In view of the increasingly serious pollution problem of cement industry and the increasingly strict requirements for desulfurization wastewater discharge，this study proposed to use the waste heat of clinker of grate cooler to evaporate the desulfurization wastewater of cement furnace.This method realized zero discharge.The effects of atomization and evaporation of desulfurization wastewater at the grate cooler on flue gas temperature，NOx concentration，ammonia escape concentration and flue gas dust mass concentration were studied by experiments on a cement furnace production line with a clinker output of 6000t/d and mixed with dry sludge.The experiment results show that NH3 produced after the evaporation of desulfurization wastewater enters the decomposition furnace with the tertiary air and reacts with NOx in the furnace，and this process is conducive to reducing the ammonia injection of SNCR (selective non catalytic reduction) system.Under the full load of the furnace and maintaining the stable working condition of SNCR system and dry sludge mixing，the NOx emission concentration gradually decreases with the increase of desulfurization wastewater injection.When the injection amount of wastewater is 5.5m3/h，the NOx concentration reaches the lowest value.The evaporation of desulfurization wastewater at the high temperature section of grate cooler will reduce the temperature of tertiary air and secondary air，and inhibit the generation of thermal NOx in decomposition furnace.The evaporation of desulfurization wastewater in high temperature environment will produce HCl and SO2 gas，which has a certain impact on the efficiency of wet desulfurization.

The partial nitrificated domestic sewage treated in the autors laboratory was added into the anaerobic ammoxation ASBR reactor as raw wastewater，and NaNO₂ or CH₃COONa was added quantitatively when the temperature was（24±0.5）℃and pH was 8.0~8.2.The effects of NO₂^--N/NH₄⁺-N ratio，hydraulic retention time (HRT) and C/N ratio (COD/NH₄⁺-N) on anammox coupled denitrification and decarbonization were investigated respectively.The interaction among the three factors was explored by response surface analysis method.The results show that，when the NO₂^--N/NH₄⁺-N ratio was 1.4~1.6，HRT was 33 h，and C/N ratio was 3~5，the system's anammox coupled denitrification and carbon removal efficiency were the highest.Analysis of variance (ANOVA) results show that the degree of influence of each factor on the total nitrogen removal rate (TNR) was：C/N ratio>HRT>NO-2-N/NH+4-N ratio.The optimal matching scheme is C/N ratio：4.28，HRT：33.48h，and NO₂^--N/NH₄⁺-N ratio：1.46，and the average TNR verified by parallel experiments was 90.12% .

The biological activity of a biotrickling filter determines the capability of a biological treatment plant in treating organic waste gas，and the most important factor affecting the bioactivity of activated sludge is the microbial community.In order to understand the microbial community structure，diversity and abundance in a biotrickling filter，metagenomic technology was used to analyze the microbial diversity of filler solids in the biofilter of volatile organic compound treatment system.The results show that the relative abundance of bacteria，eukaryotes，archaea，viruses in biotrickling filter are 89.34%，1.99%，1.06% and 0.03% respectively，and the microbes are assigned to 75 phylums，195 classes，395 orders，752 families and 1798 genera.Bacteria in activated sludge are mainly Proteobacteria，Actinobacteria，Bacteroidetes，Firmicutes and Chloroflexi.In addition，18 toluene degrading bacteria strains，21 xylene degrading bacteria strains and 15 butyl acetate degrading bacteria strains were screened from the activated sludge using the only carbon source medium，which were mainly identified as Acinetobacter sp.and Pseudomonas sp..The degradation rates of 100 mg/L toluene，p-xylene and m-xylene are 99.98%，99.89% and 88.34% within 48h by the degrading strain CX20.The butyl acetate degrading strain CBA12 can completely degrade 100mg/L of butyl acetate within 48h.The isolated strains show good VOC degradation ability and have a wide application prospect in the field of waste gas treatment.