1. Technical name: Coupled ecological restoration technology in situ and exsitu in urban water bodies

2. Applicable industries: Applicable to urban black and smelly water treatment, urban water quality maintenance and water quality maintenance of urban water bodies and water sources

three, scope of application: Applicable to urban black and smelly water treatment, urban water quality maintenance and water quality protection of water sources

Use indigenous emerging plants and submerged plants to build ecological decoloring bodies, and use plants 'absorption of nitrogen and phosphorus to reduce the eutrophication level of water bodies and inhibit the reproduction of algae; use the roots of emerging plants and submerged plants to adsorb suspended solids in water, Strengthen turbidity removal and improve transparency; Coupled with in-situ treatment technologies such as ultrasonic algae inhibition and sediment aeration, coupled with bypass purification technology, the cavitation effect of ultrasound is used to inhibit the growth of low-concentration algae, the oxidation reduction potential and stability of anaerobic sediment is used to improve the oxidation-reduction potential and stability of anaerobic sediment, and the bypass purification has enhanced removal effect on suspended solids and turbidity indicators, and the use of floating matter salvage devices to maintain the water surface landscape effect. The resulting technical combination can effectively remove nitrogen, phosphorus, and suspended solids in the water body. It can improve the ORP and stability of anaerobic sediment, increase the transparency of water bodies, and improve the landscape effect and ecological effect of water bodies. Targeted removal of pollution load in water bodies, improving water self-purification capacity, and adjusting operating load according to water quality characteristics and water body functional goals to save energy and reduce consumption

It solves the problems of poor self-purification ability, no environmental capacity, continuous accumulation of endogenous pollution, deepening chroma, and easy deterioration of water quality. It proposes a unit combination technology based on plant ecological restoration, supplemented by artificial aeration, bypass filtration and ultrasonic algae inhibition. The ultrasonic algae inhibition technology can produce obvious algae inhibition effect. The bypass purification has a turbidity removal rate of 81%. The water quality can be maintained for a long time after the technology is applied.

The water environment of Beidaihe Forest and Wetland Park has been improved, with a water surface area of 15 hectares and a black and smelly water body length of 1.8 kilometers. Adopt in-situ ecological restoration technology, coupled with pipe interception and offline treatment stations to achieve water quality restoration and water environment improvement. After 100 days of restoration, the main water quality indicators of water quality reached Class IV water bodies

Taking the improvement of the water environment in Beidaihe Forest and Wetland Park as an example, the main body of plant restoration is 600 yuan/m2, including three-year maintenance costs, and the plant coverage rate is not less than 25%; the investment and operation costs of ultrasonic equipment are 100 yuan/m2; The scale of the ectopic treatment station is 3500m3/d, the investment is 18 million yuan, and the operating cost is 0.6 yuan per ton of water.

The effluent from the sewage treatment station can be used as ecological replenishment of water bodies and save fresh water resources. It can save 1.2 million tons of fresh water a year. Based on the water resource fee of 1 yuan/m3, the annual saving is 120 yuan, and the investment payback period is about 15 years; Beidaihe Forest Wetland Park The deterioration of water quality has led to the intensification of blackness, odorous and eutrophication of the water body, which has become a shackle for the further improvement of its landscape viewing and tourism and leisure quality. Therefore, after the improvement of the water environment, the economic and environmental benefits are very outstanding.

As of the fourth quarter of 2017, the total number of black and odorous water bodies recognized nationwide was 2236, of which 1723 had been treated and 270 were under treatment. The results of a follow-up survey of completed treatment projects show that most projects have achieved some results in eliminating black odors. However, due to the lack of continuity of technical plans, the water quality of water bodies is prone to rebound and black odors are repeated. In-situ and ex-situ coupled ecological restoration technology for urban water bodies can ensure the long-term maintenance of water quality after measures such as pipe interception, sediment dredging, and garbage cleaning. It has good ecological effects, strong pertinence, and low energy consumption., has broad application prospects.