"Water Pollution Prevention Plan of Action" requires centralized control of industrial concentration areas such as economic and technological development zones, high-tech industrial development zones, export processing zones and other places of water pollution. Before the end of 2017, industrial agglomeration area should be required to build sewage treatment facilities, Beijing, Tianjin, the Yangtze River Delta, Pearl River Delta and other regions completed one year ahead. Overdue completed, will be suspended approval and approval of its increased water pollutants construction projects, and to withdraw its qualifications in accordance with the relevant provisions of the park. Environmental Protection Minister Chen Jining recently in response to the NPC Standing Committee on the topic asks, "Water Pollution Prevention Law," law enforcement inspection report again emphasizes this requirement.
But it found that the current construction of industrial agglomeration area of sewage treatment facilities, operation and management revealed many shortcomings. Industrial agglomeration area sewage treatment plant construction in the end Difficulties children?
First, the lack of binding industrial agglomeration area planning, parks planning the introduction of industrial projects beyond the scope of the type, affecting the normal operation of sewage treatment facilities. Industrial agglomeration area positioning often with the economic development of the situation and change, with little consideration "waste" recycling economy and the way out from the technical and economic complementarity perspective. Changes introduced industrial projects so that in accordance with the original planning and construction of centralized wastewater treatment facilities running becomes difficult, and some can not even run properly.
Secondly, industrial agglomeration area sewage treatment plant design and construction standards can not meet the requirements of the park wastewater treatment. When the sewage treatment plant construction in many industrial agglomeration area, not from the feasibility of industrial wastewater discharge standards technical point of view, instead of using municipal wastewater treatment plant design ideas for construction, rarely start with proposed pollution from industrial wastewater pollutants features control of ideas, lack of preprocessing and wastewater quality control measures. This brings to the industrial agglomeration area sewage treatment plant discharge very difficult overall, there are security risks, resulting in some industrial agglomeration area after the completion of the sewage treatment plant has been unable to meet emissions standards.
Third, industrial agglomeration area sewage collection pipe network is not conducive to take over the business regulation. Most industrial waste through the use of underground pipe or pressure pipe into the sewage mains metering wells, which created the conditions for individual enterprises illegal waste-water treatment of industrial wastewater. Since a large number of features pollutants (such as sodium, nitro compounds, fungicides, etc.) into the pipe network or seriously short of excessive emissions within some companies for some time, leading to the sewage treatment plant biochemical process collapsed, paralyzed sewage treatment facilities, usually We need a month to two months of recovery to run properly.
Fourth, since the intake pipe take COD standard "one size fits all", into the tube reduced biodegradability, sewage treatment plant biochemical process design efficiency can not be achieved. Some enterprises in order to reduce its cost, pre-processing means use of biological treatment process, the removal of easily degradable organic matter, in order to achieve takeover standards. Also some enterprises discharge wastewater biodegradability high, the stable operation of industrial agglomeration area of sewage treatment plants have promoted, but in order to meet a uniform standard to take over the construction of chemical and biological pretreatment facilities, in addition to carbon and other useful components, is not conducive to Park sewage treatment plant uptime and overall energy conservation.
Fifth, pretreatment enterprise wastewater, industrial wastewater outfall network management and sewage treatment plants operational management to implement long, is not conducive to the normal operation of sewage treatment facilities. At present, companies building their own wastewater pretreatment system run by the owners and management; pre-processing means the discharge opening from the environmental protection department of supervision; industrial wastewater discharged into the pipe network by the municipal department responsible for licensing; sewage treatment plant outfall and by the environmental protection department of supervision. Park sewage treatment plant is not functioning properly, the sewage treatment plant put the blame on the water pipe network design does not meet the standard requirements that environmental protection departments of the sewage business regulation in place, failed to meet pre-treatment; and whether to allow the enterprise sewage discharged into the network decided by the municipal departments, environmental protection departments have failed to grasp the relevant circumstances, prone to manage vacancies and vulnerabilities.
To ensure long-term industrial agglomeration area, stable and healthy development, good park wastewater treatment work, the need for innovative management system. Combined with the current industrial agglomeration area sewage treatment plant construction and operation and management problems, I made the following recommendations:
To maintain industrial agglomeration area planning EIA authority. Investment companies come to your business plan must be consistent with the requirements of the EIA review. Inconsistent with the planning of the EIA requirements of industrial enterprises in the environmental impact assessment before planning modifications will be allowed to enter the park, in order to ensure the normal operation of the entire campus environment infrastructure. Industrial agglomeration area sewage treatment plant design and construction must be determined in accordance with the EIA plan design of the main characteristics of pollutants treatment process, to ensure efficient and stable treatment effects and water quality standards.
To implement sub-quality corporate industrial wastewater into the net. Due to the special nature of industrial wastewater, must start from the roots of pollution: Depending on the nature of industrial waste water, waste water according to water quality, using different pretreatment standards to facilitate the operation and management of sewage treatment plants as a precondition conducive to centralized management standard emissions target, the use of different industrial waste water quality, overall coordination, improving the pollution source pretreatment. Focus is on the industrial agglomeration area as a whole to consider, such as centralized sewage treatment plant for the biological treatment of the main process for the high biodegradability of industrial wastewater, treated or may not be simple physico-chemical treatment into the pipe network; for biodegradability poor, biodegradable industrial waste water, the focus is to reduce the characteristic concentration of toxic organic pollutants by pretreatment of wastewater into the sewage treatment plant to ensure that, after mixing diluted biological treatment process can be completed.
Industrial wastewater discharge to implement weighted charges. In wastewater discharge standards and related industries water pollutant discharge standards, according to the overall planning of industrial agglomeration area, for different categories of various industrial waste water, according to the characteristics of pollutants factor development fees. This work should build upon the industrial agglomeration area planning, are classified for different industrial waste water, waste water treatment is difficult to sort out the payment processing standards and contaminant factor in determining post-fee basis weighted concentration, the concentration exceeds the base high costs greater weighting. Weighting factor by pollutant charges, encourage enterprises to implement cleaner production and reduce emissions.
To strengthen regulatory oversight, strengthening sectoral coordination. First, we must strengthen supervision and monitoring work to take over the business, not because the business park sewage discharged into the sewage treatment plant and relaxed supervision over enterprises, to ensure that enterprises sewage discharge standards to achieve the takeover; the second is the establishment of effective municipal and environmental protection coordination mechanism, strengthening the raw water control, prohibition of untreated wastewater pipe network admission standards of industrial waste water or difficult to handle; third is to increase the focus on monitoring enterprise and campus sewage treatment plant on its own monitoring and information disclosure supervision, supervision and monitoring of the national key enterprises required to carry out self-monitoring, and the situation and monitoring results to the public disclosure, to accept public supervision.