In the process of designing a municipal rainwater and sewage pumping station,it is necessary to accurately grasp the design points,reasonably determine the scale of the rainwater and sewage pumping station,scientifica...In the process of designing a municipal rainwater and sewage pumping station,it is necessary to accurately grasp the design points,reasonably determine the scale of the rainwater and sewage pumping station,scientifically select the location and layout,and select materials reasonably.After completing the process design of the municipal rainwater and sewage pumping station and putting it into operation,in order to ensure the normal and stable operation of the pumping station,it is necessary to focus on strengthening the operation and management of diving equipment,cleaning equipment,and electromechanical equipment.The author analyzes the key points and specific design path of the process design of municipal rainwater and sewage pumping stations,and puts forward effective strategies for operation management,hoping to contribute to the scientific design and stable operation of municipal rainwater and sewage pumping stations.展开更多
Physical separation apparatuses;a vibrating screen, a 4-inch hydrocyclone and a Multi-Gravity Separator (MGS) were used to recover phosphorus as MAP (magnesium ammonium phosphate, MgNH<sub>4</sub>PO<sub...Physical separation apparatuses;a vibrating screen, a 4-inch hydrocyclone and a Multi-Gravity Separator (MGS) were used to recover phosphorus as MAP (magnesium ammonium phosphate, MgNH<sub>4</sub>PO<sub>4.</sub>6H<sub>2</sub>O) from anaerobic digested sludge of two sewage-treatment plants A and B. For plant A, the MAP grade increased from 0.08% to 88.9% with 90.4% recovery and for plant B, the grade increased from 0.11% to 73.8 with 93.2% recovery. The collected MAP products containing impurities such as organic materials and heavy metals were further upgraded through dry and wet magnetic separation tests at different magnetic flux densities. A dry magnetic separator was tested on both MAP products (MAP-A and MAP-B), while the wet magnetic separation process was exclusively experimented for the removal of impurities from MAP-B. Feed samples, as well as magnetic and nonmagnetic products were analyzed by absorption spectroscopy, XRD, ICP-AES, polarizing microscope observation, and SEM-EDX. The grade of MAP products could be improved by about 4% - 9% after magnetic separation (the most appropriate magnetic force being 15,000 Gauss). During both dry and wet magnetic separation processes, not only heavy metals have been removed, but also nonmagnetic constituents like Al, Ba, and Ca. This may be attributed to the attachment of fine magnetic particles on the nonmagnetic surfaces, rendering them magnetic properties.展开更多
The removal of phosphate from municipal sewage by high gradient magnetic separation using aluminium sulphate as precipitating agent and Fe3O4 as seeding material was studied. The effects of aluminium sulphate, Fe3O4, ...The removal of phosphate from municipal sewage by high gradient magnetic separation using aluminium sulphate as precipitating agent and Fe3O4 as seeding material was studied. The effects of aluminium sulphate, Fe3O4, magnetic field intensity, pH value and flow-rate of sewage on phosphorus removal rate were investigated. The results show that addition of 200 mg/L Al2（SO4）3·18H2O and 300 mg/L Fe3O4, magnetic field intensity of 200 kA/m, pH value of 4.57.0 and flow-rate of 6.15 cm/s are both efficient and economic technical parameters for removal of phosphate. The pH value has a tremendous effect on the removal of phosphate. In the pH range of （4.5）7.0, more than 95% phosphate can be removed. Theoretical analysis indicates that the solubility of AlPO4 is minimum at pH 4.07.0 and the electrostatic attractive force between AlPO4 and Fe3O4 is maximum at pH 4.5（6.5.）展开更多
[目的]探讨规模化奶牛场不同处理工艺下污水的盐分特征规律,以期为粪污资源化利用提供理论依据。[方法]分别采集河北省17家奶牛场挤奶厅、尿液和固液分离后等经典型工艺处理的污水,测定Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)、Ca^(2+)含...[目的]探讨规模化奶牛场不同处理工艺下污水的盐分特征规律,以期为粪污资源化利用提供理论依据。[方法]分别采集河北省17家奶牛场挤奶厅、尿液和固液分离后等经典型工艺处理的污水,测定Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)、Ca^(2+)含量及全盐量和电导率,分析电导率与盐分离子间的相关性。[结果]奶牛场尿液中无机盐组分以Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)为主,且随着处理工艺的推进,固液分离后无机盐含量逐渐降低,而挤奶厅污水中盐分含量总体上较低,仅Cl^(-)含量略高(436 mg/L);污水中各阶段的全盐量和电导率存在显著差异,且尿液的全盐量和电导率均显著高于挤奶厅和固液分离后的全盐量和电导率,分别为52.2 g/L、23.3 m S/cm;相关性分析表明,全盐量与电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)均呈极显著正相关,相关性最弱的离子是Ca^(2+)。[结论]规模化奶牛场污水中尿液无机盐离子和全盐量最高,固液分离后的次之,挤奶厅的最低,且电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)可表征研究污水盐度的特征因子。展开更多
文摘In the process of designing a municipal rainwater and sewage pumping station,it is necessary to accurately grasp the design points,reasonably determine the scale of the rainwater and sewage pumping station,scientifically select the location and layout,and select materials reasonably.After completing the process design of the municipal rainwater and sewage pumping station and putting it into operation,in order to ensure the normal and stable operation of the pumping station,it is necessary to focus on strengthening the operation and management of diving equipment,cleaning equipment,and electromechanical equipment.The author analyzes the key points and specific design path of the process design of municipal rainwater and sewage pumping stations,and puts forward effective strategies for operation management,hoping to contribute to the scientific design and stable operation of municipal rainwater and sewage pumping stations.
