Comprehensively improve the quality of water supply and continuously increase the welfare of the people Nanjing: Strive to build a modern water supply pattern

Water is the source of life. In recent years, Nanjing has comprehensively improved the quality of urban water supply, built a modern water supply pattern, scientifically managed water, constantly improved the water supply security system, and made efforts to realize the transformation from "qualified water" to "high-quality water".

Up to now, Nanjing has 6 public water supply enterprises and 13 water plants at district level and above. The total length of water supply network is about 11,800 kilometers, with a total water supply capacity of 3.95 million tons/day, serving a population of about 8 million.

According to the results of water quality sampling test of Nanjing residential secondary water supply in August, the sub-qualified rate of all water quality items is 100\%; Urban public water supply in August 16 water plants (companies) pipe network water quality inspection results, qualified rate is 100\%.

Water quality has been in the national leading level

In autumn, the Yangtze River in Nanjing is calm and calm in the sunshine, just like a quiet sleeping lake.

Standing in Nanjing Beihekou water plant overlooking, Nanjing Yangtze River Bridge looming. As the main water supply plant in the main urban area of Nanjing, it supplies nearly 1 million tons of water on average every day, and undertakes more than 60 % of the drinking water supply task in the main urban area. Due to the implementation of water source protection, here is no longer navigable, and the river curve, the water flow significantly slowed, the water is much clearer.

"In a sense, Jiajiang because it is flowing, and has a self-cleaning function, its raw water quality is always in the surface class II water level, and many indicators are better than class II, far better than many places of lake water quality." Nanjing Water Group Beihekou water plant deputy director Zu Zhenquan said. In addition to 24-hour online monitoring, the water plant conducts daily inspection of 15 items every day, including turbidity, PH value, ammonia nitrogen, COD and total number of bacteria, etc., and raw water and ex-factory water are tested. The monthly inspection has increased by 3 items to 45 items on the basis of the regular 42 items. In terms of specific water quality indicators, the national standard for turbidity is no more than 1NTU, and the water plant is basically stable at 0.1NTU throughout the year. The national standard of COD is not more than 4mg/L, here is 1mg/L; The national limit for ammonia nitrogen is 0.5mg/L; here it is less than 0.02mg/L. "As you can see from these indicators, our water quality is excellent, arguably leading the country."

Beihekou Water Plant is one of more than a dozen water plants in Nanjing. In order to ensure water quality, since 2007, Nanjing has implemented strict monitoring and inspection standards, gradually established a water supply testing system that combines enterprise self-inspection and government monitoring, laboratory inspection and online monitoring, and routine testing and emergency testing. It has fully implemented 106 full testing standards of "Sanitary Standards for Drinking Water". Water quality monitoring and inspection of ex-factory water, pipe network water, peripheral water and secondary water quality of public water supply enterprises and self-supplied water plants are organized on a monthly, quarterly and annual basis, so as to achieve full coverage of 42 water quality monitoring items "one plant at a time", and the water quality of water supply is maintained at an excellent level all year round.

According to Jin Yongjun, director of the water supply and saving management office of Nanjing Water Bureau, the six water groups responsible for the city's drinking water supply, their factory water, pipe network water, end water are under strict three-level monitoring, among which Nanjing Water Group, Jiangning Water Group factory level turbidity control below 0.2NTU, far better than the national standard of 1NTU qualified line. By entrusting professional institutions to conduct random inspection of water quality in water supply enterprises, in recent years, the average annual sample detection is about 10,000 times, the qualified rate reaches more than 99.9\%. Only in 2016 and 2017, the city carried out a total of 27277 water quality tests, among which 2868 pipe network water tests, the qualified rate of 99.93\%; Network end water 5775 times, qualified rate 99.93\%; Factory water testing 9954 times, qualified rate 99.98\%; Secondary water supply 8680 times, qualified rate is 99.66\%. The inspection results were publicized on the website, water-saving Weibo (the top ten Weibo of the national water system) and other network media. The frequency of publicity and the project were at the leading level among similar cities. In addition, Nanjing water department also arranged 17 points and 34 sets of real-time water quality testing equipment in the main urban area, key units, communities and booster stations in the new five districts, covering the whole city's regions and key water plants, and all the data were connected to the urban water quality supervision system.

"Unqualified water will not leave the factory, substandard water will not enter the pipeline network, and the people will have access to clean water and soothing water." The words of Zhang Xiaoke, director of Nanjing Water Bureau, are striking. This sentence, bearing the responsibility and responsibility of Nanjing water personnel, it is not only a commitment, but also the working principle of water personnel.

