共查询到19条相似文献,搜索用时 765 毫秒
1.
采用絮凝-漂白粉催化氧化法,筛选出硫酸镁催化剂,提高难生化处理的印染废水对色度、COD的去除效果。实验结果表明,对COD_(Cr) 592 mg/L、色度625倍、pH 9.82、SS 150 mg/L的某印染废水,当废水p H为6时,投加Al_2(SO_4)_3·18H_2O 400 mg/L、聚丙烯酰胺(PAM)2 mg/L,催化剂硫酸镁80 mg/L,有效氯30%的漂白粉1.0 g/L,CODCr最终去除率达到88.2%,色度去除率98.4%,浊度去除率86.6%,出水pH为6,达到国家二级排放标准。催化氧化的脱色速率提高近一倍,结果对印染废水的处理研究和实际应用具有一定价值。 相似文献
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采用厌氧-曝气生物滤池(AF-BAF)工艺处理工业水杨酸废水,研究了不同进水ρ[COD(NaAc)]/ρ[COD(SA)]比值[表示乙酸钠与水杨酸(SA)的化学需氧量(COD)浓度配比]对有机物去除和脱氮效果的影响。结果表明,当进水SA浓度低于187mg/L时,经AF工艺处理后,废水生化需氧量(BOD)5/COD由0.27增大至0.38,UV254/氧化还原电位(ORP)由-7.68增大至-3.22,可生化性明显提高。最佳水力停留时间(HRT)为10h,当比值为300∶300时,COD去除率最高(91.74%),SA去除率为91.4%;当比值为0∶600时,COD去除率最低(42%),SA去除率为52.48%。进水碳源变化对NH4+-N去除影响较小,去除率可达99.83%。SA功能菌依赖于非SA功能菌分泌的代谢产物生存,失去非SA功能菌分泌的代谢产物后,SA功能菌的活性开始降低。 相似文献
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根据染料中间体吡啶-2-酮生产废水的特点,提出了利用“氧化、脱色和絮凝”三位一体的物化方法处理这种废水;探究了搅拌速度、絮凝反应时间、pH值、药剂用量、废水浓度和温度对COD去除率和脱色率的影响,得出了最佳工艺条件.研究结果表明,在常温下,两性聚丙烯酰胺NDPAM用量35 mg/L,氧化交联剂PDO用量0.55 mL/L,pH=5.7,搅拌速度80 r/m in,絮凝时间为15 m in和静止时间为30 m in的条件下,COD的去除率和脱色率均达到98%,处理后的废水达到了可生化的指标范围.并对处理成本和絮凝动力学机理进行了探讨. 相似文献
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镀铜铁屑-H_2O_2催化氧化降解含酚废水 总被引:2,自引:0,他引:2
采用镀铜铁屑代替传统Fenton体系中的FeSO4作为催化剂,通过改变H2O2与镀铜铁屑的投加量、溶液的pH值、反应温度、反应时间等条件,研究了该体系对处理苯酚废水的影响。结果表明,常温下处理实际含酚印染废水,在pH值为4~6,30%H2O2 12mL/L,镀铜铁屑5g/L,反应时间为45min时,COD去除率可达96%,其CODCr从5827mg/L降至419mg/L,色度从2000降至30,符合国家三级排放标准。 相似文献
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采用四格室厌氧折流板反应器(ABR)在常温下处理油田含部分水解聚丙烯酰胺(HPAM)的污水。通过优化运行参数,确定了对含HPAM污水处理的最适水力停留时间(HRT)和有机负荷(OLR)。在厌氧处理过程中,OLR为1、1.3、2和4kg COD/m3.d时对应的HRT分别为24、18、12与6h。研究结果表明,ABR在水力停留时间为24h时,系统对CODCr和HPAM的去除率达到最高,分别为0.945和0.662;当HRT为6h时,系统的pH、CODCr和HPAM的降解率明显下降,挥发性脂肪酸大量积累。通过对降解前后HPAM的红外光谱分析可知,ABR能形成对HPAM有较好降解效果的微生物群落,微生物菌落能够利用HPAM作为碳源和氮源供自身生长所需。 相似文献
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将树脂吸附剂应用于焦化废水的深度处理,考察了温度、投加量、初始pH、时间和流速对CODcr和色度去除效果的影响.静态吸附实验确定了最佳吸附树脂为NDA-99型树脂,最佳投加量为3.00g/L,无需调节pH,最佳温度为303K,吸附等温线满足Freundlich方程.通过动态实验确定了最适宜工艺条件为:流速20BV/h,单柱废水处理量为200BV/批;处理后废水中CODcr浓度从199mg/L降到100mg/L以下,色度从98倍降到50倍以下.使用8%的NaOH溶液脱附再生,最佳脱附流速为5BV/h. 相似文献
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选取玄武岩纤维作为生物接触氧化系统的载体,以COD、NH4+-N、TP和DO为考核指标,对比系统在不同水力停留时间下对黑臭水体的净化效能,并分析其差异性。结果表明,系统在HRT=24 h时经济性好且净化效果佳,对COD、NH4+-N和TP的平均去除率分别达到81.7%、52.1%和68.2%,将DO从4 mg/L提升至8.8 mg/L。本研究为黑臭河道治理提供理论依据。 相似文献
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Efforts were made to assess the efficiency of an anaerobic filter packed with porous floating ceramic media and to identify
