共查询到19条相似文献,搜索用时 140 毫秒
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锦州石化公司采用COBR(高级氧化与生物氧化组合工艺)组合工艺处理反渗透(RO)浓水,论述了COBR工艺流程、基本原理、工艺控制指标以及该工艺在锦州石化公司浓水处理装置的应用经验。结果表明,该工艺在一定的控制条件下,运行平稳,对RO浓水中的COD去除效果明显:COD去除率为57%;当进水浓度升高、波动较大时,该工艺仍具有很强的抗冲击能力:当进水浓度波动较大时,通过适当调节参数,出水COD仍可维持在50mg/L左右。 相似文献
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结合某电站废水"零排放"的设计,对高效反渗透(HERO)工艺进行了研究,探索了一种适合循环水排污水及同类型废水的高回收率的处理工艺,可以做到节水减排,并获得良好的经济性。 相似文献
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试验研究了碟管式反渗透(DTRO)工艺中运行压力、进水温度及电导率对膜分离效果的影响,分析探讨了工艺对川西气田采出水生化处理产水COD、氨氮、氯化物等指标的截留分离效果。试验结果表明,当运行压力6~7MPa、进水温度24~25℃、电导率32000~40000μS/cm时,DTRO工艺对气田采出水COD、氨氮和氯化物的截留率分别达到95.54%,80%,98.78%,DTRO膜系统平均回收率达50%,减量化效果显著。同时,较单独低温多效蒸馏,热-膜耦合工艺运行成本降低19.75%,具有一定的经济效益。 相似文献
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通过对反渗透装置初次化学清洗时进水水质、运行情况、反渗透系统进水端和浓水端情况、保安过滤器滤芯情况分析,确定造成膜污染的主要原因,并针对这些原因采取化学清洗、运行管理等一定措施。措施实施后:反渗透运行周期均有所增加,特别是1#反渗透装置,运行周期增至2 414h,达到健康运行要求。 相似文献
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Ronald C. Griffin 《Journal of the American Water Resources Association》2001,37(5):1335-1347
ABSTRACT: When the goal of water pricing is elevated from mere cost recovery to deriving the greatest value from scarce water and associated nonwater resources, conventional rate regimes are found to be deficient. To address the challenge of creating rates that are both efficient and budget-balancing, several theoretical and practical aspects of rate-making are considered. Purposeful selection of rate parameters for a specific billing system is demonstrated to serve efficiency and cost recovery objectives. Attention to non-accounting opportunity costs is an important system element, but these costs are often not fully borne by the utility or its customers. In situations where this issue is serious, state or federal pricing policy may be necessary. 相似文献
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The concern related to the drinking of reverse osmosis (RO) water containing low levels of minerals is growing day by day. This study involves the analysis of water samples from various drinking water sources in a rural site, Mirchpur village, an Indus Valley civilization site (grid location: 29° 18′ 42.3″ N, 76° 10′ 33.0″ E) of Hisar, India, along with the health survey of human subjects. The hydrochemistry of water collected from hand pumps, river canals, tube wells, submersibles, and the RO systems installed in various homes was explored for pH, EC, TH, TDS, turbidity, cations (Na+, Ca2+, Mg2+), anions (CO32−, HCO3−, Cl−, SO42−, NO3−, F−), and elements (Fe, Pb, Se) employing the ion chromatography, flame photometry, and ICP-AES techniques. Lead (Pb) and Selenium (Se) were detected in trace amounts (0.30–2.6 μg L−1; 0.10–4.1 μg L−1, respectively) in all the samples, including the samples collected from RO purifiers, but Iron (Fe) was not detected in RO samples even in trace amounts. The F-levels in hand pump water (HPW) and submersible water (SW) (1.9 and 1.7 mg L−1, respectively) and TDS levels in SW (3048 mg L−1) were found to be above WHO and BIS safe limits. TDS levels in the river canal (900 mg L−1), tube well (1104 mg L−1), hand pump (1170 mg L−1), and submersible samples (3048 mg L−1) were found significantly higher as compared to the RO personal water (ROPW; 216 mg L−1) and RO supply water (ROSW; 90 mg L−1). The collected epidemiological data reveals that 21%, 19%, 13%, and 12% of natives reported skin, kidney, hair fall, liver, and stomach issues, respectively, suspecting the crucial role of high TDS and fluoride levels in the area. This study also provides a comparison between the quality of RO and the direct supply water, along with correlation matrices for different parameters, which gives a rationale for the limitations of drinking direct supply water without any purification and RO water containing low mineral content. 相似文献
