What measures has Langli Town of Changsha taken to control environmental pollution?

Environmental impact analysis, countermeasures and measures to prevent or mitigate adverse environmental impacts.

1, atmospheric environmental impact during construction

(1) dust

Wet operation is used to suppress dust, excavated earthwork is piled up in a centralized way, and water is sprayed regularly on the construction site and the road surface where transport vehicles are driving; Strengthen the management of transport vehicles, try to avoid residential areas, and implement speed limit driving on main roads in construction areas; Commercial concrete should be used, the building material storage yard should be located at a fixed point, and dust-proof measures such as enclosure and covering should be taken. Cement and lime building materials are used in bulk by tank trucks, and necessary measures such as spraying and dust suppression can be taken during loading and unloading operations; Fences are set up in sensitive areas of the construction site to reduce the spread of construction dust and landscape impact.

(2) Smell

Building fences around the construction site; Take protective measures for construction personnel, such as wearing protective masks and masks; Sediment is transported by closed tank car, avoiding busy areas and densely populated areas; It is suggested that the dredging season should be chosen in winter, and the smell of dredging is not easy to spread.

(3) Fuel waste gas

Ensure the speed of transport vehicles and reduce idle time; Large transport vehicles and bulldozers burning diesel need to install exhaust gas purifiers, and the exhaust gas should meet the standards; Strengthen the maintenance of construction machinery and transport vehicles; Construction equipment shall not use inferior fuel.

2. Water environment impact during the construction period

(1) Construction wastewater

On-site treatment facilities are set up in the construction work area, and all kinds of construction wastewater are collected through the trench for oil separation and precipitation treatment. The treated water circulation is used for road washing and tire cleaning of vehicles entering and leaving the work area; Use spoil to build cofferdams around the spoil ground, do a good job in the basement treatment of the spoil ground, adopt paved natural clay to prevent seepage, optimize the design of the yard, strengthen the natural sedimentation effect, set up multiple barriers in the spoil ground, prolong the retention time of residual water in the spoil ground, increase the tail water discharge process, and give full play to the sedimentation effect; Chemical agents are added for dosing and precipitation treatment to reduce the pollutant content in the residual water in the yard. In order to ensure that the waste water in the waste dump reaches the first-class standard of Integrated Wastewater Discharge Standard (GB8978- 1996), non-woven fabric filtration facilities are set at the discharge port; Laying intercepting trunk pipes and setting cofferdams in dry season to reduce the pollution of water environment during construction; Oil shall not be piled up near the river water body, and a retaining wall with a height of 50cm shall be built around the bulk material storage yard to prevent wind and rain from washing into the water body; Pay attention to the cleanliness of the site to avoid oil leakage from construction machinery. If there is oil leakage, measures should be taken in time to collect it and properly handle it with special equipment.

(2) Domestic wastewater

After being treated by septic tank, engineering domestic sewage is used for greening in nearby areas and agricultural fertilization in farmland and vegetable fields.

(3) Dredging wastewater

Dry excavation method is adopted for river dredging in this project, and cofferdam is set in the dredging section after construction diversion.

3. Water environment impact during operation period

(1) The competent environmental protection department urges the standard construction of coastal sewage outlets, and it is strictly forbidden to directly discharge sewage into the Xinhe River system.

(2) Strengthen and improve the water environment supervision and monitoring system, strictly carry out water quality monitoring, and establish an effective sewage supervision and punishment system to ensure the water quality requirements of Xinhe River Basin and Zhantian Lake functional area.

4, acoustic environmental impact

Construction period: mainly take measures to reduce the sound level of equipment, reasonably arrange the construction time and site layout, strengthen personal protection, reduce man-made noise and traffic noise during transportation.

Operation period: vibration and noise reduction of equipment; Sound insulation treatment of gate hoist room and water pump room; Strengthen the maintenance and management of gates, pumps and other equipment; In the vicinity of pumping stations and gate hoists, measures such as greening and planting should be taken to reduce the impact of noise generated by abnormal operation of pumping station equipment on surrounding residents.

5. Impact of solid waste on the environment

(1) Dredged silt should be transported as soon as possible, and closed transport vehicles should be used to prevent scattering along the way. For sludge that cannot be transported after being dug ashore, put it into straw bags for storage.

② The comprehensive utilization of sediment should be based on the principle of combining treatment with development, centralized utilization with decentralized utilization, and make full use of the resource value of sediment.

③ Anti-seepage measures should be taken for abandoned silt field, and cofferdam should be built around it. In the design and construction of cofferdam, it is suggested to set anti-slide piles and adopt different cofferdam construction materials to improve the overall stability of cofferdam.

(4) The construction spoil is also concentrated in the designated spoil ground, leveled and compacted in time, and then ploughed again after the construction. In rainy days, the surface of the turnover site should be covered. At the same time, the waste soil and slag yard of the project should be specially designed to prevent soil erosion.

⑤ The wastes generated in the construction process must be recycled.

⑥ The construction unit strengthens the management of domestic garbage in the construction work area, sets garbage bins in different categories, and entrusts the local sanitation department to remove them regularly.

All landowners after the completion of the project, set up clear signs, it is forbidden to dump garbage in the river and on both sides of the river, and assign special personnel to patrol to prevent water pollution and block flood discharge in the river.

6. Ecology

From the aspects of strengthening the publicity and education of environmental awareness of construction personnel, protecting the surface and vegetation, preventing soil erosion during construction, etc., the potential impact on the ecological environment can be reduced as much as possible.

After the construction is completed, vegetation restoration measures or reclamation measures shall be taken for the exposed surface; According to the greening and beautification design of the project, the greening project within the scope of land acquisition will be implemented to compensate for the loss of ecosystem function caused by the completion of the project, and at the same time maintain coordination with the urban landscape to achieve better landscape effect; In the construction of green space, we should pay attention to the combination of arbor, shrub and grass, pay attention to the ecological relationship between different plants, and use more native species for greening, so as to maintain the regional biodiversity and the stability of the ecosystem. The United States imported Puweixin JD.COM to effectively prevent smog inhalation!