the optimum operational condition of anaerobic filter as a pretreatment of swine wastewater for the subsequent biological
removal of nitrogen and phosphorus. A stepwise decrease in hydraulic retention time (HRT) and an increase in organic loading
rate (OLR) were utilized in an anaerobic filter reactor at mesophilic temperature (35°C). The optimum operating condition
of the anaerobic filter was found to be at an HRT of 1 d. A soluble chemical oxygen demand (COD) removal efficiency of 62%
and a total suspended solids removal efficiency of 39% at an HRT of 1 d were achieved with an OLR of 16.0 kg total COD/(m3·d), respectively. The maximum methane production rate approached 1.70 vol of biogas produced per volume of reactor per day
at an HRT of 1 d. It was likely that the effluent COD/total Kjeldahl nitrogen ratio, of 22, the COD/total phosphorous ratio
of 47, and the high effluent alkalinity >2500 mg/L as CaCO3 of the anaerobic filter operated at an HRT of 1 d was adequate for the subsequent biological removal of nitrogen and phosphorus. 相似文献
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The performance of a 20-L anaerobic biofilter treating 2-ethyl-hexanoic acid (2-EHA) operating with the effluent recirculated
was compared with that of the same biofilter operated without any recirculation. The recirculation of effluent was at a rate
of 60 L/h through the biofilter. Tracer experiments were carried out to study the hydrodynamics in the biofilter under different
modes of operation. The dispersion number (D/UL) obtained from these tracer experiments for the biofilter operated with and
without effluent recirculation were 0.65 and 0.06, respectively. These values show that the recirculation was effective in
achieving a mixed-flow pattern in the biofilter, whereas the biofilter operated without recirculation was essentially a plug-flow
column with a moderate level of axial dispersion.
The feed consisted of 2-EHA at a concentration of 8200 mg/L, which is equivalent to a COD of 20,000 mg/L. The optimal performance
of the mixed-flow biofilter was at a hydraulic retention time (HRT) of 1.1 d, with a COD removal efficiency of 92.8% and a
biogas production rate of 6.44 L/L biofilter vol/d. The biofilter failed at 0.83 d HRT, as a result of washout of biomass
at this high hydraulic loading rate. By comparison, the optimal performance achieved for the plug-flow system was at 2 d HRT.
