活性污泥法净化合成树脂工业污水

本文讨论了甩脱胺和活性污泥法两段工艺处理合成树脂工业污水的工艺条件及效果,并测定了活性污泥的动力学系数,为工程设计提供了依据。     

温度对活性污泥法完全混事式工艺的影响

最近，兖州矿业（集团）公司环保安全培训中心和中国矿业大学通过实验研究温度对活性污泥法完全混合式工艺动力学参数的影响关系，为设计优化和运行管理提供了依据。     

化纤污水场开车前活性污泥的驯化

为使化纤污水处理装置与生产装置同时投入运行,需先对精对苯二甲酸（PTA）污水场的活性污泥进行驯化。我厂PTA污水场开工时活性污泥驯化选用间接培养法,以炼油污水场污泥和部分PTA污水场污泥作为接种污泥,用TA残渣配制原料,经过污泥接种、间歇进水曝气、连续进水曝气、提高负荷等阶段的驯化,达到了与生产装置同时开工的要求。     

用高浓度活性污泥法处理焦化污水

分析了普通活性污泥法硫化物降解率低的原因，进行了高浓度活性污泥法处理焦人经污水的试验和生产应用，摸索出了高浓度活笥污泥法处理含硫污水的操作指标。     

活性污泥法污水处理工艺运行总结

简要介绍了活性污泥法(CASS)污水处理工艺的原理、工艺流程及运行情况。通过实际运行证明,CASS工艺能满足氮肥企业污水处理的要求,进水COD在600mg/L左右时,出口COD可控制在150mg/L以下。     

城镇污水采用活性污泥法除磷脱氮工艺探讨

近年来,随着洗涤剂的广泛使用,废水中氮、磷的含量明显增加,引起水体富营养化加剧,因此,必须有效提高城镇污水处理厂氮和磷的去除。对多种除磷脱氮的活性污泥法,包括氧化沟工艺。A^2／O工艺、UCT工艺等,进行比较与分析,结果表明,UCT工艺比较适合除磷脱氮要求较高的污水处理厂应用。     

完全混合式活性污泥法处理生活污水试验研究

通过对处理生活污水的试验研究,确定了完全混合式活性污泥法处理生活污水的最佳曝气时间、最佳pH范围、进水COD范围以及污泥投放浓度.试验结果表明,完全混合式活性污泥法处理生活污水是一种比较理想的方法,具有占地面积少、去除率高、抗冲击负荷能力强、工艺简单等优点.     

活性污泥法污水处理厂的运行模拟

结合ASM1和二沉池模型组成活性污泥模拟系统,将某污水处理厂的常规检测数据转化为活性污泥系统模型所需的组分数据,然后调整模型参数,使污水处理厂出水指标最接近于污水处理厂实际数据,从而确定适合该污水处理厂的模型参数,最后对该污水处理厂的工艺参数进行了模拟改造。     

THE LOADS OF PAHS IN WASTEWATER AND SEWAGE SLUDGE OF MUNICIPAL TREATMENT PLANT

Abstract

Sewage and sewage sludge from a municipal wastewater treatment plant were analyzed for 16 EPA-PAHs. This plant is a classic mechanical-biological treatment plant, consisting of activated sludge technology with additional chemical treatment for the removal of phosphorus compounds. The process of sewage sludge treatment is carried out in closed as well as open sludge digesters. Primary and mechanically thickened sludge are passed through the fermentation process. Digested sludge is dewatered on filter-press through addition of flocculent. The measurements were obtained to investigate the effect of different treatment stages on PAH content in wastewater and sewage sludge. The following wastewater samples were collected: crude ones and those after sand trap, primary sedimentation, biological treatment and secondary sedimentation. Sewage sludge samples were collected from: primary sludge, digested sludge and dewatered sludge. PAH load in influent, mechanically and biologically treated sewage, as well as in raw digested and dewatered sludge, were calculated. PAHs were extracted from wastewater and sludge samples, with cyclohexane, dichloromethane using an ultrasonic method. Gas chromatograph equipped with mass spectrometry was used for qualitative and quantitative determination of PAHs. Mechanical and biological treatment proved the removal of 83–85% of PAHs from the influent. Despite this its daily PAH load introduced into the environment was high and reached 27–37% of PAH load in influent. In sewage sludge it was 46–70 g/d of PAHs (carcinogenic PAHs content 4–12%). In waste sludge (filter pressed sludge and sand from detrirer) PAH total load reached 42–68 g/d with (10–17% of carcinogenic PAHs).     

