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二级
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  second grade
    The experimental results demonstrate that the optimal HRT of SBR was 6 h,and the optimal reaction time of SBR was 4 h of hydrolysis acidification-SBR system at the CODcr of influent was 1 250~1 830 mg/L and eduction ratio of SBR was 1∶2,the effluent water was conform to the second grade of the national standard for wastewater discharge(GB 8978—1996).
    试验结果表明,当进水CODcr质量浓度为1 250-1 830 mg/L,水解酸化池的最佳水力停留时间为6 h,SBR在排出比为1∶2,最佳的反应时间为4 h,出水可以达到国家污水综合排放标准(GB 8978—1996)二级排放标准.
短句来源
    In the total phosphorus, the first and second grade has occupied 38.00%, the third and fourth are 36.00% and others are 26.00%.
    土壤全磷一级和二级水平的已经占到38.00%,三级四级水平的占总数的36.00%,四级以下的占26.00%;
短句来源
    And in the potent phosphorus, the first and second grade has occupied 60.00%, the third and fourth are 28.00% and the fifth and sixth are only 12.00%.
    有效磷水平一级和二级已经占到60.00%,三级四级占到28%,五级和六级含量只占12%。
短句来源
    The concentration of Cr~(3+) in outgoing waste water is accord with "Integrated wastewater discharge standard"(GB8978-1996), the concentration of NH_3-N in outgoing waste water is accord with the second grade standard of effluent, the concentration of COD in outgoing waste water is accord with "sewage in sewer discharge standard "(CJ3082-1999).
    出水Cr~(3+)浓度达到《污水综合排放标准》(GB8978-1996),氨氮达到二级排放标准(GB18918—2002),COD达到《污水排入城市下水道水质标准》(CJ3082-1999)。
短句来源
    This technological process was shown to be feasible by a large scale test and the rate of recoverying for Zinc was 80%. It's quality is up to the second grade of state criterion. (GB1625—79)
    经扩大试验验证,工艺流程可行,锌的回收率为80%,产品质量符合国家标准(GB1625—79)规定的二级产品各项指标的要求。
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    A STUDY ON THE TREATMENT OF WASTE WATER FROM PAPER PLANT BY UAFB GRADE-TWO ANAEROBIC DIGESTION
    UAFB二级厌氧处理造纸废水的研究
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    Two Classes Assessment of Comprehensive Environmental Quality Based on B-P Neural Network
    综合环境质量的B-P网络二级评价
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    Discussion aboutSewage Treatment in Asphalt Plant after Twice Air Floating
    关于沥青厂二级气浮后污水处理的探讨
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    After treated by anaerobic process and aerobic process,alcohol effluent can meet the national discharge requirements(GB 8978-1996) in terms of BOD5 and ammonia,but its COD concentration is still higher than 600mg/L.
    酒精废水厌氧好氧生化处理后,BOD5和氨氮能达到GB 8978—1996二级排放标准,但COD仍高达600mg/L以上.
短句来源
    The average removal rate of CODCr, SS, BOD5, NH3-N, T-P have reached to 77.6%, 85.4%, 74.0%,83.0% and 79.7% respectively after treatment and the quality of the effluent were up to Grade II of the Lianyungang Wastewater pollutant Discharge Standard(DB32/180-1998).
    污水处理后出水CODCr、SS、BOD5、氨氮、磷酸盐的平均去除率分别达77.6%,85.4%,74.0%,83.0%,79.7%; 出水各项指标达到《连云港市水污染物排放标准》(DB32/180- 1998)中的二级标准。
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  second grade
Moreover, a steady solution for the generalized second grade rheologic fluid flow is also presented.
      
The mean and the maximum of soil Cd are markedly higher than the levels in second grade standard soil (LSGSS) in China, and the maximum of soil Cu is close to the LSGSS in China in 2004 and is more than the LSGSS in China in 1990.
      
Method: A definition of selective mutism (according to the DSM- III-R) was sent to all second grade teachers in the study area, asking them if there were any children with these symptoms in their class.
      
They were first surveyed in second grade (N = 1284) and followed up in sixth grade (N = 906).
      
Use of 1978-1986 geophysical survey data in this method applied to the South China Sea yieled three first grade tectonic elements and nine second grade ones, in six of which subsecond grade elements were found.
      
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A mathematical model for evaluating and setting air quality standards from the point of view of technique and economics has been developed. Its kernel is a kind of mathematical programmings and called "discrete programming". A direct solution for this programming is developed, and its computer program is also compiled.

本文从研究大气质量与改善大气环境的技术措施及经济投资三者之间的关系着手,建立一套数学模型为大气标准的评定提供一个实用的工具。并将此理论模型应用于北京市SO_2年平均浓度二级标准的评定工作,得出以0.08mg/m~3为宜的结论。 本文所提出的数学方法对其他环境要素的质量标准的评定及某些技术经济问题也有一定的参考意义。

A kind of mixed bacterial culture able to treat thiocyanate-containing wastewater, was isolated from sludge.

从污泥中分离到能去除硫氰酸钠的混合菌SAT13,它是由自养菌和异养菌所组成,其中包含:排硫杆菌(Thiobacillus thioparus)、中间硫杆菌(Thiobacillusintermedius)、节细菌(Arthrobacter sp.)假单胞杆菌(Pseudomonas sp.)和固氮菌(Azotobacter sp.)。该混合菌降解NaSCN的能力较高,还具有降解丙烯腈、异丙醇、丙酮等有机污染物的能力。应用该混合菌在二级浸没式滤池上接种挂膜,处理含NaSCN的腈纶废水,形成的生物膜氧化NaSCN活性高。经十个月的中型试验,水力负荷保持在9.615m~3/m~3/day,CODcr负荷为3.12kg/m~3/day,BOD_5负荷为1.91kg/m~3/day,则CODcr平均去除率可达81.56%,BOD_5平均去除率为82.63%,NaSCN平均去除率为95.76%,出水含量小于2mg/l,其他污染物的净化效果也是令人满意的,出水水质达到排放标准。

This paper is written on investigation of redox reaction kinetics between Cr(Ⅵ) and ΣS2- in natural waters under ambient temperature and pH and anaerobic condition. Results obtained are summarized as follows:

本文模拟研究了地表水及土壤水介质中Cr(Ⅵ)在硫系统作用下的氧化还原反应动力学.在通常的pH及夏、秋温度和厌氧还原条件下进行动力学实验,采用了流动注射技术分析测定.初步确定了在一定的温度及pH条件下,当Cr(Ⅵ)与硫化物浓度相近时,二者之间的氧化还原反应为二级反应,其反应速率与Cr(Ⅵ)及总硫化物浓度的一次方乘积成正比.其速率常数随温度升高而增大,随pH升高却产生较为复杂的变化,总的说来,在pH5.5—7.0范围内速率常数较大.而在pH>7时反应很慢,近于停止了.当硫化物浓度远大于Cr(Ⅵ)时,二者之间的反应为准一级反应,Cr(Ⅵ)的还原速率与Cr(Ⅵ)浓度的一次方成正比,其反应速率常数随温度升高而增大,在pH5.0—7.8范围内速率常数随pH升高而逐渐减小.

 
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