The COD removal efficiency was 74.1%, and biogas production rate was 2.13 L/L biofilter vol/d. When the HRT was lowered to
1.5 d, failure occurred owing to inhibition as indicated by the low methane yield of 0.192 L/g COD removed. The superior performance
of the mixed-flow mode can be attributed to the presence of the recycle stream, which diluted and evenly distributed the feed. 相似文献
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Kalyuzhnyi S Gladchenko M Epov A Appanna V 《Applied biochemistry and biotechnology》2003,109(1-3):181-195
As a first step of treatment of landfill leachates (total chemical oxygen demand [COD]: 1.43–3.81 g/L; total nitrogen: 90–162
mg/L), performance of laboratory upflow anaerobic sludge bed reactors was investigated under mesophilic (30°C), submesophilic
(20°C), and psychrophilic (10°C) conditions. Under hydraulic retention times (HRTs) of about 0.3 d, when the average organic
loading rates (OLRs) were about 5 g of COD/(L·d), the total COD removal accounted for 81% (on average) with the effluent concentrations
close to the anaerobic biodegradability limit (0.25 g of COD/L) for mesophilic and submesophilic regimes. The psychrophilic
treatment conducted under an average HRT of 0.34 d and an average OLR of 4.22 g of ducted under an average HRT of 0.34 d and
an average OLR of 4.22 g of COD/(L·d) showed a total COD removal of 47%, giving effluents (0.75 g of COD/L) more suitable
for subsequent biologic nitrogen removal. All three anaerobic regimes used for leachate treatment were quite efficient for
elimination of heavy metals (Fe, Zn, Cu, Pb, Cd) by concomitant precipitation in the form of insoluble sulfides inside the
sludge bed. The application of aerobic/anoxic biofilter as a sole polishing step for psychrophilic anaerobic effluents was
acceptable for elimination of biodegradable COD and nitrogen approaching the current standards for direct discharge of treated
waste-water. 相似文献
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Combined biologic (anaerobic-aerobic) and chemical treatment of starch industry wastewater 总被引:2,自引:0,他引:2
Sklyar V Epov A Gladchenko M Danilovich D Kalyuzhnyi S 《Applied biochemistry and biotechnology》2003,109(1-3):253-262
A combined biologic and chemical treatment of high-strength (total chemical oxygen demand [CODtot] up to 20 g/L), strong nitrogenous (total N up to 1 g/L), and phosphoric (total P up to 0.4 g/L) starch industry wastewater was investigated at laboratory-scale level. As a principal step for COD elimination, upflow anaerobic sludge bed reactor performance was investigated at 30 degrees C. Under hydraulic retention times (HRTs) of about 1 d, when the organic loading rates were higher than 15 g of COD/(L.d), the CODtot removal varied between 77 and 93%, giving effluents with a COD/N ratio of 4-5:1, approaching the requirements of subsequent denitrification. The activated sludge reactor operating in aerobic-anoxic regime (HRT of about 4 d, duration of aerobic and anoxic phases of 30 min each) was able to remove up to 90% of total nitrogen and up to 64% of COD tot from the anaerobic effluents under 17-20 degrees C. The coagulation experiments with Fe(III) showed that 1.4 mg of resting hardly biodegradable COD and 0.5 mg of phosphate (as P) could be removed from the aerobic effluents by each milligram of iron added. 相似文献
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Anaerobic treatment of low-strength brewery wastewater in expanded granular sludge bed reactor 总被引:2,自引:0,他引:2
Anaerobic treatment of low-strength brewery wastewater, with influent total chemical oxygen demand (COD) (CODin) concentrations ranging from 550 to 825 mg/L, was investigated in a pilot-scale 225.5-L expanded granular sludge bed (EGSB) reactor. In an experiment in which the temperature was lowered stepwise from 30 to 12 degrees C, the COD removal efficiency decreased from 73 to 35%, at organic loading rates (OLR) of 11-16.5 g COD/L/d. The applied hydraulic retention time (HRT) and liquid upflow velocity (Vup) were 1.2 h and 5.8 m/h, respectively. Under these conditions, the acidified fraction of the CODin varied from 45 to 90%. In addition to the expected drop in reactor performance, problems with sludge retention were also observed. In a subsequent experiment set at 20 degrees C, COD removal efficiencies exceeding 80% were obtained at an OLR up to 12.6 g COD/L/d, with CODin between 630 and 715 mg/L. The values of HRT and Vup applied were 2.1-1.2 h, and 4.4-7.2 m/h, respectively. The acidified fraction of the CODin was above 90%, but sludge washout was not significant. These results indicate that the EGSB potentials can be further explored for the anaerobic treatment of low-strength brewery wastewater, even at lower temperatures. 相似文献
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Kim Jung K. Cho Jae H. Lee Jung S. Hahm Kyung S. Park Don H. Kim Si W. 《Applied biochemistry and biotechnology》2002,98(1-9):753-764
We developed a process for production of methane at a pilot scale. This process consists of three stages. The first stage
is a semianaerobic hydrolysis/acidogenic step in which organic wastes are converted to various sugars, amino acids, and volatile
fatty acids (VFAs). Operation temperature and pH were 45°C, and 5.0–5.5, respectively. Hydraulic retention time (HRT) was
2 d. To remove the putrid odor and to enhance the hydrolysis of organic wastes, a mixture of bacteria isolated from landfill
soil was inoculated into the reactor. Total chemical oxygen demand (tCOD) and biological oxygen demand (BOD) were 36,000 mg/L
and 40,000 mg/L, respectively. The second stage was an anaerobic acidogenic process, which can produce large amount of VFAs
including acetate, propionate, butyrate, valerate, and caproate. Operation temperature and pH were 35°C, and 5.0–5.5, respectively.