浅析CMF的影响因素与消除对策

介绍科里奥利质量流量计在甲醇、碳酸二甲酯等化工产品贸易结算中的应用,浅析影响其测量精度的主要因素以及消除影响的对策。     

合成氨装置工艺流程与联锁优化

介绍合成氨装置在天然气供应受限和装置检修等原因造成部分工段停车的情况下,利用各工段之间新增的连通线,实现局部装置间的流程优化和模块化组合运行,同时对工段间模块化组合之后的联锁进行了优化调整。     

基于提标升级改造的CAST工艺优化研究

利用CAST反应器处理生活污水,通过改变曝气时间、进水过程中曝气频率、气流速度,对比各参数条件下的出水水质,研究各参数对污染物去除的影响,探索它们与污染物去除之间的相关性,研究结果表明,试验条件下CAST工艺的最优工况为:进水时间40 min,进水过程中每5 min曝气一次,曝气量1.2 m3/h,曝气3 h,出水COD、氨氮和总磷达GB 18918-2002一级A标。且体系中DO与ORP的变化与污染物的去除也存在一定的相关性,两者随时间变化的转折点能用于指示氨氮达标的时间点。     

海因酶法生产N-氨甲酰-D-苯丙氨酸的动力学及温度的影响

利用从Burkholderia cepecia njut1中纯化得到的纯海因酶建立了利用苄基海因生产N-氨甲酰-D-苯丙氨酸的酶转化过程的动力学模型.研究表明,底物的消旋对转化有重要影响.探讨了温度对转化过程的影响,测定了不同温度下苄基海因的溶解常数、消旋常数及米氏常数.结果表明,温度对苄基海因转化过程有重要影响,提高海因酶的热稳定性对D-氨基酸的生产有重要意义.     

二氧化碳返炉对煤制天然气工艺的影响

为提高煤气化装置经济性,减少废水排放,将低温甲醇洗富集的CO_2,与蒸汽、O_2形成多元气化剂,在固定床气化炉中进行了工业试验。结果表明,返炉CO_2与煤焦发生气化反应,实现了碳资源再利用,减少了蒸汽用量和后续废水处理量,降低了能耗和生产成本。同时,CO_2返炉可调节煤气中H_2/CO比例,适用于不同的后续工艺,具有良好的经济效益和社会效益。     

DISSOLUTION OF ORNL HLW SLUDGE AND PARTITIONING OF THE ACTINIDES USING THE TRUEX PROCESS

ABSTRACT

Experiments were conducted to evaluate acid dissolution of actual high-level radioactive waste sludge and to evaluate the transuranium extraction (TRUEX) process for partitioning actinides from the dissolved sludge solution. All tests were performed at a temperature of 24°C.

Samples of sludge from Melton Valley Storage Tank W-25 were rinsed with mild caustic (0.2 M NaOH) to reduce the concentrations of nitrates and fission products associated with the interstitial liquid. In one campaign, the rinsed sludge was leached in nitric acid and about 50% of the dry mass of the sludge was dissolved. The resulting solution contained total metal concentrations of ～1.8 M with a nitric acid concentration of 2.9 M. The solution began gelling immediately, and a visible gel layer was observed after 8 days. In the other campaign, the sludge was neutralized with nitric acid to destroy the carbonates and was subsequently leached with 2.6 M NaOH for ～6 h before rinsing with the mild caustic. The sludge was then leached in nitric acid, and about 80% of the sludge dissolved. The resulting solution contained a total cation concentration (excluding H⁺) of ～0.6 M and a nitric acid concentration of 1.7 M. This solution became hazy in ～8 days, indicating gel formation, but did not display separated gel layers after aging for 20 days.

Batch liquid-liquid equilibrium tests of the extraction and the stripping operations were conducted. Chemical analyses of both phases were used to evaluate the process. Evaluation was based on two metrics: the fraction of TRU elements removed from the dissolved sludge, and comparison of the results with predictions made with the Generic TRUEX Model (GTM). The fractions of Eu, Pu, Cm, Th, and U removed from aqueous solution in only one extraction stage were >95% and were close to the values predicted by the GTM. Mercury was also found to be strongly extracted, with a one-stage removal of >92%. In one test, vanadium appeared to be moderately extracted.     

INFLUENCE ON THE DISTRIBUTION OF PHOSPHORUS BY ADDING AL-CONTAINING COMPONENT IN SLUDGE MELTING PROCESS

The laboratory scale experiments for determining the influence on the distribution of phosphorus by.adding Al-containing component in melting furnace were conducted. It is found that the addition of Al-containing component in melting furnace increased the amount of phosphorus in slag phase. Thermodynamic analysis of the industrial sludge melting process with the addition of different Al-containing components was also carried out. The compositions of slag and the gas in three different zones in melting furnace were obtained. The results also demonstrate that increasing the mole ratio Al/P of charged materials is an effective way to fix more phosphorus in slap, which can help reduce the amount of H3PO4 precipitate from guy in the waste heat boiler later.     

OVERVIEW AND SYSTEM ANALYSIS OF VARIOUS SEWAGE SLUDGE DRYING PROCESSES

ABSTRACT

An incineration process is routinely used in Japan to treat nearly all the generated sewage sludge. The drying process now is recognized to play an important role as a pretreatment process of a incineration process.

This paper provides a brief introduction to the conventionally utilized drying methods/equipment (i.e, hot gas drying, fluidized bed drying, pneumatic conveyor drying, and steam drying( for treating dewatered sludge cakes.     

序批式活性污泥法高温条件下的运行

根据序批式活性污泥法高温条件下的运行实例．对活性污泥法高温冲击、污泥高温驯化及高温条件下的运行情况进行分析、讨论与总结。详细描述温度升高时对污泥结构、污泥活性的影响。