The treatment of wastewaters with high phosphorous and high ammonia loadings using modified bauxite refinery residues     

Malcolm W. Clark Frank Gnanam David M. McConchie Lee Fergusson 《中国地球化学学报》2006,25(B08):141-141

Bauxsol（TM） is a trade marked name for a modified bauxite refining residue where Ca and Mg are used to transform carbonate and hydroxide alkalinity from soluble to insoluble forms within the bauxite refinery residue （red mud）, This leads to a pH reduction from 〉13 to ≈8.5 and reduces soluble Al and Na contents. The concentration ratios of Ca and Mg in the treatment brine can be manipulated to provide neo-formational mineral assemblages dominated by either Mg, or Ca end members; hydrotalcite and brucite （Mg-rich）, or hydrocalumite, para-aluminohydrocalcite, aragonite and portlandite （Ca-rich）. The Bauxsol（TM） raw material （BRM） has excellent metal binding capacity （〉1500 meq/kg）, good P binding capacity （〉2% by mass） and a good acid neutralising capacity （3.5-7 M/kg）, however the BRM can be further blended with other mineral additives to enhance the geochemical properties and improve specific performance. This paper reports on the use of a high-Mg Bauxsol（TM） blend to treat waters that have high P, NH4＋ and polyacrylamide （flocculant） loadings in Biological Nutrient Reduction （BNR） plant digested sewage sludge centrates. Initial analysis of the centrate indicated it contained 325 mg/L total-P （225 mg/L P as ortho-P）, 767 mg/L N as NH4^＋, suspended solids loads （TSS） of 683 mg/L and chemical oxygen demand （COD） of 480 mg/L （although the day to day variability in nutrient loadings can be as much as 25%）. This was then treated using 1.7 g/L of a high-Mg Bauxsol （TM） blend to yield a water with 〈1.8 mg/L total-P （ortho-P is 〈0.5 mg/L）, NH4^＋ 〈460 mg/L N, 〈60 mg/L TSS, and 〈300 mg/L COD. Small additions of ferric chloride post Bauxsol （TM） addition reduced the soluble ortho-P load by about 50% and about 30% of the COD, but these additions appear largely unnecessary. Analysis of the solid residue indicates it contains 11.5% P, 0.39% N, 21% Mg, and 2.44% crude protein making the solid residue a potentially useful fertilizer. It is likely that P and NH4^＋ is affected by the formation of MgHPO4 and Mg （NH4）PO4 （Struvite） within the solids. Calculations from the solids indicate that 85% of the P removal is as MgHPO4, which appears consistent with literature on the formation geochemistry of struvite around pH 8.0. Further manipulation of the geochemistry of waters and kinetics of crystal growth may allow for a greater struvite recovery, and further enhanced ammonia removal. The treated centrate is then reported back to the head of works and solids are removed with the sludge at the primary and secondary clarifier.  相似文献   

Disposal of wastewater containing Congo Red by synthesizing layer double hydroxide in-situ     

朱荣崔康平  彭书传杨远盛陈天虎  安志环徐晓春 《中国地球化学学报》2006,25(4):390-394

Based on the principle of synthesis, a new method was put forward to dispose Congo Red anion-containing dyestuff from wastewater and its feasibility was also examined. The principle of the method is described as follows： Mg^2＋ and Al^3＋ are hydrolyzed to form Mg/Al-LDH by adding Mg^2＋, Al^3＋ and NaOH in wastewater containing anion dyestuff, which is selectively intercalated with the interlayer of LDH in order to balance positive structural charge. While Mg^2＋ and Al^3＋ are co-precipitated to form LDH, the anion dyestuff in wastewater will be removed by LDH synthesized in-situ, as is confirmed by X-ray diffraction analysis of settlings and chemical analysis of aqueous samples. In this work, we studied the influence of Mg/Al mole ratio, pH value, time and temperature of reaction on the removal of anion dyestuff and the use of Mg and Al. The experimental results showed the maximum removal efficiency of anion dyestuff could be attained when pH value was 9.0, and Mg/Al mol ratio was 2 ： 1, reaction duration was 2 hours, and the effect of temperature was not remarkable, and the removal efficiency could reach 100%. Meanwhile, the Mg and Al added could be made good use of. This technology has the advantage of extraordinary efficiency of wastewater disposal.  相似文献   

酸性矿山废水处理技术及其进展   总被引：2，自引：0，他引：2  

向武 《地质灾害与环境保护》1998,9(2):38-40

论述酸性矿山废水（ＡＭＤ）的处理方法及几种较新的ＡＭＤ处理技术。阐明酸性矿山废水的危害及传统的碱中和法和不足,指责发展新型ＡＭＤ处理技术是解决酸性矿山废水对环境危害的重要环节。  相似文献   

Development of Combined Biological Technology for Treatment of High-strength Organic Wastewater and Results of Case Studies     

