1. Current status of water environment quality and causes of pollution within the jurisdiction (1) Current status of water environment quality 1. Overall status of surface water environmental quality: The environmental quality of surface waters has deteriorated sharply, and the watershed pollution is serious. From north to south, the entire network environment, and has been at a disadvantage. In accordance with the requirements of the national surface water environmental quality standards, the surface water quality of our county should meet the functions of Class III water bodies and strive to be controlled within Class II water body standards. The water quality should meet the requirements of Class II protected areas for centralized drinking water sources, general fish reserves and Swimming area features. Comparative analysis of national standards and surface water monitoring data from monitoring stations in our county in recent years shows that the surface water quality in urban sections of the main stream of the Nen River in our county exceeds the four-category standard limit in the national standard, and in severe cases reaches the five-category standard limit, which is only applicable It can be used in general industrial water and recreational water areas where the human body is not in direct contact. There are two drainage outlets in the town, of which the oxidation pond drainage outlet in the west of the city is a combined rainwater and sewage outlet. The monitoring results in June 2002 were: suspended solids exceeded the standard by 13 times, chemical oxygen demand exceeded the standard by 18 times, and biochemical oxygen demand exceeded the standard by 51 times; The Lama River drainage outlet is the drainage outlet that receives the main industrial wastewater in the county. The monitoring results are: suspended solids meet the standard, chemical oxygen demand exceeds the standard by 7 mg per liter, biochemical oxygen demand exceeds the standard by 2 times, and ammonia nitrogen exceeds the standard by 10 times. The other two sections of the main stream of the Nenjiang River in the jurisdiction have Category III water quality, with ammonia nitrogen, permanganate index, transparency, suspended solids and other items seriously exceeding standards. The water quality of each tributary of the Nenjiang River system is even more worrying. Among them, the first-level tributary Woli River has a water quality of Category 4, the Menglu River has a water quality of Category 4, the Wodu River has a water quality exceeding Category 5, and the second-level tributary Nilu River has a water quality exceeding Category 5. 2. Groundwater environmental conditions: Groundwater bodies in urban areas are polluted. Due to the increasing accumulation of pollution, groundwater in some areas has become undrinkable. The water level in the southern part of the city has dropped, the water quality of the water supply source in the northeast is turbid, astringent, and has a peculiar smell. The drinking water of some residents in family buildings has flocculent sediment and peculiar smell. The drinking water of more than 170 residents in the southwest has been contaminated, and the quality of groundwater near the garbage dump has deteriorated. (2) Causes of water pollution 1. Domestic sewage from urban residents. The urban area generates 3.6 million tons of domestic sewage annually. Since our county does not have sewage treatment facilities, pollutants pass through the urban drainage system and are directly poured into the main stream of the Nen River from the sewage outlet in the west of the city, worsening the ecological environment of the water body. 2. Industrial wastewater. The Lama River in the town is a centralized discharge point for industrial wastewater and Tiedong domestic sewage. Although it has passed the "one control and two standards" acceptance, there are still 251,000 tons of sewage discharged into the mouth of the Lama River every year. In addition, each tributary has the Woli River receiving 100,000 tons of mining wastewater every year; the Loach River and Menlu River receiving 1.01 million tons of gold mining wastewater every year. 3. Soil and water loss. Due to barbaric activities such as deforestation, quarrying, sand mining in rivers, and illegal gold mining in various tributaries in the past few years, natural vegetation has been destroyed, ecological regulation capabilities have declined, and soil erosion has been aggravated. At present, the county's water and soil erosion area is 307,800 hectares, which is 30% of the county's operating area. The soil organic matter has dropped by 2%. The lost water and soil has entered the Nenjiang River system, causing the river's biochemical oxygen demand, chemical oxygen demand and ammonia nitrogen to seriously exceed the standards. . 4. Leakage from seepage wells, public toilets, drainage pipelines and some septic tanks in urban areas directly pollutes groundwater and leads to the deterioration of water bodies. 2. Measures taken by our county to prevent the deterioration of water quality 1. Implement total volume control, actively control key pollution sources, and consolidate the results of compliance with standards. In order to protect water quality and prevent water quality deterioration, while strengthening environmental management of construction projects, our county has focused on the treatment of key pollution sources and the consolidation of compliance with standards. By carrying out pollutant discharge declaration and registration, issuing pollutant discharge licenses, adopting centralized control and time-limited treatment and other measures, industrial and mining enterprises that discharge pollutants are strictly managed, and the water quality, water quantity, type and the setting of sewage outlets of water pollution sources are identified. Here, The total amount control indicators are allocated on a basic basis to control the industrial wastewater pollution within the jurisdiction within a certain range. 2. Implement ecological protection projects. Generally speaking, the industrial scale of our county is small, the economic type is mainly agricultural, and industrial pollution has little impact on water quality. Therefore, the county government regards the management of the ecological environment in the basin as the key to protecting water quality and quantity and achieving sustainable economic development. It has successively issued the "Ecological County Construction Plan", "Ecological Demonstration Zone Construction Plan", "Ecological Functions of the Upper Nenjiang River Basin" Protected Area Construction Plan" and "Nen River East Bank Wetland Ecosystem Protection Project Plan", through the organization and implementation of a series of plans and projects, have provided good ecological conditions for the restoration and protection of the natural environment of the Nen River Basin in the county. 3. Implement the strategy to promote key engineering projects.