HRT was 2 d. The third stage was a strictly anaerobic methane fermentation step producing methane and carbon dioxide from
VFAs. The working volume of upflow anaerobic sludge blanket (UASB) type reactor was 1200 L, and operation temperature and
pH were 41°C, and 7.7–7.9, respectively. HRT was 12 d. Seventy two percent of methane at maximum was generated and the yield
was 0.45–0.50 m3/kg VS of food wastes. Through the process, 88% of tCOD and 95% of BOD were removed. The wastewater was treated with the biological
aerobic and anaerobic filters immobilized with heterotrophic and autotrophic nitrifying and denitrifying bacteria. Ninety
percent of total nitrogen (T-N) was removed by this treatment. The residual T-N and total phosphorous (T-P) were removed by
the algal periphyton treatment system. The final concentrations of nitrogen and phosphorous in the drain water were 53 and
7 mg/L, respectively. 相似文献
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Single-stage anaerobic codigestion for mixture wastes of simulated Korean food waste and waste activated sludge 总被引:2,自引:0,他引:2
Nam Hyo Heo Soon Chul Park Jin Suk Lee Ho Kang Don Hee Park 《Applied biochemistry and biotechnology》2003,107(1-3):567-579
Korean food waste was treated with a single-stage anaerobic codigester (SSAD) using waste activated sludge (WAS) generated
from a municipal wastewater treatment plant. The stability and performance of the system was analyzed. The C/N ratio was improved
with increasing food waste fraction of feed mixture. The pH, alkalinity, and free ammonia nitrogen concentration were the
parameters used to evaluate the digester’s stability. The experimentally determined values of the parameters indicated that
there were no methane inhibitions in the digester. Digester performance was determined by measuring the total chemical oxygen
demand TCOD), volate solids (VS) removal, methane content in biogas, methane production rate (MPR), and specific methane productivity.
Methane content in biogas and MPR were significantly dependent on hydraulic retention time (HRT) and ratio of food waste to
WAS. The methane content in biogas decreased at shorter HRT or higher organic loading rate (OLR) with increased food waste
fraction. Concerning the performance of the codigester, the optimum operating condition of the SSAD was found to be at an
HRT of 10 d with a feed mixture ratio of 50% food waste and 50% WAS. A TCOD removal efficiency of 53.6% and a VS removal efficiency
of 53.7% were obtained at an OLR of 5.96 kg of TCOD/(m3·d) and 3.14 kg of VS/(m3·d), respectively. A maximum MPR of 1.15 m3 CH4/(m3·d) and an SMP of 0.37 m3 CH4/kg of VSfeed were obtained at an HRT of 10 d with a methane content of 63%. 相似文献
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Applied Biochemistry and Biotechnology - An anaerobic biofilter was operated with 4500 mg COD/L food-processing waste water, fed at 10 d of hydraulic retention time (HRT). In 45 d after seeding,... 相似文献
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Textile and dye industries are main sources of dye bearing effluent. In present studies the anaerobic biological degradation of Acid Red 3BN dye water (AR3BNDW) and mixed dye water (MDW) for reduction of color and COD were studied in sequential batch reactor (SBR). The sludge as sources of microorganism was arranged from maize processing bio methanation wastewater treatment plant, which was acclimatized for treatment of AR3BNDW and MDW. After the acclimatization, dyes degradation were studied in SBR At optimum operation condition of hydraulics retention time (HRT) = 2.5 d, and treatment time (tR) = 16 h, AR3BNDW have gone maximum 87% color reduction of 500 mg/L dye, and 82.8% COD reduction of 380 mg/L COD. At same operating condition, 84.5% color reduction of 500 mg/L dye, and 79.42% COD reduction of 413 mg/L COD achieved for MDW. The second order Grau model was fitted well for COD and dye reductions. The kinetics parameter were evaluated for both the dye water. 相似文献