Deepen the overall planning of land and sea, Binzhou does a good job in the total nitrogen management of rivers entering the sea
In Beicheng Sewage Treatment Co., Ltd., Binzhou City, Shandong Province, the reporter recently saw that 8 autotrophic denitrification filters were neatly arranged, and sewage treatment facilities were operating normally. According to the data of the central control system, the total nitrogen in the inlet water is 48.68mg/L, and the total nitrogen in the outlet is 7.91mg/L.
Jiang Guangzhu, general manager of Binzhou Beicheng Sewage Treatment Co., Ltd., told reporters: "We invested more than 1,200 yuan to take the lead in introducing 'sulfur autotrophic denitrification and denitrification technology' for transformation, and the denitrification effect is very good, and the total annual nitrogen emission reduction is expected to be about 105 tons." The advantage of this technology is that the inorganic chemotrophic and phototrophic sulfur-oxidizing bacteria use reduced sulfur as an electron donor under anoxic or anaerobic conditions, and at the same time use nitrate nitrogen in water as an electron acceptor to reduce it to nitrogen to complete the denitrification reaction process and achieve the purpose of reducing total nitrogen. It is a green denitrification process that is not susceptible to impact during operation, has high denitrification efficiency, low operation and maintenance costs, low denitrification sludge output, reduces carbon dioxide emissions, and greatly reduces total investment and operating costs. ”
In addition to the adoption of "sulfur autotrophic denitrification and denitrification technology" by Beicheng Sewage Treatment Co., Ltd., Binzhou City has also vigorously promoted the transformation of 5 sewage treatment plants and 65 nitrogen-related pollution sources under key control. The promotion and application of new nitrogen removal technology is a microcosm of Binzhou City's solid implementation of the special action for total nitrogen treatment of rivers entering the sea and its full efforts to play a good combination of punches.
Zhang Ruijie, deputy mayor of Binzhou City, recently introduced at the national meeting on the promotion of total nitrogen treatment and control of rivers entering the sea in key sea areas that in recent years, the Binzhou Municipal Party Committee and the Municipal Government have attached great importance to the protection of the marine ecological environment, and in accordance with the work idea of "typical guidance, key breakthroughs, and comprehensive promotion", comprehensively analyzed the source of total nitrogen in rivers entering the sea, deepened the overall planning of land and sea, and carried out special actions for total nitrogen treatment of rivers entering the sea, and achieved remarkable results in various tasks.
Relevant data show that in 2023, the proportion of excellent water quality in Binzhou's coastal waters in spring and summer will be 100% and 98% respectively. From January to November, the total nitrogen of 5 rivers and 3 rivers in transit increased by 32.31% and 18.38% respectively compared with the same period in 2022.
Adhere to prevention and control at the source, and increase the intensity of governance
Binzhou City, Shandong Province, located on the southwest shore of Bohai Bay, in the hinterland of the Yellow River Delta, is one of the "1+12" cities around the Bohai Sea, with a total coastline of 126 kilometers and a sea area of 1,896 square kilometers.
Strengthening the management and control of total nitrogen in rivers entering the sea is a key task to fight the battle of comprehensive management of key sea areas and strengthen the overall management of land and sea. To this end, Binzhou City organized capable forces to carry out investigation and remediation actions in 9 areas such as the upstream and downstream, left and right banks, and main tributaries of 5 rivers entering the sea and 3 rivers entering the sea, focusing on nitrogen-related direct discharge enterprises, and making every effort to do a good job in the "combination punch" of total nitrogen treatment in rivers entering the sea, and promote the continuous improvement of water quality in coastal waters.
Binzhou City has further promoted the action of "two clearances and one upgrading" of urban drainage (zero rain and sewage combined pipe network in built-up areas, zero black and odorous water bodies, and upgrading of urban sewage treatment plants) to make up for the shortcomings of urban drainage facilities. Since 2022, the city has invested 2.05 billion yuan to build, repair and renovate 146.18 kilometers of sewage pipe networks, 6 urban sewage treatment plants have reached the surface level Class IV discharge standard, and 4 black and odorous water bodies in urban built-up areas have achieved "long-term governance and long-term clean".
In view of the large number of livestock and poultry breeding, improve the level of pollution control, change free-range breeding to concentrated breeding, the city's large-scale breeding has reached more than 75%, 1808 large-scale farms, 650 farms along the river are all equipped with livestock and poultry manure treatment facilities. Promote the treatment, disposal and resource utilization of livestock and poultry manure, and achieve 100% matching rate of livestock and poultry manure treatment facilities. Rural domestic sewage treatment has been strengthened, and 2,777 villages in the city have completed domestic sewage treatment, and rural black and odorous water bodies have been effectively managed and protected. Promote the prevention and control of agricultural non-point source pollution according to local conditions, further optimize the layout of agricultural production, steadily promote the reduction of chemical fertilizers and pesticides, stabilize the coverage rate of soil testing and formula fertilization at more than 90%, reduce the amount of chemical fertilizer application by about 5.5% compared with 2020, and reduce the amount of pesticide application by about 13%.
Binzhou City invested 406 million yuan to promote the marine ecological protection and restoration project, completed the total area of marine ecological restoration of 3,924 hectares, and realized the restoration of 3,760 hectares of wetland, 366 hectares of Spartina alterniflora treatment, 271 hectares of salt marsh restoration, and 30 hectares of oyster reef restoration. Invest 150 million yuan in the downstream of sewage treatment plants along the Chaohe River and Qinkou River to build tailwater constructed wetland projects to reduce the total nitrogen concentration in the river.