In recent years, our county has incorporated water pollution prevention and control work into the county's national economic and social development plan and annual plan. It determines key water pollution prevention and control projects every year and promotes the improvement of water environment management. In order to protect the water quality of the main stream of the Nen River, construction projects such as Beijiang Park, urban drainage pipe network, and sugar factory oxidation pond pumping station have been organized and implemented. These infrastructures have played an important role in effectively improving the water environment. 4. Strengthen the construction of water environment monitoring network. In order to protect the water environment, our county has formulated the "Water Environment Function Protection Plan", which divides the main stream of the Nen River within the jurisdiction into four functional protection zones. According to different functional divisions, three monitoring points have been set up in comparison with the three sections. Over the past few years, through surveillance monitoring of 10 projects, 150 effective monitoring data have been obtained every year, which timely, accurately and comprehensively reflects the water quality conditions in dry, flat and wet periods, and provides water quality information for the Nen River water system and related departments. While establishing and improving the watershed monitoring network within the jurisdiction and optimizing the monitoring distribution, a provincial-level ecological monitoring station at the source of the Nenjiang River was established. 5. Carry out water pollution prevention and control work in accordance with the law. In order to effectively prevent and control water pollution and avoid water pollution accidents, our county has taken compulsory measures in accordance with relevant laws and regulations to comprehensively clean up the units that caused water pollution, so that the penalties and rectifications that should be punished will never be punished. Appeasement. As the main placer gold mining area, in order to standardize the order of placer gold mining, the county government organizes relevant departments every year to clean up and rectify illegal gold mining boats in the upper reaches of the main stream and tributaries, and strictly carry out unlicensed mining, cross-border mining, and gold mining boats that damage water bodies. Investigate and punish various illegal operations in accordance with the law. In addition, in response to the pollution incident of the Liuyuan Water Plant in the upper reaches of the Nenjiang River in Qiqihar City, our county organized relevant departments to conduct a comprehensive investigation. At the same time, in order to keep abreast of the water pollution status of the river, an environmental protection 110 linkage team and an environmental protection volunteer team were formed. A public participation and supervision system for water pollution has been established and improved. 3. Rely on the project to accelerate the process of water pollution prevention and control. As the water source and main conservation area of ??the Nen River, our county is bound to protect the Nen River water system. In terms of water environment management and urban water environment improvement, we should seize the favorable opportunity when the country revitalizes the Northeast regional economy, increase investment in protecting the Songhua River, protect the Mother River, and ensure the water quality safety of the Nilji Reservoir area, and make good use of its location advantages to build The ecological functional protection zone in the upper reaches of the Nenjiang River is used as a carrier, and relying on environmental protection projects, we actively strive for special funds from superiors and take advantage of the situation to accelerate the process of water pollution prevention and control. The first is the construction project of the ecological function protection zone in the upper reaches of the Nen River Basin. The "Plan for the Construction of Ecological Functional Reserves in the Upper Nenjiang River Basin" has been compiled. The "Plan" divides the county's ecological functional areas into three communities for planning and construction respectively, and implements three projects of water conservation, mountain control, and famine control to protect The basin mainly focuses on conserving water sources, controlling water and soil erosion, carrying out river basin vegetation restoration and reconstruction projects, focusing on building water source conservation forests and soil and water conservation forests, and establishing a complete watershed protection system. The estimated implementation cost of key project planning is 82.5 million yuan. The second is the gold mine ecological environment restoration project. Over the years, placer gold mining has caused ecological environment damage and water pollution in the main stream and tributaries of the Nen River Basin. According to provincial and municipal requirements, alluvial gold mining was banned across the province in 2005. The restoration of the gold mine's ecological environment will be the focus of our county's land remediation work in the future. In the ecological environment restoration plan for the placer gold over-mining area, the land department has identified the Sisge placer gold over-mining area as a key management project in accordance with the principle of overall planning and step-by-step implementation. The project has been submitted to the Municipal Planning Commission for approval, with a total investment of 7.752 million yuan. The third is sewage treatment and drainage pipe network construction projects. In order to completely solve the problem of urban sewage pollution, our county proposed to build a Nenjiang Town sewage treatment plant in 2002. It started operation in 2003, and its feasibility study report has been approved by the Provincial Planning Commission. This project should be started as soon as possible to improve the water quality environment of the Nen River Basin. The fourth is the “East-to-West Waste Discharge” project. The main industrial zone east of the railway in our county is currently discharged into the Lama River. The Lama River handles 250,000 tons of industrial wastewater every year. With the development of industry, the discharge of industrial wastewater will continue to increase. The Lama River passes through Dongcheng District and discharges directly into the main stream of the Nen River. It is the second sewage outlet in the town. The Lama River should be comprehensively managed, and pipelines should be laid at the same time to implement "east sewage discharge to the west" so that industrial wastewater can be discharged into the oxidation pond in the west of the city through the pipe network and be treated centrally after the sewage treatment plant is completed. It is estimated that the pipeline pump station project requires an investment of more than 10 million yuan. The fifth is the harmless disposal project of garbage. For many years, there has been no formal garbage treatment plant in our county. The existing garbage dump site is an abandoned pit formed by taking soil for brick making. The bottom is not leak-proof and is close to residential areas.
At present, all 400 tons of urban domestic waste, biochemical waste and medical waste produced per day are piled here. In order to control water environment pollution, our county is currently in urgent need of building a harmless garbage treatment plant that is leakproof and has the function of medical waste disposal.