Waste pulp(WP)is a typical byproduct of paper industry,and Chemical-looping gasification(CLG)as a recently developed technology is highly suited to dispose high-volatile wastes like WP.In order to make a high-efficien...Waste pulp(WP)is a typical byproduct of paper industry,and Chemical-looping gasification(CLG)as a recently developed technology is highly suited to dispose high-volatile wastes like WP.In order to make a high-efficiency oxygen carrier(OC)for CLG of WP,the Ni-containing electroplating sludge(NES)was used as the matrix and NiO modification was performed to enhance the hydrogen production in CLG.These resulted in a potentially high-efficiency OC denoted as NNES.Testing CLG of WP was in a fixed-bed reactor at 850℃by adopting NNES as the OC,injecting 2.4 mL/g(WP)water,and keeping a mass ratio of 1.0 between OC to WP.It produced 1.73 Nm^(3)/kg syngas that has an LHV of 11.9 MJ/Nm^(3)and a H_(2)/CO ratio of 3.63.In 10 redox cycles,the syngas yield did not have obvious decrease,but a certain reduction in the activity of NNES was observed.Characterization of the spent NNES revealed that it is the Ni agglomeration and inert silicate generation which reduced the activity of NNES.展开更多
Three kinds of craft waste liquids, which are by-products in the pulp industry and contain much lignin, were used as dispersing additives for preparing Horonai coal CWM(coal water mixture). The experiments showed t...Three kinds of craft waste liquids, which are by-products in the pulp industry and contain much lignin, were used as dispersing additives for preparing Horonai coal CWM(coal water mixture). The experiments showed that the CWM exhibited the lowest viscosity when it was diluted with an appropriate amount of water with the waste eiquids added. The experiments also indicated that the maximum coal concentration in the practically applicable CWMs whose apparent viscosity has to be below 1000 mPa·s increased from 56.5% to 62.5%(mass fraction), and 56.5% is the maximum coal mass fraction of the CWM prepared without additives. These data show the effectiveness of the waste liquids as the additives for preparing CWMs. The zeta potential of coal particles in the CWMs changed with the addition of lignin. From the change, the steric repulsion effect of the lignin adsorbed on the coal particles is concluded to be mainly responsible for the CWM dispersion. The waste liquids contain less sulfur than PSSNa(polystyrene sulfonate sodium salt), a typical dispersant which is currently used for preparing the commercial CWM, when the sulfur content in the unit mass of the solid matters within the waste liquids is compared with that in unit mass of PSSNa. This fact suggests that the waste liquids are more advantageous than PSSNa as far as air pollutants are concerned.展开更多
New methods for both the treatment of pulp waste liquor called black liquor （BL） and the recovery of chemicals by using plasma, and the concentration of BL with the freezing technique were developed. The new methods...New methods for both the treatment of pulp waste liquor called black liquor （BL） and the recovery of chemicals by using plasma, and the concentration of BL with the freezing technique were developed. The new methods aiming at the pilot plant scale are described and the experiments in a small-scale research facility for demonstration and test are presented. The energy consumption for treating waste liquid is 1 kg/kWh. Plasma processing can reduce the costs for treatment and eliminate pollution.展开更多
Given the environmental pollution caused by petroleum-based plastics,finding alternative substitutes for sustainability has become critical.Polyhydroxybutyrate(PHB),a storage food material that is accumulated by sever...Given the environmental pollution caused by petroleum-based plastics,finding alternative substitutes for sustainability has become critical.Polyhydroxybutyrate(PHB),a storage food material that is accumulated by several bacteria,is biodegrad-able,safe,environment friendly and comparable to conventional plastics.However,scale-up is an issue due to high produc-tion cost.Substrate replacement using renewable,plentiful,sustainable and low-cost carbon sources derived from industrial waste facilitates waste reduction,while also enabling the synthesis of value-added products.In this context,inexpensive pulp and paper industrial waste as carbon source was exploited for production of PHB by using previously isolated(Source:hot springs of Manikarn,Himachal Pradesh,India)thermophilic bacteria Bacillus sonorensis NAM5 under optimized conditions in a fermenter.Production was done in a fermenter under optimized conditions(72 h of incubation at 50℃temperature and 7 pH)to enhance the accumulation of PHB.The bacterial strain was able to produce 5.28±0.11 gL^(-1)after 72 h of growth without any carbon and nitrogen source supplementation to the industrial effluent.The culture accumulated 66%PHB of cell dry weight(CDW).The produced polymer was characterized through FTIR,NMR and TGA.Additionally,bacteria-treated industrial wastewater was used for phytotoxicity assay on agriculturally important crops such as wheat,maize and mung,which exhibited considerable difference in growth parameters.展开更多
基金supported by the Key-Area Research and Development Program of GuangDong Province[2020B1111380001]Guangdong Basic and Applied Basic Research Foundation[2021B1515020068].