文摘Physical separation apparatuses;a vibrating screen, a 4-inch hydrocyclone and a Multi-Gravity Separator (MGS) were used to recover phosphorus as MAP (magnesium ammonium phosphate, MgNH<sub>4</sub>PO<sub>4.</sub>6H<sub>2</sub>O) from anaerobic digested sludge of two sewage-treatment plants A and B. For plant A, the MAP grade increased from 0.08% to 88.9% with 90.4% recovery and for plant B, the grade increased from 0.11% to 73.8 with 93.2% recovery. The collected MAP products containing impurities such as organic materials and heavy metals were further upgraded through dry and wet magnetic separation tests at different magnetic flux densities. A dry magnetic separator was tested on both MAP products (MAP-A and MAP-B), while the wet magnetic separation process was exclusively experimented for the removal of impurities from MAP-B. Feed samples, as well as magnetic and nonmagnetic products were analyzed by absorption spectroscopy, XRD, ICP-AES, polarizing microscope observation, and SEM-EDX. The grade of MAP products could be improved by about 4% - 9% after magnetic separation (the most appropriate magnetic force being 15,000 Gauss). During both dry and wet magnetic separation processes, not only heavy metals have been removed, but also nonmagnetic constituents like Al, Ba, and Ca. This may be attributed to the attachment of fine magnetic particles on the nonmagnetic surfaces, rendering them magnetic properties.
文摘The removal of phosphate from municipal sewage by high gradient magnetic separation using aluminium sulphate as precipitating agent and Fe3O4 as seeding material was studied. The effects of aluminium sulphate, Fe3O4, magnetic field intensity, pH value and flow-rate of sewage on phosphorus removal rate were investigated. The results show that addition of 200 mg/L Al2（SO4）3·18H2O and 300 mg/L Fe3O4, magnetic field intensity of 200 kA/m, pH value of 4.57.0 and flow-rate of 6.15 cm/s are both efficient and economic technical parameters for removal of phosphate. The pH value has a tremendous effect on the removal of phosphate. In the pH range of （4.5）7.0, more than 95% phosphate can be removed. Theoretical analysis indicates that the solubility of AlPO4 is minimum at pH 4.07.0 and the electrostatic attractive force between AlPO4 and Fe3O4 is maximum at pH 4.5（6.5.）
文摘[目的]探讨规模化奶牛场不同处理工艺下污水的盐分特征规律,以期为粪污资源化利用提供理论依据。[方法]分别采集河北省17家奶牛场挤奶厅、尿液和固液分离后等经典型工艺处理的污水,测定Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)、Ca^(2+)含量及全盐量和电导率,分析电导率与盐分离子间的相关性。[结果]奶牛场尿液中无机盐组分以Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)为主,且随着处理工艺的推进,固液分离后无机盐含量逐渐降低,而挤奶厅污水中盐分含量总体上较低,仅Cl^(-)含量略高(436 mg/L);污水中各阶段的全盐量和电导率存在显著差异,且尿液的全盐量和电导率均显著高于挤奶厅和固液分离后的全盐量和电导率,分别为52.2 g/L、23.3 m S/cm;相关性分析表明,全盐量与电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)均呈极显著正相关,相关性最弱的离子是Ca^(2+)。[结论]规模化奶牛场污水中尿液无机盐离子和全盐量最高,固液分离后的次之,挤奶厅的最低,且电导率、Cl^(-)、SO_(4)^(2-)、Na^(+)、K^(+)可表征研究污水盐度的特征因子。