Draft do not forget to dig well, when you open the faucet at that moment, you have ever thought, every drop of water after a "long journey". This is inseparable from the hard work and silent dedication of thousands of water workers in Nanjing.

September 24, is the Mid-Autumn Festival, 8 p.m., a full moon in the sky, thousands of reunion. Nanjing Beihekou water plant at this time, workers Zhou Jian is inspecting the machine room, he has been on duty more than once in the Mid-Autumn Festival. He said he would call his family at the end of his inspection tour, which would be considered the Mid-Autumn Festival. And he is just one of the countless water workers in Nanjing. In order to ensure the safety and quality of water supply in urban and rural areas, Nanjing water workers silently stick to the front line, although the post is common, but the mission is sacred, the responsibility is heavier than Mount Tai.

  

Advanced treatment is accelerating the pace of delivering better drinking water to millions of homes

In the eyes of Nanjing water workers, the city water supply is "not the best, only better", to deliver more drinkable water to thousands of households, has become the persistent pursuit of the water supply department for many years.

According to the requirements of relevant provincial and municipal documents, Nanjing has determined that by 2020, the in-depth treatment of the city's waterworks will achieve the target of full coverage, further improve the safety of water supply, and achieve high-quality water supply. In the advanced treatment process, according to the water quality characteristics of the Yangtze River and the existing water plant conditions, the "ozone + activated carbon" process is mainly used at present. After deep treatment, the sensory indicators such as chroma, smell and taste of tap water are significantly improved, and the water becomes clearer and tastes better.

Up to now, the depth treated water in Nanjing has reached 950,000 tons every day, of which the Beihekou Water Plant phase I is 300,000 tons, Jiangning Binjiang Water Plant is 450,000 tons, and the newly built Longtan Water Plant phase I is 200,000 tons. In addition, Nanjing water authorities also actively guide and help water supply enterprises to promote the in-depth treatment and renovation project of water plants. At present, Chengnan Water Plant, Jiangpu Water plant has been fully under construction, Chengbei Water Plant, Shangyuanmen Water Plant, Beihekou Water Plant Phase II 600,000 tons, Jiangning Binjiang Water plant, ancient water plant and other plans to implement construction by the end of the year.

"The city's tap water in-depth treatment project has been fully launched, is speeding up the pace of transformation. The next step will be to strengthen docking and coordination, on the premise of ensuring project quality and construction standards, shorten the construction period as far as possible, achieve full coverage as soon as possible, so as to change the 'deep' treatment to the 'regular' treatment, so that more people can drink high-quality water with better taste as soon as possible." Nanjing Water Bureau water supply division director Sun Baoguang said.

The reconstruction of secondary water supply has formed the "Nanjing model", which has been widely promoted by the Ministry of Housing and Urban-Rural Development

In other words, the taste of tap water depends on the quality of the peripheral water, which is determined by the faucet in the user's home. No matter how good the quality of the factory water is, if the pipe network or the end of the water supply problems, there is nothing safe about water supply, let alone let people drink high-quality water.

In 2015, in accordance with the requirements of the Notice on Strengthening and Improving the Construction and Management of Secondary Water Supply Facilities for Urban Residents to Ensure the safety of Water Quality issued by the Ministry of Housing and Urban-Rural Development and other four ministries, Nanjing issued relevant documents on the basis of the preliminary pilot of secondary renovation to comprehensively carry out the reconstruction of secondary water supply facilities in the main urban area. Mainly for the old community of secondary water supply pipelines, pools, water tanks, pumping stations for comprehensive upgrading, with a new type of healthy environmental protection pipe replacement corroded aging cast iron pipe, galvanized pipe and other backward pipe, the pump station also realize the transformation from manual management to automatic operation, so as to achieve water supply enterprises direct pipe to households. Because the secondary water supply equipment itself selects high-quality materials, and the water supply equipment is completely closed operation, water and air do not directly contact, foreign bodies and impurities can not enter the pipe network, thus solving the problem of traditional water supply pool, water tank easy secondary pollution.

In order to do this popular project well, Nanjing City has set up a leading group for the reconstruction of residential secondary water supply, in which multiple departments and units, such as water affairs, construction committee, finance, planning, urban management, health, Nanjing Urban Construction Group, Nanjing Water Affairs Group, etc., have participated in and made joint efforts to promote it. The Municipal Water Resources Bureau has set up seven working groups to reverse the schedule and push forward the progress, leading and coordinating the renovation work. Each district head supervises the project progress and coordinates key and difficult issues. In the absence of the support of upper regulations and policies, all departments have the courage to innovate and gradually form the "Nanjing model" of secondary water supply transformation. In 2016, the Ministry of Housing and Urban-Rural Development highly affirmed the reconstruction of secondary water supply in Nanjing and proposed to popularize it widely.