文摘Waste pulp(WP)is a typical byproduct of paper industry,and Chemical-looping gasification(CLG)as a recently developed technology is highly suited to dispose high-volatile wastes like WP.In order to make a high-efficiency oxygen carrier(OC)for CLG of WP,the Ni-containing electroplating sludge(NES)was used as the matrix and NiO modification was performed to enhance the hydrogen production in CLG.These resulted in a potentially high-efficiency OC denoted as NNES.Testing CLG of WP was in a fixed-bed reactor at 850℃by adopting NNES as the OC,injecting 2.4 mL/g(WP)water,and keeping a mass ratio of 1.0 between OC to WP.It produced 1.73 Nm^(3)/kg syngas that has an LHV of 11.9 MJ/Nm^(3)and a H_(2)/CO ratio of 3.63.In 10 redox cycles,the syngas yield did not have obvious decrease,but a certain reduction in the activity of NNES was observed.Characterization of the spent NNES revealed that it is the Ni agglomeration and inert silicate generation which reduced the activity of NNES.
基金Supported by the Core Research for Evolutional Science and Technology(CREST) ,Japan Science and TechnologyCorporation(JST)
文摘Three kinds of craft waste liquids, which are by-products in the pulp industry and contain much lignin, were used as dispersing additives for preparing Horonai coal CWM(coal water mixture). The experiments showed that the CWM exhibited the lowest viscosity when it was diluted with an appropriate amount of water with the waste eiquids added. The experiments also indicated that the maximum coal concentration in the practically applicable CWMs whose apparent viscosity has to be below 1000 mPa·s increased from 56.5% to 62.5%(mass fraction), and 56.5% is the maximum coal mass fraction of the CWM prepared without additives. These data show the effectiveness of the waste liquids as the additives for preparing CWMs. The zeta potential of coal particles in the CWMs changed with the addition of lignin. From the change, the steric repulsion effect of the lignin adsorbed on the coal particles is concluded to be mainly responsible for the CWM dispersion. The waste liquids contain less sulfur than PSSNa(polystyrene sulfonate sodium salt), a typical dispersant which is currently used for preparing the commercial CWM, when the sulfur content in the unit mass of the solid matters within the waste liquids is compared with that in unit mass of PSSNa. This fact suggests that the waste liquids are more advantageous than PSSNa as far as air pollutants are concerned.
文摘New methods for both the treatment of pulp waste liquor called black liquor （BL） and the recovery of chemicals by using plasma, and the concentration of BL with the freezing technique were developed. The new methods aiming at the pilot plant scale are described and the experiments in a small-scale research facility for demonstration and test are presented. The energy consumption for treating waste liquid is 1 kg/kWh. Plasma processing can reduce the costs for treatment and eliminate pollution.
文摘Given the environmental pollution caused by petroleum-based plastics,finding alternative substitutes for sustainability has become critical.Polyhydroxybutyrate(PHB),a storage food material that is accumulated by several bacteria,is biodegrad-able,safe,environment friendly and comparable to conventional plastics.However,scale-up is an issue due to high produc-tion cost.Substrate replacement using renewable,plentiful,sustainable and low-cost carbon sources derived from industrial waste facilitates waste reduction,while also enabling the synthesis of value-added products.In this context,inexpensive pulp and paper industrial waste as carbon source was exploited for production of PHB by using previously isolated(Source:hot springs of Manikarn,Himachal Pradesh,India)thermophilic bacteria Bacillus sonorensis NAM5 under optimized conditions in a fermenter.Production was done in a fermenter under optimized conditions(72 h of incubation at 50℃temperature and 7 pH)to enhance the accumulation of PHB.The bacterial strain was able to produce 5.28±0.11 gL^(-1)after 72 h of growth without any carbon and nitrogen source supplementation to the industrial effluent.The culture accumulated 66%PHB of cell dry weight(CDW).The produced polymer was characterized through FTIR,NMR and TGA.Additionally,bacteria-treated industrial wastewater was used for phytotoxicity assay on agriculturally important crops such as wheat,maize and mung,which exhibited considerable difference in growth parameters.
