we select flocculation-precipitation preprocessing when the number over 10 and selecl the method of distilling sample when the number below 10. The pH should be controlled strictly and move to neutral after dealing with the water sample because it affect the absorbency greatly.
The experimental results still indicate that the accumulative biogas production can be(1?500) mL(10 g straw) in 14 days after pre-treatment in 4(mg/L) NaOH solution and the dissolved COD in the solution reaches(39?000)(mg/L) after 24 hours.
In addition,the experiment shows that the lignin content in the straw is reduced from 28% to 19% after pre-treatment in 1.5%(in weight) NaOH solution,and it can improve the straw treatment efficiency using high solid anaerobic digestion process.
Biological aerated filter(BAF) was used for pre-treatment of the Zhujing River water. The result showed that under the condition of air/water ratio of 2∶1,filter velocity of 7.5m/h,water temperature of over 15℃,and influent ammonia nitrogen of 4.6mg/L or less,the removal rate of ammonia nitrogen was 70%~95%,and there was no nitrite accumulated in the reactor.
The optimal of technological parameters were studied. The result of the orthogonal test showed that when the coking wastewater was pretreated with ASBR, the optimal T/Trwas 0.5, the optimal strength of mixing was 300mlgas/min(1.5m3gas/m3reactor d), the optimal pattern of the intermittent mixing was mixing 100s every 45min.
CaO is also used as sedimentation aid reagent and 1.0% active carbon as sorbent The effect shows that CODcr removal rate of pretreated percolate is 30%, NH3-N removal rate is 21. 0% and BOD 5removal rate is 28. 6%.
Results showed that optically variable pigments can be prepared by coating Cr2O3 on the surface of the pretreated TiO2-coated mica.
The mice were pretreated with heat stress followed by ischemia/reperfusion by clipping bilateral cervical common arteries for 7 min.
Mice were divided randomly into four groups as follows: (1) normal control group; (2) heat stress pretreated subsequent to ischemia/reperfusion group (HS/IR); (3) ischemia/reperfusion group (IR); and (4) heat stress group (HS).
Enzyme recovery in high-solids enzymatic hydrolysis of steam-pretreated willow: Requirements for the enzyme composition
Weakly adsorbed enzymes displayed a hydrolysis efficiency of not less than 80% per IFPU enzyme consumed in extended hydrolysis of pretreated willow as compared to the original enzyme mixture.