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Trước khi điều trị được áp dụng rộng rãi bởi các ngành công nghiệp sản xuất tập trung nước thải hữu cơ, chẳng hạn như thực phẩm và các ngành công nghiệp dược phẩm. Việc di dời các đơn vị phân tán công nghiệp khu công nghiệp được khuyến khích rất nhiều ở Thượng Hải. | took strong measures against the major polluters in the city. Several pulp mills responsible for about 25 per cent of the biochemical oxygen demand BOD in the Huangpu River were closed down in the 1980s. Pre-treatment is now widely practised by industries producing concentrated organic effluent such as food and pharmaceutical industries. The relocation of scattered industrial units to industrial parks is very much encouraged in Shanghai. Pollution control in new and expanding projects has been quite successful by state-owned enterprises in Shanghai. In the 1980s the compliance rate of state enterprises with requirements for EIA and the three simultaneous actions reached 100 per cent in Shanghai. Due to the successful control of new pollution sources and some major polluters the pollution load from industry in 1990 did not increase relative to pollution in the mid-1980s although industrial productivity increased four-fold. Table II.3 Water quality planning objectives for the Huangpu River system Phased quality objectives Upstream section Downstream section Urban section Estuary of Changjiang River Water source protection zone Sub-water source protection zone Present DO mg l-1 5 4 6 BOD5 mg T 5 5 3 NH3-N mg l-1 1 1 0.5 Maintain current situation Maintain current situation No further worsening No further worsening Class II Short-term 1990 DO mg l-1 5 4 2.5 2.5 6 BOD5 mg T 5 5 10 10 3 NH3-N mg l-1 1 1 3.5 3.5 0.5 Attain Class II standard Attain Class III standard Eliminate anaerobic condition Eliminate anaerobic condition Attain Class II standard End of the century 2000 DO mg l-1 6 6 4 4 6 BOD5 mg T 3 1 5 5 3 NH3-N mg l 1 0.5 0.5 1 1 0.5 Protect Class II standard Attain Class II standard Attain Class III standard Attain Class III standard Attain Class II standard Despite the successes mentioned the water quality of the Huangpu River remains very poor because a large amount of remaining organic substances are still left untreated. There remains much more to be done if .
