【正文】 more and more , to control water pollution and protect water resource have bee a human target . With the speedy development of the electroplating enterprise in our country,electroplating,as one of the biggest pollutions in the world,cause the pollution more and more severely. As we all know ,electroplating can produce wastewater with a lot of heavy metal ions ,and heavy metal wastewater also has many of toxic substances,which direct efflux without treatment will cause serious water ,it is important to remove heavy metal of the wastewater in the electroplating .Chemical and physical treatment of wastewater treatment is an important means of purifying sewage， however， The bination of the two approaches is more effective. This paper first describes the significance of heavy metals in waste water treatment，the hazardous of heavy metal plating ,basic status of electroplating wastewater treatment and treatment .For example (Biological , Physical chemistry ,Electrochemical ,Chemical method ), then bined with the actual conditions and processing requirements of a electroplating factory in Zhejiang province ,it is decide to use the bination of Physical method and Chemical method to treat the wastewater .Chemical method is the use of a neutralization method with flocculation. The physical method is the use of physical precipitation. The approach taken in the process simple and easy to operate and simple principle. For the use of chromiumcontaining wastewater flocculation reaction under acidic conditions should first be adding a reducing agent, the reduction of Cr6 + to Cr3 +, then add Ca (OH) 2 for chemical precipitation treatment. For copper ion, zinc ion, nickel ion, PH adjusted by calcium hydroxide, and for the precipitation treatment. Key words: wastewater containing chromium。 method of precipitation. I 目 錄 摘 要 .................................................................. I Abstract ................................................................. II 第 1章 緒 論 ............................................................ 1 重 金屬廢水的處理意義 .............................................. 1 電鍍行業(yè)重金屬廢水的危害 .......................................... 1 電鍍行業(yè)重金屬廢水處理的基本現(xiàn)狀 .................................. 2 電鍍重金屬廢水處理方法 ............................................ 2 生物法 ...................................................... 2 物化法 ...................................................... 3 電化學(xué)法 .................................................... 3 化學(xué)法 ...................................................... 4 第 2章 設(shè)計(jì)依據(jù)及內(nèi)容 .................................................... 6 自然資源 .......................................................... 6 廠址地理概況 ................................................ 6 氣候特點(diǎn) .................................................... 6 地質(zhì)資料 .................................................... 6 設(shè)計(jì)內(nèi)容及要求 .................................................... 7 工程概況 .................................................... 7 設(shè)計(jì)依據(jù) .................................................... 7 電鍍重金屬廢水處理后的水質(zhì)要求 .............................. 7 水質(zhì)水量 .................................................... 7 第 3章 污水處理工藝方案的確定 ............................................. 8 處理站選擇 ........................................................ 8 設(shè)計(jì)要求 .......................................................... 8 設(shè)計(jì)規(guī)模 .................................................... 8 水質(zhì)水量及處理要求 .......................................... 8 設(shè)計(jì)原則 .......................................................... 9 工藝方案與工藝流程 ................................................ 9 第 4章 主要處理構(gòu)筑物的計(jì)算 ............................................. 11 反應(yīng)調(diào)節(jié)池 ....................................................... 11 設(shè)計(jì)參數(shù) .................................................. 11 II 工藝尺寸 ................................................... 11 進(jìn)出口及液位 ............................................... 11 提升泵 ..................................................... 12 調(diào)節(jié)池水泵揚(yáng)程計(jì)算 ......................................... 12 中和池 1 ......................................................... 13 設(shè)計(jì)參數(shù) ................................................... 13 工藝尺寸 ................................................... 13 進(jìn)出口及液位 ............................................... 13 絮凝反應(yīng)池 1 ...................................................... 13 設(shè)計(jì)參數(shù) ................................................... 13 工藝尺寸 ................................................... 14 進(jìn)出口及液位 ............................................... 14 沉淀池 1 .......................................................... 14 參數(shù)選取 ................................................... 14 工藝尺寸設(shè)計(jì) ............................................... 15 生物接觸氧化池 ................................................... 16 設(shè)計(jì)參數(shù) ................................................... 16 生物接觸氧化池填料容積 ..................................... 16 生物接觸氧化池總面積 ....................................... 17 設(shè)計(jì)計(jì)算 ................................................... 17 污水與填料接觸時間 ......................................... 17 接觸氧化池總高度 ........................................... 17 生物接觸氧化池需氣量計(jì)算 ................................... 18 空氣管道計(jì)算 ............................................... 19 調(diào)節(jié)池 2 .......................................................... 19 設(shè)計(jì)參數(shù) ................................................... 19 工藝尺寸 ................................................... 19 進(jìn)出口及液位 ............................................... 20 配套設(shè)備 ................................................... 20 調(diào)節(jié)池水泵揚(yáng)程計(jì)算 ......................................... 20 中和池 2 .................