The combined removals through conventional water treatment process of chlorination,flocculation-sedimentation and sand filtration for AOC,AOC-P17 and AOC-NOX in drinking water are-13.0%,17.1% and-83.3% respectively and which is evidently influenced by water temperature.
By means of co-palpitation of the radionuclide 131Ba with stable isotope Ba2+,flocculation by Al2(SO4)3, activated carbon adsorption and sand filtration,this paper introduce the the of the simulated synthetic 131Ba containing radioactive wastewater and the satisfactory results in which the final effluent 131Ba concentration was well below the maximum tolerant concentration in surface water sources.
The removal rate of the chromaticity is 57% and 37% respectively by biological sand filtration system and conventional water treatment,and the turbidity is 90% and 60-80%.
The principles,processes,costs and(effects) of different disinfection techniques were summarized,especially a new method of slow sand filtration was introduced.
At first the raw water was pre treated by micro flocculation and sand filtration to improve the membrane flux and the removal of organics substances in further UF process.
For printing and dyeing waste water, adopting the technology of coagulation sediment and pre-processing sand filtration is capable of removing almost all turbidity and partial chroma .
Furthermore,sand filtration and chemical coagulation-flocculation treatment utilized at the plant could reduce bacteria number by 2 log10.If reclaimed water is expectedly used in domestic,an additional disinfection maybe required so that it will not be harmful to public health.
The results show that when the concentration of the coagulant Al2(SO4)3·18H2O is 100 mg/L,the concentration of PAM is 3 mg/L,the pH value of the wastewater is 5.5 and the inlet water is of ρ(CODCr) 12 000 mg/L,the ρ(CODCr) of the effluent water can be reduced down to 750 mg/L after coagulation filtration plus quartz sand filtration.
Full-scale study results show that the nitrobenzene concentration in inlet water is below 2 μg/L after 2 h adsorption by PAC in the intake pipe,while it is between 25.9-66.2 μg/L in raw water,and below 1 μg/L in purified water after sand filtration. The turbidity of purified water is about 1 NTU.
Fecal coliform showed the same rate of reduction as a result of sand filtration, while it reached undetectable numbers in the effluent of GAC contactors.
The plant system consists of sand filtration, gamma-irradiation, ozonation and ion-exchange.
Slow sand filtration results in lower quantities of organic particulate material and organisms passing through into supply, rather than rapid gravity filtration, and the community is smaller and of different structure.
Coli and faecal streptococci (enterococci) as the result of slow sand filtration
More than 99.9% of the BPA contained in raw leachates was removed by a conventional series of treatment processes consisting of biological treatment, coagulation, sedimentation, sand filtration, and activated carbon adsorption.
On the basis of experimental results, the following three methods are suggested to prevent the settling of larvae and the killing or removing of adults of fouling mussels in pipelines:1.Sand filtration. Before water is pumped into the pipelines, it is made to pass through sand layer 3 cm. or more in thickness and consisting of grains between No. 40 and No. 60 standard sieve in size. It has been proved, that with such thickness and grain size, the sand layer is effective in preventing the entrance...
On the basis of experimental results, the following three methods are suggested to prevent the settling of larvae and the killing or removing of adults of fouling mussels in pipelines:1.Sand filtration. Before water is pumped into the pipelines, it is made to pass through sand layer 3 cm. or more in thickness and consisting of grains between No. 40 and No. 60 standard sieve in size. It has been proved, that with such thickness and grain size, the sand layer is effective in preventing the entrance of eggs or larvae of mussels and other fouling organisms 65u or more in size.2.Poisoning with arsenic trioxide. One of the great difficulties of exterminating mussels is that they are able to protect themselves by closing their valves in the presence of poisonous substances, hence greatly prolonging the time needed for chemical treatment. If chemicals can be found which are poisonous to the mussels but to the presence of which they are not very sensitive then the duration of chemical treatment will be greatly shortened. Experiments prove that arsenic trioxide is the desired chemical, concentration of 100-400 p. p. m. being sufficient to kill the mussels in 20 minutes to 2 hours.3.Chlorinated lime treatment. One percent chlorinated lime, containing 38.6% available chlorine, in sea water is found to be able to dissolve the attached byssus threads of the mussels in 10 minutes. By such a treatment, the mussels will be detached from the pipelines and may be easily washed off with water flow.It is suggested that the second and third treatment may be periodically used before the mussels grow to a size that will be detrimental to the plant equipmants.
It has been more than a decade since the need for advanced treatment waetwater reuse was recognized in the world and our country。 The treatment process of waetewater for reuse is generally primary treatment secondary treatment and tertiary treatment which includes coagulation clarification sand filtration and chlorine disinfection ate. This paper reported that bentonite was used as a absorbent orcoagulan aid to remove pollutants in waetewater such as TOC. COD. ss etc. It can reduce the treatment costs...
It has been more than a decade since the need for advanced treatment waetwater reuse was recognized in the world and our country。 The treatment process of waetewater for reuse is generally primary treatment secondary treatment and tertiary treatment which includes coagulation clarification sand filtration and chlorine disinfection ate. This paper reported that bentonite was used as a absorbent orcoagulan aid to remove pollutants in waetewater such as TOC. COD. ss etc. It can reduce the treatment costs and simplify treatment process.
A technological process contained coagulation--floation--sand filtration--activated carbon adsorption was presented in order to treat waste water (COD>1000mg/1), oil content (>4g/1) of rinsed oii in paint factory. The experiment showed that COD was removed 98％ and more after choosing the suitable coagulant aluminum sulfate and optimizing its dose, and COD, oil content, and suspended solid met State Discharge Standard through the sand filter and activated carbon adsorption column. Adsorptive capacity...
A technological process contained coagulation--floation--sand filtration--activated carbon adsorption was presented in order to treat waste water (COD>1000mg/1), oil content (>4g/1) of rinsed oii in paint factory. The experiment showed that COD was removed 98％ and more after choosing the suitable coagulant aluminum sulfate and optimizing its dose, and COD, oil content, and suspended solid met State Discharge Standard through the sand filter and activated carbon adsorption column. Adsorptive capacity No, constant of speed of flow K and critical bed depth Do of activated carbon adsorption column in Bohart--Adams equation were calculated based on the break--through curve of activated carbon.
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