The water supply facilities of many old residential areas in Nanjing lacked specifications and standards when they were built at the beginning, and many places had poor maintenance and management in the later period, which brought great difficulty to the secondary water supply renovation work. According to the requirements of Nanjing Municipal government, in accordance with the principle of "urgent before slow" and "easy before difficult", "good start" in 2015, "big head" in 2016, and "bone gnathing" in 2017, by the end of last year, 628 reconstruction tasks had been completed, 56 more than completed, and 200,000 households benefited from the main urban area.

Combined with the standardized reconstruction of secondary water supply, the management right of secondary water supply facilities is then transferred to the water supply enterprise, realizing the metering to households, meter reading to households, water pipe to households, comprehensively improving the water quality, and solving the problem of water safety in the "last kilometer" of residential areas. At present, the renovation of secondary water supply facilities in Nanjing New Fifth District and Jiangbei New District is being pushed forward with all efforts and is scheduled to be completed in 2019.

Strengthen the Protection of water source and purify the "Source of Life"

"Ask the canal which is so clear, to have the source of water to", the source of clean can flow, water source is the lifeblood of the city water supply, is the spring of life.

Over the years, Nanjing Municipal Party Committee and Municipal government have attached great importance to the protection of water source, strengthened the work and established rules and regulations. Documents such as Nanjing Drinking Water Source Protection Project Plan, Nanjing Water Resources Protection Plan and Nanjing Drinking Water Source Construction Planning Plan have been issued successively, providing a solid institutional guarantee for water supply safety and strictly implementing them.

Last year, the General Office of Nanjing Municipal Government issued the Opinions on Strengthening the Protection and Management of Drinking Water Source Areas, further clarifying the responsibility for the management and protection of water source areas, and standardizing the long-term management and protection measures such as cross-regional joint prevention and treatment, funding investment, management and protection organization setting, daily inspection and inspection, monitoring and information release.

  

Since 2011, in accordance with the standards of "guaranteed water quantity, qualified water quality, reliable operation and in place monitoring", the city has taken a series of engineering measures, including isolation protection system, monitoring and monitoring system, water conservation and wetland aquatic plant restoration, warning signs, to constantly strengthen the construction of water source to meet the standards. Eight water sources, Jiajiang River, Yanziji, Baguazhou (Zuocha) Shangba, Jiangpu-Pukou, Gucheng Lake, Zihuizhou, Zhongshan Reservoir and Convenient Reservoir, have passed the provincial inspection, ensuring that the water supply quantity and quality are both up to standard. The demolition and ship removal of the main workshop of Bao Shipyard in the Jiajiang water source area of the Yangtze River have been completed. The relocation of the intake of Chengnan Water Plant and the relocation of the intake pump house and pipeline of Zhongpukou Water Plant in the Pukou water source area of the Yangtze River have also been completed.

According to relevant laws, regulations and documents, Nanjing has basically completed the task of "demarcating" and "establishing" water source protection areas in cities at or above the county level. All water sources have been designated as protected areas, and the latest vector boundary map of drinking water sources above the county level was reported to the provincial Environmental Protection Department in May. In terms of setting up signs of the conservation area, the setting of boundary tablets and traffic warning signs in the water source protection area has also been completed in accordance with the construction requirements.

Water source protection is a comprehensive project, and the optimization of water environment requires the cooperation of multiple departments. Several years ago, Nanjing established the linkage mechanism of water source protection. The joint meeting system of drinking water source protection and management, composed of the departments of environmental protection, water, maritime and water security, formed the working mechanism of "unified coordination, information sharing, each performing his own duties and joint action". Joint law enforcement and inspection of the water source protection area were carried out on a regular basis. All-round and all-weather monitoring of water quality and hydrology in the water source protection area.

We will accelerate the construction of emergency water sources and strengthen management of water supply safety

"Further consolidate the emergency counter-water supply capacity of 150,000 tons per day and ensure the supply to the main urban areas. Once the Yangtze River centralized drinking water source is polluted, Lishui and Gaochun can supply clean water to the main city and provide emergency water for the residents of the main city. To continue to ensure the safety of urban and rural water supply, the construction of emergency water source has become a key work in 2018." Director Zhang Xiaoke said.