REN Nanqi WANG Aijie HAN Hongjun MA Fang DING Jie SHI Yue ZHAO Dan 《中国海洋大学学报(英文版)》2006,5(4):311-316

Our study group has developed a unique combined ters from the industries of dyestuff, pharmaceutical, chemical biological technology to treat high-strength organic wastewaengineering and zymolysis by using the principles of anaerobic ecological niche and bio-phase separation. The study obtained five national invention patents and eight patent equipments. This technology contains four kernel processes - two-phase anaerobic-aerobic process, hydrolysis-acidification-oxidation process, UASBAF-oxidation process, and internal cycling-hydrolysis-oxidation process. Fifteen pilot projects were accomplished in the basins of Tai Lake, Huai River, Liao River and Songhua River, and their total capital investment reached 185.214 million Yuan （RMB）. Compared to conventional wastewater treatment technology, the innovative technology is more costeffective for high-strength organic wastewater treatment, can save capital investment by 15% - 30%, lessen land usage by 20% to 40% and decrease the operating cost by 10% to 25%. The operating cost of treatment per cubic meter industrial wastewater could be below 0.6 to 1.4 Yuan （RMB）.  相似文献   

生物流化床处理废水的研究进展   总被引：1，自引：0，他引：1  

汪德进 《地下水》2007,29(2):69-72,80

生物流化床技术是普通活性污泥法和生物膜法相结合的废水生化处理技术.通过对近年国内外生物流化床技术的研究和应用现状的分析,文中从生物流化床类型、特性入手,对生物流化床技术的应用前景进行展望.  相似文献   

SBR、PAC-SBR反应器处理制药废水污泥变化特征     

李湘凌  周元祥  周娟 《矿产与地质》2005,19(5):565-567

探讨了SBR和PAC-SBR反应器处理盐酸林可霉素原料液生产废水过程中活性污泥特征的变化.随着废水投加量的增加,PAC-SBR反应器的污泥性能始终优于SBR反应器,但是由于盐酸林可霉素原料液生产废水对生物有较强的抑制作用,PAC-SBR反应器和SBR反应器中污泥的活性均发生恶化,COD去除率已明显下降,单独采用SBR或PAC-SBR法处理已难以达到排放标准,必须进行工艺的组合.PAC-SBR反应器较SBR反应器在污泥性质及处理效率上均有一定的改善,对处理盐酸林可霉素原料药生产废水有一定的优势.  相似文献   

单斜与六方磁黄铁矿处理含Cr(VI)废水过程中pH值变化规律   总被引：11，自引：0，他引：11  

卢晓英  鲁安怀  陈洁  唐军利  姚志健 《高校地质学报》2000,6(2):271-277

与六方磁黄铁矿相比,单斜磁黄铁矿Fe缺位较普遍。在初始pH值分别为3.40～9.66和3.47～9.66较宽范围内,利用单斜磁黄铁矿和六方磁黄铁矿处理含Cr(VI) 废水,当反应达到充分平衡时,废水的pH值分别变化在3.61～4.47和5.39～6.57范围内。六方磁黄铁矿除Cr(VI)效果明显不及单斜磁黄铁矿,但被氧化的六方磁黄铁矿除Cr(VI)效率有所 提高。电化学分析表明,在酸性介质中处理的反应过程为H+的消耗过程,而在碱性介质中 则为OH 的消耗过程。根据pH值的这一变化规律,可自行调节处理过程中水质的酸性变化 ,能节省传统工艺中需要加碱以中和处理后酸性水的环节,具有一定的实际应用价值。  相似文献   

生物工程处理草浆造纸废水系统的特点   总被引：8，自引：1，他引：7  

邵忠臣  张硌  郝民杰 《地域研究与开发》2000,19(2):94-96

文章通过对许昌造纸厂废水处理系统的论述 ,介绍了以生化为主的碱法草浆造纸废水治理成套技术的概况、工艺流程、投资概算和运行成本等 ,并进一步阐明了这套技术的科学性、实用性和先进性  相似文献   

不同链长季铵盐干法球磨插层蒙脱石的研究     

蔡冬雪  廖立兵  张泽朋 《矿物学报》2012,(Z1):84

蒙脱石在化工、环境、材料等领域有着广泛的应用。有机蒙脱石因其既具有无机膨润土优良的膨胀性、吸附性和分散性,又具有疏水亲油的巨大比表面,以及与有机物很好的亲和性和相容性等优异性能,广泛应用于有机废水处理(凌辉,2011)、钻井液用成膜剂制备(苏俊霖,2011)、  相似文献   

PAC-SBR法处理松脂加工业生产废水研究     

刘杰 《南方国土资源》2005,(8):31-32

文章介绍了松脂加工业生产废水生化处理(PAC-SBR)工艺部分的主要技术参数及其对处理效果的影响。该法不仅出水效果好,工艺简单,且成本低,值得推广。  相似文献