Adhere to system management and control, and improve the level of governance
On the edge of the wastewater discharge outlet of Gezhouba Water (Binzhou) Co., Ltd., a sign is erected for the sewage outlet into the river, which includes the number, location, geographical location, implementation standards, the name of the water function area discharged, and the water quality protection target. Scan the QR code on the sign with your mobile phone to find all kinds of information from the main types of pollutants in wastewater to the discharge rules.
Binzhou City pays close attention to the supervision of sewage outlets, formulates and issues the "Binzhou City River and Sea Sewage Outlet Supervision and Management Plan", comprehensively draws a "road map" for remediation work, and the "One Picture Reading" interpretation case was awarded the first place in the "Top Ten" policy interpretation excellent cases of the municipal government. Carry out traceability, monitoring and remediation of sewage outlets, and establish signs to achieve ID card management. Eight key sewage outlets were selected, and automatic water quality monitoring microstations and video monitoring "electronic eyes" were installed to realize full-time supervision of the surrounding environmental conditions and external drainage quality and quantity.
Feng Guogang, director of the office of the Binzhou Ecological Environment Bureau and a fourth-level researcher, told reporters: "We pay close attention to regional joint control, implement the horizontal ecological compensation mechanism between county river basins, include total nitrogen reduction in the compensation clause, give full play to the role of financial incentives, and mobilize the enthusiasm of upstream and downstream counties and districts for coordinated pollution control." Improve the joint prevention and control mechanism of 'regional linkage, information sharing, complementary advantages, and unity to control pollution', implement joint law enforcement, and gather cross-regional joint efforts in pollution control. ”
Relying on the expert team in the field of marine environmental protection of the Chinese Academy of Environmental Sciences, Binzhou City has implemented projects such as pollutant flux monitoring and fine investigation of total nitrogen control in key rivers entering the sea, investigation of marine risk sources, and construction of beautiful bays, so as to provide accurate technical guidance for the city's marine environmental protection work. Help formulate the "Total Nitrogen Pollution Control and Control Plan" for Chaohe River and Qinkou River in the administrative area to achieve "one river, one policy".
In order to strictly control the spatial control of the shoreline of rivers and lakes, Binzhou City has strengthened the management and protection team of rivers and lakes to promote the "four chaos" of rivers and lakes in depth to effectively ensure the safety of the water environment. Efficient use of the municipal-level bay chief system information management platform, truthfully record the bay chiefs at all levels and bay managers to patrol the bay, one-click transfer of the problem to the relevant counties and districts, and urge them to deal with it within a limited time, and establish an efficient closed-loop online management system of "discovery-disposal-solution" of problems. Since 2023, river chiefs at all levels have patrolled the river for a total of 192,000 times and 57,000 kilometers, helping to solve 421 problems, while bay chiefs at all levels have patrolled the bay 77 times and bay managers at all levels have patrolled the bay 220 times, covering a mileage of 3,082 kilometers, achieving good bay management and protection results.
Adhere to process monitoring and consolidate the effectiveness of governance
"Flight monitoring and flight law enforcement have been carried out in the Chaohe, Qinkou and Xiaoqing River basins, with a total of 148 kilometers of river patrols, 14 samples of key river sections and nitrogen-related enterprises, 3 problems have been found, and relevant counties and districts have been urged to rectify them in a timely manner. This is a set of data for continuous flight monitoring and law enforcement that the reporter saw in the 31st issue of the "Special Action Report on Total Nitrogen Control in Binzhou Rivers Entering the Sea".
Since the beginning of this year, Binzhou City has strengthened front-line inspections, issued the "2023 Special Action Work Plan for Total Nitrogen Control of Rivers Entering the Sea in the City", and carried out trekking investigations in key sections of rivers entering the sea and main and tributaries in accordance with the "six-step work method", implemented "flight monitoring and flight law enforcement", accurately locked the high-value areas of total nitrogen, and handed over the problem points in a timely manner, so as to achieve the "pinching and peak shaving" of the total nitrogen index. Since the beginning of this year, a total of 132 problems in 10 batches have been assigned, and all rectifications have been completed.
Binzhou City has strengthened accurate analysis, adhered to the daily statistics, weekly analysis and monthly notification of automatic online monitoring data of river sections entering the sea, accurately grasped the trend of total nitrogen changes, and ensured the weekly, monthly and monthly with daily protection. If the long-term rebound of total nitrogen concentration is serious, use means such as notification, supervision, and interviews to consolidate responsibilities and give full play to the strength of all levels and departments to make concerted efforts to control pollution.
Wei Gang, chief of the water ecology and environment section of the Binzhou Ecological Environment Bureau, told reporters: "We have carried out in-depth investigation of sewage collection and treatment and total nitrogen treatment facilities in 12 industrial parks above the provincial level and 7 chemical parks in the jurisdiction, comprehensively identified the problems of the management enterprises, collection pipe networks and centralized sewage treatment facilities in the park, and formulated 'one park one policy' to solve historical arrears and improve the efficiency of sewage collection and treatment and total nitrogen treatment in the park." ”
In order to achieve the overall planning of land and sea, the Binzhou Municipal Bureau of Ecology and Environment, together with the Municipal Marine Development and Fisheries Bureau, Binzhou Coast Guard Bureau, Binzhou Maritime Safety Bureau and other departments, has established a normalized joint law enforcement mechanism, and in 2023, a total of 10 marine joint law enforcement actions have been carried out, inspecting 105 marine engineering projects, 252 marine aquaculture projects, and 27 marine risk source enterprises. Establish a maritime joint law enforcement information group, exchange administrative approval and law enforcement information between departments in a timely manner, and comprehensively share all kinds of basic law enforcement data. Up to now, a total of 103 pieces of data and information have been shared, and 10 water quality improvement measures have been discussed and conspired to improve the water quality of coastal waters, so as to solve various problems and hidden dangers in a timely manner and realize the co-governance and co-management of the marine environment.
