【Introduction】The grass is strong and the wind is strong, and the torrent breaks the ice. On March 30, 2021, Deepwater Haina successfully landed on the ChiNext board of the Shenzhen Stock Exchange, ushering in an extraordinary 20 years. In the past 20 years, deep-water Haina has built and operated more than 800 environmental protection water projects led by technology and ingenuity, creating a number of boutique projects with benchmarking and demonstration significance.
To this end, we have grandly launched the "20 Years of Ingenuity" deep-water Haina boutique project tour, showing the craftsman spirit of deep-water Haina people. Recommended in this issue - Sanmenxia City, Henan Province, LingbaoCheng East Industrial Park Sewage Treatment Plant BOT Project: Deep-water Haina Industrial Park Sewage Treatment Solutions, Boost the Transformation and Innovation Development of the "Golden City".
The project name
Sanmenxia City, Henan Province, Lingbao City East Industrial Park sewage treatment plant BOT project
Project overview
The project is located in Lingbao City East Industrial Agglomeration Zone, Sanmenxia City, Henan Province, is the largest industrial sewage treatment project in Lingbao City, with a total construction scale of 30,000 m³/d, a total area of 28,656 square meters, of which the first phase of construction scale is 10,000 m³/d, the total investment of the first phase of the project is 35 million yuan, and the first phase covers an area of 12,300 square meters.
The project adopts the BOT model, with a concession period of 30 years (including the construction period), mainly treating industrial sewage in the park, domestic sewage of enterprise employees and domestic sewage of nearby residents, and the effluent quality implements the First Class A standard of "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002).
Sewage characteristics
The sewage treated in this project is mainly industrial sewage, which mainly contains pollutants such as CODcr, TN, NH3-N and TP. Because the TN removal rate in sewage should reach 57%, the NH3-N removal rate should reach 80%, and the TP removal rate should reach 85.7%, it is necessary to use a biological treatment process with good nitrogen and phosphorus removal effect.
Project difficulty analysis
Lingbao City, the city east of the Badi River is undergoing large-scale urban construction, because the east of the city sewage plant has not yet been built, the sewage collection pipe network is not yet perfect, resulting in domestic sewage, industrial production wastewater in the area can only be discharged into the natural ditch, polluting the urban environment and downstream river.
Introduction of project highlights
(1) Implementation effect
1) Reduce environmental impact
The effluent quality of this project implements the "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) Level A standard, and the effluent water quality has met the basic requirements for sewage reuse, which greatly improves the water quality and water environment in the region.
2) Intelligent control
Relying on the water management platform of Deepwater Haina Water Group Co., Ltd., the project fully realizes intelligent control, grasps the abnormal water quality of inlet and outlet water and the operation of equipment in real time, can quickly guide production, and improve the treatment efficiency of sewage and domestic sewage in industrial parks.
(2) Social benefits
In recent years, the "Golden City" Lingbao is accelerating into a period of transformation and innovation. The construction of this project not only strengthens the infrastructure construction of The urban area of Lingbao City, but also optimizes the investment environment of Lingbao City, which is an important part of enhancing the ability of "four sets and one turn" in the industrial agglomeration area of Lingbao City, and is also the basic guarantee for the healthy and sustainable development of Lingbao City.
(3) Ecological benefits
The implementation of the project will greatly reduce the discharge of industrial pollutants in the Lingbao Industrial Park, effectively reduce the pollution of the water environment, achieve the overall goal of reducing urban pollutant emissions, and have an important impact on improving the water quality of the river and protecting the water system of the Yellow River Basin.
Introduction to technical processes
Process flow diagram
This project adopts a combination of secondary biological treatment and advanced treatment, the secondary biological treatment adopts the modified A/A/O biological treatment process, the deep treatment adopts the activated sand filtration process, the sludge treatment and disposal adopts mechanical concentration and dehydration and then transports it to the nearby thermal power plant for mixed incineration treatment and sludge landfill as an alternative disposal method, and the disinfection process adopts chlorine dioxide disinfection process.
Highlights of technical process advantages
(1) Improved A/A/O process on the basis of the traditional A/A/O process to add a pre-hypoxia tank, pre-hypoxia tank and the role of biological selector, activated sludge here into endogenous respiration, denitrification and achieve nitrogen removal effect, to solve the nitrate, DO on the subsequent anaerobic pool phosphorus release interference, has a good nitrogen removal effect, and make full use of the carbon source in the sewage, low operating costs.
(2) Activated sand filter does not need to be stopped for backwashing; single-stage filter material is used, no gradation is required, there is no problem of uneven hydraulic distribution and primary filtrate; there is no need for electric and pneumatic valves for backwashing pump and its shutdown switching; no need for a single coagulation and clarification tank, no need for coagulation and clarification of mechanical equipment. As a result, activated sand filtration systems have a more compact footprint and are more economical in operating costs.
(3) The project water reaches the reuse standard, in addition to the staff domestic water using tap water, other process water, equipment washing, road watering and greening are used after the treatment of the standard water, to achieve the purpose of energy conservation and emission reduction, recycling of water resources.
Project reality map
Biochemical pool
Two sinking pools
Sludge dispensing wells