The systemof HCl-IMC-NH4F is adopted to clean the simulated boiler. When thevolume fraction of hydrochloric acid is 5% , the volume fraction of IMC-5 is 0.3% and the concentration of ammonium fluoride is 3 g/L, the corrosion-preventing efficiency can reach 99% after the boiler is dealt with for 5 hours at 60~80℃.
The flux recoveries of the three membranes can reach from 93.4% to 99.9% under the cleaning condition of back wash time 40 minutes,cleaning agent of 0.1% NaOH solution,and operating pressure difference of 0.08 MPa.
After continuous operation of the column packed with immobilized enzyme for 10 days in the space velocity of 1.5 h'1 at 50°C, 12% of initial enzyme activity was lost under the condition of using pH6.5 buffer to wash column per 20 h and the hydro -sis rate of lactose was 70.1 % which accorded with the request of low-lactose milk.
Effective methods had been adopted to control membrane fouling, of which chemical cleaning is of utmost importance to guarantee the long smooth operation of the DT-RO system.
At present, the 1st stage cleaning cycle by Cleaner A and Cleaner C is conducted every 100 and 500 h, respectively, depending on raw the water quality.
The possibility of microbiological cleaning of water and soil polluted with asymmetric dimethylhydrazine (ADMH), a highly toxic ingredient of rocket fuel (IRF), was studied.
Development and Testing of the Biosorbent Ekosorb Prepared from an Association of Oil-Oxidizing Bacteria for Cleaning Oil-Pollut
The use of this biosorbent for cleaning oil-polluted sod-podzol soils showed a two- to threefold cleanup rate acceleration at different pollution levels (8 and 24 l/m2), especially in the presence of a nitrogen-phosphate fertilizer.
Moreover, this newly built system can reduce the time taken washing the sample cell from 30 min or so to about 10 min.
High-solids enzymatic hydrolysis of steam-exploded willow without prior water washing
Dynamic studies of biosorbents prepared from a microbial biomass showed that neomycin industrial waste products are highly efficient in treating galvanic washing water.
After addition of dithionite, inducing reduction and consequent decomposition of the inhibitor, and subsequent removal of dithionite by washing, the functional activity of PS-2 was completely restored.
The membranes with the hydrophilic surface are less susceptible to fouling than hydrophobic membranes, while the ability to recover the performance upon washing is higher for the membranes with a chemically neutral surface than for charged membranes.