The effect of dissolved oxygen (DO) concentration on aerobic granular sludge (AGS) treatment on simulated municipal sewage was studied in SBR reactor. By changing the amount of aeration, the DO concentration in SBR reactor was controlled respectively in the range of 3 mg/L≤ρ（DO）＜4 mg/L, 2 mg/L≤ρ（DO）＜3 mg/L and 1 mg/L≤ρ（DO）＜2 mg/L. The concentrations of COD, NH {}_{\mathrm{4}}^{+} -N, NO {}_{\mathrm{3}}^{—} -N, NO {}_{\mathrm{2}}^{—} -N, TN and P in the effluent were detected. The results show that the removal rates of COD, NH {}_{\mathrm{4}}^{+} -N and P are affected little by the DO concentration, but the removal rate of TN is affected significantly. When 3 mg/L≤ρ（DO）＜4 mg/L, 2 mg/L≤ρ（DO）＜3 mg/L和1 mg/L≤ρ（DO）＜2 mg/L, the removal rate of TN is 62.14%, 71.81% and 82.11% respectively; when 1 mg/L≤ρ（DO）＜2 mg/L, the removal rate of TN reached the best for the AGS system and the system was stable. The average removal rates of COD, NH {}_{\mathrm{4}}^{+} -N and P were 90.43%, 96.97% and 76.00%, respectively.

A series of SAPO⁃34 molecular sieves with different crystallization time were synthesized by hydrothermal method using pseudo⁃boehmite, silica sol and phosphoric acid as raw materials, TEA & TEABr as template. The crystal structure and physicochemical properties of the synthesized SAPO⁃34 molecular sieve were characterized by XRD, SEM and NH3⁃TPD. The catalytic activity of MTO was evaluated in a fixed bed reactor. The results showed that pure phase lamellar SAPO⁃34 molecular sieves were synthesized under different crystallization time. The longer the crystallization time was, the higher the crystallinity was, the greater the lamellar thickness was, and the more the acid centers were. At 450 ℃, 2 h-1, 0.2 MPa, crystallization time 72 h, the SAPO⁃34 molecular sieve had the best MTO catalytic activity with a single⁃pass lifetime 360 min and yield of diene 86.8%.

Di-solvent is composed with epichlorohydrin and furfural. Two methods of furfural and di-solvent were investigated in recycle the used lubricating oil for effects. The experimental results show that the optimal technology conditions of di-solvent refining are the volume ratio of oxidant to oil 1.0 and V(epichlorohydrin)∶V(furfural) 1.5∶1. The optimal technology condition of furfural refining is the volume ratio of oxidant to oil 1.5 .Under the optimal technology conditions, the used engine oil total yield reach 73.95%. The properties of the recovered oil are viscosity index at 118.4, after append to a process of clay-adsorption, the recovered oil could be circularly used by harmonicing of proper quantities additions.

The flocculation refining and solvent refining experiments was carried out to show that solvent refining is better for the recycling the lubricating oil waste. The optimal conditions of furfural refining were as follows: the ratio of solvent and oil 1.5, refining temperature 80 ℃|while the optimal condition of NMP refining was 1.0, refining temperature 60 ℃, so the furfural refining had a larger economic profits. Under the optimal technology conditions, the properties of the recovered oil were listed as follows: viscosity index 102.6, 25 ℃ refractive index 1.459 4, colourity 1.0, solidifying point -16 ℃, w(carbon residual)0.499%, w(S)0.057%, oil recovery 93.96%. According to this result, the recovered oil could reach the HVI standard of base oil. And the recovered oil could be used as finished lubricating oil after adding suitable amounts of additives.