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How to Choose the Right Wastewater Treatment System for a Concrete Mixing Plant
Release time:
2026-07-15
Source:
Author:
Summary:
Wastewater generated during the operation of concrete mixing plants contains high concentrations of suspended solids, alkaline substances, and residual admixtures. If discharged untreated, it can cause severe environmental pollution. Selecting an appropriate wastewater treatment system requires a comprehensive assessment of factors such as treatment capacity, water quality characteristics, discharge standards, and operating costs. The following sections systematically outline key considerations from four perspectives: system type, technical parameters, equipment configuration, and operation and maintenance management.
I. System Type Matching and Processing Requirements
1. Physical Treatment System
Applicable to suspended solids ( SS ) High content (typically > 5000mg/L ) Wastewater is treated to remove particulate matter through processes such as sedimentation and filtration:
Sedimentation tank: Designed as either a horizontal-flow or radial-flow type, with a detention time of… ≥4 hour, SS The removal rate can reach 70%-80% ；
Filter press: Plate-and-frame or chamber filter presses can reduce the moisture content of sludge to 60% Below, mud-water separation is achieved.
A large batching plant employs “ Sedimentation tank + Filter press ” Combined treatment process, daily wastewater treatment capacity 200 m³ , effluent SS Stabilized at 100mg/L The following.
2. Chemical Treatment System
For alkaline wastewater ( pH > 12 ) or heavy-metal‑containing wastewater must be treated using chemical methods such as acid–base neutralization and coagulation–sedimentation:
Neutralization tank: Hydrochloric acid or sulfuric acid is added to adjust the pH. pH To 6-9 , reaction time ≥30 minutes;
Flocculant addition: Polyacrylamide is selected ( PAM ) As a flocculant, the dosage is 0.5-2mg/L , can enhance SS Removal rate up to 90% That is all.
A certain engineering case demonstrates that the chemical treatment system treats wastewater. pH From 13.5 Drop to 7.2 , heavy metal ion concentration decreases 95%。
3. Biological treatment system
If the wastewater contains organic matter ( Cash on Delivery > 500mg/L ), biological contact oxidation or the activated sludge process must be employed:
Biological contact oxidation tank: packing fill ratio ≥60% , hydraulic retention time ≥6 hour, Cash on Delivery The removal rate can reach 80%-90% ；
MBR Membrane bioreactor: Combines membrane separation technology to produce effluent. Cash on Delivery < 50mg/L , and can be directly reused in production.
Upgrade of a certain concrete mixing station MBR After the system was implemented, the wastewater reuse rate increased from 30% Upgrade to 85% , annual water-saving costs exceed 50 Ten thousand yuan.
II. Technical Parameters Matching Water Quality Characteristics
1. Processing Capacity Design
Determine the system throughput based on the batching plant’s production capacity:
Nissan Concrete 500 m³ The following sites, select processing capacity. 20-50 m³/h of the system;
Nissan Concrete 1000 m³ The above-mentioned sites require configured processing capacity. ≥100 m³/h of the system.
It should be reserved during design. 20% Buffer capacity to accommodate production fluctuations.
2. Water Quality Compliance Requirements
In accordance with the “Standard for Water Used in Concrete” ( JGJ63-2006 ) and local environmental protection standards:
pH Value: 6-9 ；
SS ： ≤500mg/L (Reclaimed water) or ≤100mg/L (Discharge water);
Cash on Delivery ： ≤150mg/L (Reclaimed water) or ≤80mg/L (Discharge water).
If local standards are more stringent, additional advanced treatment units—such as reverse osmosis or sand filtration—will be required.
III. Optimizing Equipment Configuration for Operational Efficiency
1. Core Equipment Selection
Sludge pump: Select a screw pump or a diaphragm pump, with a flow rate fluctuation range of… ≤10% , its wear resistance is superior to that of centrifugal pumps;
Chemical dosing system: Uses metering pumps to precisely control the dosage of flocculant, with an error… ≤±5% ；
Automation control system: integrates liquid level, pH , flow sensor, enabling unattended operation.
A certain concrete mixing plant has reduced labor costs through automation upgrades. 60% , reduced medication waste 30%。
2. Energy-saving and consumption-reducing design
Prioritize gravity‑flow design to reduce the energy consumption of lift pumps.
Employing variable-frequency drive technology, the equipment automatically adjusts its operating frequency in response to changes in water flow.
Recycle the filtrate from the filter press to reduce the amount of fresh water required.
A certain system has reduced its annual electricity consumption through energy-saving optimization. 40% , water consumption reduced 25%。
IV. Operations and Maintenance Management Ensures Long-Term Stability
1. Ease of maintenance
The equipment features a modular design, facilitating rapid maintenance.
Sludge discharge valves are installed in the sedimentation tank to enable automatic sludge removal.
The filter press is equipped with an automatic cleaning system, extending the service life of the filter cloth.
Through modularization, the system’s single maintenance duration has been reduced from… 4 Hours shortened to 1 Hour.
2. Cost-benefit analysis
Initial investment: physical systems < chemical systems < biological systems;
Operating costs: The chemical system’s reagent expenses account for a significant share (approximately…). 0.5-1.5 Yuan /m³ ), the biological system has relatively high electricity consumption (approximately 1-2 Yuan /m³ );
Reuse value: Treated water can be used for vehicle washing, equipment cooling, and other applications, helping to reduce water‑related costs. 0.8-1.2 Yuan /m³ 。
According to comprehensive calculations, the investment payback period is typically 2-3 Year.
The selection of a wastewater treatment system for a concrete mixing plant shall be based on… “ Technically feasible, economically viable, and easy to manage. ” As a principle, a large ready-mixed concrete company, after conducting comparative analysis, ultimately selected… “ Sedimentation tank + Filter press + Biological contact oxidation ” Combined process, total system investment 120 Ten thousand yuan, annual operating costs 35 Ten thousand yuan; all treated effluent is reused, resulting in annual savings on water resource fees and wastewater discharge fees exceeding… 200 Ten thousand yuan, achieving a win-win outcome for both environmental and economic benefits.
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Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
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