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待测样经蒸馏、乙醚萃取、氢氧化钠反萃取后,常见干扰物质均可以除去,PCP-Na溶液在波长320nm处有最大的吸收峰,其它酚类物质在该波长处不干扰测定。本法操作简便、快速、准确、经济,稳定性好。本法测定PCP-Na的回收率,在水中为100.74%,在土壤中为91.45%。 相似文献
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Hyperfiltration and nanofiltration membranes were tested with different water matrices for the removal of excess fluoride
from underground water. Initially, the experiments were done with synthetic samples prepared by adding known amounts of sodium
fluoride and calcium chloride in distilled water. The effect of feed water composition, pH, temperature of feed water, operating
pressure, and feed water flow rate on separation efficiency of both types of membrane was studied by varying one parameter
at a time and keeping all other parameters constant. Thus, the optimum operating conditions for the process were determined
and after that ground water samples collected from three villages of district Gurgaon, Haryana, India (Farukhnagar, Wazirpur,
and Mevka) were treated under optimum operational conditions. The mass transfer coefficient and membrane parameters were estimated
for each data point using two-parameter model (Film theory and Solution-diffusion model) to study the concentration polarization
on membrane surface. The nanofiltration membrane showed high percentage rejection of bivalent ions when compared to monovalent
ions in a binary system. But in multicomponent system, when fluoride and calcium coexisted, the removal of fluoride was comparable
to calcium removal because of the low solubility product of calcium fluoride. The results with RO membrane revealed that it
removes practically all the ions present in water at high pressure, which need to be passed through a lime column to remineralize
the water, to make it suitable for drinking purposes, whereas by running the system at low pressure which will further reduce
the cost of operation, rejection percentage goes down to get permeate of required quality. 相似文献
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Phosphorus (P) in irrigation runoff may enrich offsite water bodies and streams and be influenced by irrigation water quality and antecedent soil surface conditions. Runoff, soil loss, and P fractions in runoff using reverse osmosis (RO) water or mixed RO and well water (RO/ Tap) were studied in a laboratory sprinkler study to evaluate water source effects on P transport. A top- or subsoil Portneuf silt loam (coarse-silty, mixed, superactive, mesic Durinodic Xeric Haplocalcid), either amended or not amended with manure and/or with cheese whey, with Olsen P from 20 to 141 mg kg(-1) and lime from 108 to 243 g kg(-1), was placed in 1.5 x 1.2 x 0.2-m-deep containers with 2.4% slope and irrigated three times from a 3-m height for 15 min, applying 20 mm of water. The first irrigation was on a dry loose surface, the second on a wet surface, and the third on a dry crusted surface. Surface (ca. 2 cm) soil samples, prior to the first irrigation, were analyzed for Olsen P, water-soluble P (Pws), and iron-oxide impregnated paper-extractable P (FeO-P) analyses. Following each irrigation we determined runoff, sediment, dissolved reactive phosphorus (DRP) in a 0.45-microm filtered sample, and FeO-P and total P in unfiltered samples. Soil surface conditions had no effect on P runoff relationships. Water source had no significant effect on the relationship between DRP or FeO-P runoff and soil test P, except for DRP in RO runoff versus water-soluble soil P (r2 = 0.90). Total P in RO runoff versus soil P were not related; but weakly correlated for RO/Tap (r2 < 0.50). Water source and soil surface conditions had little or no effect on P runoff from this calcareous soil. 相似文献