Improvement strategies for environmentally friendly Concrete batching plant

 Environmental protection is a mandatory inspection during the completion and acceptance of a concrete mixing plant and a fundamental requirement for building a civilized mixing plant. Meeting environmental standards requires effective control of dust, wastewater, noise, and solid waste. The primary energy sources for a mixing plant are water, electricity, and gas. Once the equipment and technical solutions for the mixing plant are finalized, energy consumption cannot be reduced through technological innovation; instead, it can be reduced through strengthened management and rational recycling.

Wastewater Treatment for Concrete batching plant Projects:

Wastewater from Concrete batching plant projects primarily consists of equipment and mixer cleaning wastewater, transport vehicle cleaning wastewater, site cleaning wastewater, and domestic sewage. Equipment and vehicle cleaning is performed on a dedicated cleaning platform, then collected by drainage channels surrounding the platform and sent to a sedimentation tank for reuse. Site flushing wastewater is collected by drainage channels surrounding the site and sent to a sedimentation tank for reuse.

Wastewater from Concrete batching plant projects primarily consists of equipment and mixer cleaning wastewater, transport vehicle cleaning wastewater, site cleaning wastewater, and domestic sewage. Equipment and vehicle cleaning is performed on a dedicated cleaning platform, then collected by drainage channels surrounding the platform and sent to a sedimentation tank for reuse. Site flushing wastewater is collected by drainage channels surrounding the site and sent to a sedimentation tank for reuse.
(1) Wastewater Treatment Measures:
Equipment cleaning water, transport vehicle cleaning wastewater, and site cleaning wastewater are collected in a designed sedimentation tank. The supernatant flows into a clear water tank, where it is pumped back into the concrete mixer, mixed with the materials, and then incorporated into the finished product.
(2) Rainwater treatment measures:A large amount of rainwater will hit the ground and produce wastewater containing cement and fine sand. Direct discharge will pollute the surrounding water environment of the assessment area. The construction unit should set up an initial rainwater collection pool to collect and precipitate the initial rainwater, and then reuse it in production after sedimentation. After the sedimentation of the wastewater sedimentation pool is settled in the inclined sedimentation pool, the sediment is manually cleaned to the pool sedimentation and drying area. After drying, it is processed by a sand and gravel separator and reused in production.

Analysis of the impact of Concrete batching plant on the air environment:

The waste gas pollutants generated by the production of the Concrete batching plant project are mainly silo dust, mixing silo dust, and transportation dust.
(1) Silo dust: During the feeding of powdered raw materials for the production of the Concrete batching plant project, a certain amount of dust will be generated at the exhaust port on the top of the silo. The generated dust will be discharged after being treated by the silo top dust collector connected to the exhaust port. The breathing holes on the top of each raw material silo are equipped with silo top bag dust collectors (pulse dust collectors). The dust removal efficiency can reach more than 99.5%, meeting the requirements of environmental protection standards.
(2) Mixing dust: The mixer generates dust during batching. The mixer is equipped with a dust collector at the feed inlet to ensure that the dust generated by the mixer is discharged in compliance with the emission standards. The dust removal efficiency can reach over 99.9%, meeting the requirements of environmental protection standards.
(3) Analysis of the impact of unorganized dust: Unorganized dust mainly comes from transportation dust, with a dust volume of approximately 0.136t/a. Based on the characteristics of atmospheric pollutants emitted by the Concrete batching plant project, the unorganized dust at the project site is calculated using an estimation model. The cement and other powdered materials in the project are transported in a closed manner to minimize the impact on residents on both sides of the road.

Noise pollution from Concrete batching plant:

The noise sources of the Concrete batching plant project are mainly the mixing station noise and the mixing vehicle noise. According to on-site monitoring data from similar enterprises, the primary noise pollution sources after the equipment went into operation were the mixing unit noise, the noise from the concrete tanker, the belt conveyor noise, and the noise from the cement tanker transporting cement. The combined noise intensity reached 80.16dB(A). Regarding the Concrete batching plant model: Based on noise propagation laws, the total noise attenuation from the noise source to the receiving point is a combination of the distance between the noise source and the receiving point, air absorption, green belt obstruction, and building barriers.
Large noise sources are below 60dB at a distance of 15 meters, meeting the Class 2 requirements of the “Environmental Noise Emission Standard for Industrial Enterprises” (GB12348-2008). There are no residential areas within 100m of the Concrete batching plant project, which ensures that the noise during operation will not have a significant impact on the surrounding environment. In order to ensure that the factory boundary noise is controlled within the Class 2 standard limit of the “Environmental Noise Emission Standard for Factory Boundaries of Industrial Enterprises” (GB12348-2008), it is recommended that the project adopt the following noise prevention and control measures:
(1) The Concrete batching plant is sealed and the noise is treated with vibration reduction;
(2) For the noise of raw material transport vehicles, the maintenance of vehicles is strengthened to maintain normal operation and reduce noise. Drivers drive smoothly and honking is prohibited in the factory;
(3) For the noise of raw material loading and unloading operations and cement transport by tank trucks, the speed is controlled, vibration reduction pads are installed, and the transportation time is reasonably selected;
(4) For the noise of belt conveyors, the conveyor belt is sealed and vibration reduction is treated;
(5) The greening of the factory area is strengthened, and tall broad-leaved plants can be selected to purify and beautify the environment;
(6) The project prohibits production from 22:00 to 6:00 at night. After implementing the above measures, the daytime noise level at the factory boundary meets the Class 2 standard specified in the “Environmental Noise Emission Standard for Industrial Enterprises” (GB12348-2008).

Measures for Solid Waste Pollution from the Concrete batching plant:

The dust collected by the dust removal system in the Concrete batching plant project is stored in a dedicated temporary storage tank and can be reused in production. The sediment in the sedimentation tank primarily consists of reusable materials such as sand, so the sediment is collected and recycled.