In recent years, Nanjing attaches great importance to the construction of emergency water source and moves forward in strict accordance with the requirements. Recently, the emergency water supply project in the main urban area takes Zhongshan, Fenghe Reservoir and Gucheng Lake as emergency backup water sources. Using the already built "River Diversion into Chun" and "River Diversion into Li River" engineering facilities, it has equipped the capacity of turning 150,000 tons of water into the main urban area every day for emergency, which can ensure the basic water demand of the main urban area under emergency conditions. The preliminary work of the construction project of Lvshuiwan Emergency water source Area is being accelerated. The construction plan has been preliminatively determined, and the project bidding, consultation and survey, design and other documents are being compiled at the same time. The flood control evaluation report has been submitted to the Yangtze River Commission of the Ministry of Water Resources for approval. Lvshuiwan water source area will be designed and constructed in accordance with the standing emergency water capacity of 3.4 million tons, greatly improving the emergency water supply capacity. Gaochun and Lishui districts have realized dual water supply, of which Lishui has convenient Reservoir, Zhongshan Reservoir and the Yangtze River water as alternate sources, Gaochun has Gucheng Lake and the Yangtze River water as alternate sources, Jiangning District has determined the Yangtze River Xinjizhou emergency water source site selection plan, Liuhe District is comparing the site selection plan.

Water supply safety is no small matter, the responsibility is heavier than Mount Tai. Over the years, Nanjing has attached great importance to urban water supply security, strengthened the sense of responsibility, and strictly implemented the water supply security system. It has set up a leading group for the construction of urban water supply security with the deputy mayor in charge as the leader and the leaders of relevant municipal departments as the members to coordinate and solve the key and difficult problems in water supply security.

With a high sense of responsibility, the competent department of water supply urges water supply enterprises to establish a self-inspection and self-evaluation mechanism, improve comprehensive management and comprehensive support capabilities, and ensure the implementation of high standards in production safety, process standards, equipment operation, water quality testing, pipeline inspection, security and anti-terrorism. Organize regular inspections of production safety in enterprises and emergency drills for water supply systems. Strict inspection system has been implemented, and water supply enterprises have generally established SCADA pipe network operation scheduling system, GIS system, pipeline inspection system, etc.

Inspections and real-time monitoring of water sources have been strengthened, with municipal and district water supply authorities conducting regular inspections, while water plants have assigned special personnel to conduct daily routine inspections to discover and solve problems in a timely manner. To improve the raw water monitoring and early warning capacity, Nanjing Environmental Protection Bureau carried out ten-day and monthly routine and full-index monitoring on the centralized drinking water source at or above the district level. Online monitoring facilities monitored eight raw water quality data including water temperature, DO(dissolved oxygen), PH value, ammonia nitrogen, permanganate index, TOC and COD in real time. An automatic water quality warning and monitoring station has been set up in the upper reaches of the Jiajiang water source of the Yangtze River to ensure real-time data control.

Establish the concept of service, the spring and satisfaction together to tens of millions

On September 28, Feng Guangqi, an elderly man living in Zhaoyuan, Mochouhu Street, Nanjing, called the citizen hotline 12345 to report the water leakage problem of the platform on the second floor of his house (12345 work order number DH180928). After receiving the work order, the staff on duty of Nanjing Water Group contacted the residents that night and made an appointment with the residents to come to the house for processing on October 2.

"Thank you very much indeed -- not only did they dig a very long trench to bury the new pipe, but they also helped to remove the mud from the side of the original pipe. Because of the newly dug trench, the construction workers not only restored the road surface well, but also took the extra soil away with plastic bags, helping to clean up the hundreds of square meters of the platform, and some places were even cleaned with the brush they brought." 70-year-old Feng Guangqi's words are full of sincerity and touching, "I have seen a lot of construction teams, such a careful and enthusiastic, really very satisfied. I'm going to give the water workers a thumbs up."

According to the relevant person in charge of the production command center of Nanjing Water Group, as a link to thousands of households, Nanjing Water service hotline "96055" opened 24 hours a day, wechat public account, online business hall and "12345" municipal government hotline have also become a bridge for timely communication and good service with users. We will solve problems for the people and do practical things. During the past National Day, the customer service hotline answered 4,568 calls and issued 1,339 work orders during the 7-day holiday. Emergency repair personnel of water supply pipeline were on standby 24 hours a day, and completed 891 repairs of various types in the city. "Customer satisfaction is our purpose, the water and satisfaction together to thousands of households is our glory." The person in charge said.

Relevant data show that in 2017, "96055" customer service hotline received 750,000 calls and issued 110,200 effective work orders; It received 11,800 work orders of "12345" hotline, with a total score of 966.34 in the year-end evaluation, ranking the second among 31 enterprises and public institutions in the city, showing the high-quality service image of Nanjing Water. In addition, Nanjing Water also organized more than 700 front-line workers in window units to carry out star-level service training to deepen the connotation of brand service and improve the service level.

Source: Xinhua Daily, page 7, October 18, 2018