Construction and operation of sewage treatment pla

2022-08-22
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Abstract: This paper investigates the construction and operation of Laixi sewage treatment plant, analyzes the existing problems, and discusses the improvement of the operation and management of the sewage treatment plant

key words: comprehensive treatment and operation management of urban sewage treatment plants

with the acceleration of urbanization, the pollution of urban industrial and domestic wastewater has become increasingly prominent. Strengthening the construction and operation management of urban sewage treatment plants, effectively controlling water pollution and improving the comprehensive functions of cities have become the important content of the construction of small and medium-sized cities at the county level and the implementation of sustainable development, How to strengthen the construction and operation management of municipal sewage treatment projects in small and medium-sized cities is the future of China's high-molecular materials industry. This paper makes an investigation, analysis and preliminary discussion on Laixi sewage treatment plant

I. Basic information of Laixi sewage treatment plant

Laixi sewage treatment plant is located about 1 km southwest of the urban area of Laixi, adjacent to the riverbed of pond river in the East and shuijifan Jiatuan village in the west, covering an area of 100 mu. The scale is 40000 tons of wastewater per day

(I) operation of Laixi sewage treatment plant

since the second phase of the project was put into use (2000), Laixi sewage treatment plant has operated normally and stably, and the sewage treatment effect is obvious. At present, the actual daily amount of wastewater treated by the sewage treatment plant is 27000 tons. According to the monitoring, the wastewater treated by the sewage treatment plant has reached the national level I standard for comprehensive sewage discharge, in which the concentration of COD is 65mg/l, bod7.3mg/l, and ammonia nitrogen is 0.7mg/l, The removal rate of major pollutants in wastewater is more than 95%. The direct effects after the operation of the sewage treatment plant: first, it has enhanced the urban environmental function and the degree of urban civilization of Laixi, improved the city image, laid the foundation for the economic construction and sustainable development of Laixi, and promoted the opening-up of Laixi. According to the survey, in 2000 alone, Laixi City introduced 87 foreign capital projects, with contracted foreign capital of 203 million US dollars and actual foreign capital of 105 million US dollars. The second is to reduce the pollution load. According to statistics, since November 2000 alone, since the operation of the second phase of the sewage treatment plant, the main pollutant cod1 in the water has been removed, and the quality of Zhuhe River and Dagu River has been significantly improved. According to the monitoring, the water quality of Zhuhe nianzhitou section in the past exceeded the class V standard of surface water, and now it has reached the class IV water quality standard. The jiangjiazhuang section of Dagu River in the past has reached the class V standard, and now it is close to the class III water quality standard. With the passage of time, the water quality of Dagu River will be further improved. Third, the ecological environment along the Dagu River has been improved, the past phenomenon that there is water that cannot be watered has been completely changed, and the public's response to the pollution of the Dagu River and pollution disputes have been significantly reduced, effectively promoting social stability

(II) main practices of Laixi sewage treatment plant project construction and operation management

1. All levels attach great importance to the construction of sewage treatment plant as a major event. Dagu River is an important water source of Laixi and Qingdao. It supplies more than 40 million cubic meters of water to the urban area of Qingdao every year, accounting for 1/4 of the urban water consumption of Qingdao. Laixi is located in the upper reaches of Dagu River. Due to the massive discharge of industrial and domestic wastewater in the urban area, it has caused more and more serious pollution to Dagu River, which not only restricts the development of agriculture along both banks of the river, but also directly affects the quality of water supply to Qingdao urban area. At the fifth session of the 11th Qingdao Municipal People's Congress in 1997, the NPC delegations of Qingdao and Laixi respectively proposed the proposal of "building Laixi sewage treatment plant as soon as possible to solve the pollution problem of Dagu River", and the two proposals were listed as important proposals respectively. In 1998, Laixi municipal government took the construction of urban sewage treatment plant as the No. 1 project, and established the project construction headquarters headed by the executive vice mayor, strengthening the organization and leadership of the construction of sewage treatment plant project. Qingdao municipal government attaches great importance to the construction and polishing of Laixi sewage treatment plant as one of the twelve practical things of the municipal government. The former mayor Qin Jiahao came to Laixi to work in person to solve the difficulties of insufficient funds, which has played a huge role in promoting the construction of Laixi sewage treatment plant

2. Scientific demonstration, long-term planning and phased construction

in order to thoroughly solve the pollution of sewage in the urban area of Laixi City to Dagu River, Laixi City has organized relevant departments to conduct repeated investigation and demonstration on the construction of sewage treatment plant. According to the sewage discharge in the urban area of Laixi City, the types and contents of pollutants in sewage and the basic situation of Dagu River and Zhu River, a relatively mature sewage treatment technology suitable for Laixi - Ober oxidation ditch process is selected, and the long-term construction goal is to treat 80000 tons of sewage per day, The recent construction scale is 40000 tons. In 1998, the first phase of the project was implemented, with a construction scale of 20000 tons of wastewater per day, and five supporting urban sewage pipes with a total length of 7500 meters were built. It was put into trial operation on December 28, 1998. The second phase of the project was constructed in 2000, with a scale of 40000 tons. It was put into trial operation in November. At present, the actual daily sewage volume of the sewage treatment plant is 27000 tons, which fully meets the needs of urban sewage treatment in Laixi

3. Raise funds from various sources to solve the construction and operation costs of sewage treatment plants. The problem of capital is one of the key factors to determine whether Laixi sewage treatment plant can be constructed and operated normally. In 1997, the annual financial revenue of Laixi City was 123 million yuan, and the total investment budget of the first phase of the sewage treatment plant project was 65 million yuan. Under the very tight financial situation, Laixi City actively overcame difficulties, raised 29.41 million yuan by itself, and won 36.59 million yuan from the Qingdao Municipal government, ensuring that the main works of the sewage treatment plant and the supporting construction projects of urban sewage pipes were started on schedule. With the increase of urban drainage, the first phase of the project is difficult to treat all urban sewage. In 2000, Laixi municipal government raised another 10.1 million yuan, won a loan of 16million yuan from the State Planning Commission, and allocated 4million yuan to start the second phase of the project, which was successfully completed and put into trial operation in November 2000. In order to ensure the normal operation of the sewage treatment plant, the municipal government allocates 3million yuan from the finance every year as the treatment cost of the sewage treatment plant. In 1999, Laixi Price Bureau The Finance Bureau jointly issued the notice on the charging standard of sewage treatment fee (Xi Jia Zi [1999] No. 29) and the notice on adjusting the price of tap water (Xi Jia Zi [1999] No. 28) The price of domestic water for residents will be increased by 0.15 yuan per square meter, that of industrial water, administrative water and business service water by 0.2 yuan per square meter, and that of self provided water sources by all units will be increased by 0.16 yuan per square meter. The part of the price increase can raise 2million yuan a year as the operation cost of the sewage treatment plant, reducing the financial burden

4. Establish the operation mechanism of sewage treatment plant and strengthen the operation management of sewage treatment plant

since the completion and operation of Laixi sewage treatment plant, Laixi municipal government has included the sewage treatment plant as an institution with the maximum amount of funds that can be accepted by the host into the management of the Municipal Construction Committee, and established a strict

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