主要操作参数的灵敏度分析表明,操作负荷、酸化率和进水碱度是影响COD去除率的主要操作参数。对二相厌氧消化系统中影响反应器内微生物群系的生态平衡、微生物本征活性和反应器宏观行为的主要因素进行了分类和综合讨论。     

Effect of anaerobic digestion on the high rate of nitritation, treating piggery wastewater

Laboratory reactors were operated by using piggery wastewater and the effluent of anaerobic digester from piggery wastewater plants to study the effect of anaerobic digestion on nitritation rate.     

UASB+AF处理维生素C废水的研究

采用有效容积为６ｍ３的ＵＡＳＢ＋ＡＦ反应器处理维生素Ｃ高浓度有机废水,结果表明：稳定运行容积负荷可达１０—１２ｋｇＣＯＤ／（ｍ３·ｄ）ＣＯＤ去除率大于８０％,容积产气率大于３．０Ｎｍ３／（ｍ３·ｄ）,并具有启动速度快和较强耐冲击负荷的能力。     

微氧+人工湿地组合工艺处理生活污水的试验研究

通过微氧+人工湿地组合工艺对生活污水处理效果的研究,认为该工艺是比较适合农村生活污水处理应用的工艺组合。微氧预处理对COD的平均去除率在30%以上,人工湿地水力负荷为0.2 m3/(m2.d),对COD的平均去除率在60%以上,对NH3-N的平均去除率在30%～40%,该工艺组合的运行费用为0.15～0.20元/t(污水自流进入系统情况下)。     

Vitamins,folic acid and neural tube defects: Comments on investigations in the United States

No clear answer concerning whether multivitamin/folate supplementation prevents neural tube defects (NTDs) is provided by three studies in the United States. All these studies are occurrence in nature, no recurrence studies having been conducted. The Atlanta Birth Defects Study is subject to pronounced memory and recall biases, the length between event and interview being as long as 16 years. In a second study (Boston University), objections can be raised to certain aspects of the experimental design, and the claim that 22 per cent of women started vitamins sufficiently early after pregnancy diagnosis to influence NTD formation is suspicious. Our NICHD case control study of 541 women in California and Illinois revealed no evidence for multivitamins or folic acid preventing NTDs. U.S. public policy-makers face difficulties in applying results of recurrence or occurrence studies in high-risk areas to low-risk areas in the U.S.