Re: Ji'nan Xiaoqing River pollution rebound 4 puzzle water ecological city construction
sewage treatment saturated
treatment plant full load operation still has a gap
as the main body of urban pollution control, sewage treatment plants undertake most of the centralized treatment task. There are four sewage treatment plants in the urban area of Ji'nan, including one water purification plant, two plants, three factories and four factories, and the total design capacity is 630 thousand tons per day. Zhao Lichun, deputy general manager of Ji'nan Co., Ltd., told reporters that with the improvement of the living standards of urban residents and the increasing amount of sewage collection, the sewage treatment plant was gradually "overwhelmed", and all four water purification plants were fully loaded. "As the influent concentration of a plant exceeds the maximum design maximum, although some 280 thousand tons of sewage are treated this year, the amount of water treated according to the water quality of the design is equivalent to 400 thousand tons per day." Zhao Lichun said, "with the city's rain and sewage diversion, river regulation and pipe network renovation work, sewage collection pipe network gradually improved, the upstream sewage volume is increasing, and the concentration often exceeds the standard, the current sewage treatment pressure is close to the limit of the facilities."
according to Tang Qigang, director of Ji'nan urban flood control office, the total daily sewage volume in the city is around 800 thousand tons. At present, a sewage treatment plant is built in the high and new hi-tech zone, with a daily treatment of 30 thousand tons. At present, 10 scattered sewage treatment facilities have been built in the city. The daily treatment of sewage is about 70 thousand tons, and the capacity of the municipal sewage treatment has reached more than 70 tons. "Because some parts of the sewer system are hard to collect and unable to handle, there are some gaps, which can only be overflowing or straight row, but not many." Tang Qigang said.
for the lack of centralized processing capacity, Tang Qigang said that municipal departments are stepping up the construction of the two phase of the water purification three plant. The sewage disposal capacity of the three factories will be raised from 100 thousand tons to 200 thousand tons now, and this year will also be a part of the decentralized sewage treatment plant, and the municipal sewage treatment will be completed at the appointed time. The capacity will basically meet the current sewage treatment needs.
urban sewage treatment plant treatment plant
processing plant design processing volume
300 thousand tons per day / day 280 thousand tons / day 220 thousand tons / day 220 thousand tons / day three factory 100 thousand tons / day 120 thousand tons / day four factory 30 thousand tons / day 50 thousand tons / day
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half water treatment space has not been implemented by
the Interim Measures for the construction and management of water facilities in Ji'nan city in 2003. The extension of the water facilities has reached 10 years, and the water saving work in Ji'nan goes to the forefront, but it also faces the bottleneck of development. Different from the "full support" of sewage treatment plants at full capacity, the water stations in some scattered cities in our city suffer from the embarrassing situation of "not enough to eat".
reporters repeatedly followed Ji'nan water saving office staff to carry out water-saving inspection, found that facilities idle frequently. Wang Xin, deputy director of the municipal water saving office, introduced 206 water treatment facilities in the city, with about 229 thousand cubic meters of water per day, and 115 thousand cubic meters per day in the city. According to the calculation, half of the water treatment space is still not used. "Nearly half of the utilization rate is very good in the country. Every day, more than ten thousand tons of water can be used, and the effect of water saving is very considerable in one year. Only some small medium water stations are not used by the operation cost and the use of water," Wang Xin said. Ji'nan stipulates that a building with an area of more than 20 thousand square meters must support the construction of reclaimed water facilities. However, after the establishment of the developer, the water facilities are managed by the property department. Because of the lack of professional managers and operating costs, the "sleeping" phenomenon of the water equipment is common. At the same time, the lack of availability is also one of the reasons for the suspension of the medium water facilities. Most of the areas have small green area, and the water flush toilet is short of pipes.
problem 4
pipeline network arrears a lot of
more than 70% of the old city of the old city is covered with
rain and pollution. The imperfect matching of the pipe network has been the bottleneck of the improvement of the sewage collection rate. At present, the urban sewage pipeline in Ji'nan is about 1200 kilometers long. Some old urban areas still use the underground pipe network in the 70s of last century. Because of its low design standard and narrow pipe diameter, it can't adapt to the current sewage demand.
according to the report of the Ji'nan municipal government in 2013, the 48 comprehensive Watercourse Renovation Project will be completed by the end of this year. The main and secondary dry pipes in the urban area will be all distributary of the rain and pollution, and the sewage will not be discharged directly into the river. In order to achieve this goal, Ji'nan launched a large-scale river channel pollution control and rain pollution diversion project. Before the end of August, 146 km of pipe network was completed to achieve no drainage of sewage.
however, the relevant departments encountered many resistance in the construction of rainwater diversion project, and the pressure of the river was one of them. According to the statistics of municipal departments, the total area of the urban river is about 3 million square meters, and the canopy covers an area of about 500000 square meters, especially in the old urban area and over 70% of the River shed canopy.
in addition, Ji'nan is facing great challenges in order to completely straighten out the collection of urban sewerage network and completely realize the diversion of rainwater and sewage. According to the Research Report on the large-scale development of municipal public utilities, it is concluded that if only a problem of construction and improvement of sewage collection pipe network is considered, the investment will be billions, and the main and secondary roads, roads and streets are almost all to be dug, and the quantity of engineering and the environment will be very large.
search for new water supply to restore the self purification capacity of river channel
as a resource deficient northern city. Compared with the southern cities, the water resources in Ji'nan are not only small, but also the problem of seasonal shortage is very prominent. Jie Yuzhong said, "because the precipitation in Ji'nan is concentrated in summer and the water supply is insufficient in winter and spring, the self purification ability of the water body is difficult to give full play to, and it also restricts the improvement of the water ecological environment to a certain extent. Therefore, in addition to the strengthening of the sewage treatment and the realization of the discharge of the standard, the search for new water supply will become a matter of work." It's urgent. "
reporters learned from the municipal water conservancy bureau that in recent years, Ji'nan has sought water supplies in many ways to improve the water environment of the city. Through the implementation of the south to North Water Transfer Project, the Ji'nan city can lead to 100 million cubic meters of water per year and 1 million 250 thousand cubic meters of water storage in the Daming Lake. The annual water quantity of the Yangtze River in Ji'nan can reach 80 Daming lakes. In addition to increasing water consumption, in recent years, many water conservancy projects, such as Tianshan irrigation area and Ji Ping trunk canal connected project have been started in recent years. Through the "channel" of various water systems, the Yellow River water, Yangtze River water and surface water multi water source water diversion can be realized, and the annual maximum water transfer capacity is estimated to be 300 million cubic meters.
at the same time, the Yellow River water and Changjiang River water, which is introduced to Ji'nan by various major projects, are used in addition to the domestic water and production water, and some of the water will be used as the ecological recharge water. For example, the water supply of Tianshan irrigation area and the Jinping trunk canal has been built from April 5th to Ji'nan from April 5th. The water supply will end in May 8th and water supply is 1591.. 70 thousand cubic meters has greatly improved the environment of Xiaoqing River. Jie Yuzhong said that, through the above measures, it is expected to form a long-term ecological water supplement mechanism, providing the normal ecological water supplement for Ji'nan in the non flood season, and restoring the ecological function of the river water.