本文選題：種衣劑廢水　切入點(diǎn)：混凝沉淀　出處：《天津工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：種衣劑作為賦予農(nóng)用種子抗病蟲害功能的高效、安全、環(huán)保型農(nóng)藥制劑受到越來越多的關(guān)注。在種衣劑生產(chǎn)和提純過程中,會(huì)產(chǎn)生高COD、高色度和含生物抑制性農(nóng)藥(殺蟲劑、殺菌劑)的清洗廢水。針對(duì)此種廢水的性質(zhì),在種衣劑廢水處理工程中,為確保其出水達(dá)到《污水綜合排放標(biāo)準(zhǔn)》[GB8978-1996]一級(jí)排放標(biāo)準(zhǔn),選用采用混凝沉淀-厭氧-生物接觸氧化-深度氧化組合工藝對(duì)其進(jìn)行處理,以出水COD和色度為主要指標(biāo),考察各主要處理單元以其及組合工藝的處理效果。在混凝沉淀處理單元,考察了混凝劑的種類、助凝劑及其投加量和投加量等參數(shù)工藝和操作條件對(duì)COD和色度去除效果。其實(shí)驗(yàn)結(jié)果表明該研究發(fā)現(xiàn),混凝沉淀處理該類種衣劑廢水效果明顯,可明顯地提高廢水的可生化性,其COD和色度去除率分別達(dá)到81.7%和56.3%,BOD5/COD(B/C)從起初的0.28升至0.43,顏色由深紅色乳液變?yōu)橥该鞯臏\紅色。在生化混凝沉淀處理單元經(jīng)混凝沉淀預(yù)處理后的種衣劑廢水,采用"厭氧-接觸氧化"生化處理。在厭氧處理單元,穩(wěn)定運(yùn)行期的進(jìn)水COD約900.0 mg/L,容積負(fù)荷則維持在0.8 kg COD/m3.d和停留時(shí)間為24 h時(shí),廢水COD和色度去除率分別穩(wěn)定在33%和80%左右,其出水COD和色度分別保持在605.3 mg/L和150倍;在生物接觸氧化處理單元,其溶解氧濃度保持在4.0～6.0 mg/L之間,經(jīng)24 h 運(yùn)行,其出水 COD 由 605.3 mg/L 降至 203.7 mg/L。在深度氧化單元,選擇Fe(Ⅱ)/次氯酸鈉(NaClO)氧化法,考察了 NaClO和FeSO4投加量和反應(yīng)時(shí)間條件等參數(shù)對(duì)出水COD的影響。其結(jié)果顯示表明,當(dāng)NaOCl投加量為5.0ml/L,FeSO4投加量為0.4g/L,以快速(200r/min)攪拌1 h,出水種衣劑廢水的COD去除率達(dá)到約為55.2%,最終出水的COD為94.5 mg/L。經(jīng)過本研究選用的組合工藝處理后的種衣劑廢水,COD從最初的4400 mg/L降至94.5 mg/L,去除率高達(dá)97.8%,色度從最初的1600倍降至無色。
[Abstract]:Seed coating agents, as an effective, safe and environmentally friendly pesticide preparation to endow agricultural seeds with resistance to diseases and insect pests, have attracted more and more attention. In the production and purification of seed coating agents, high COD, high color, and biosuppressive pesticides (insecticides, insecticides, insecticides) are produced. Cleaning wastewater of fungicides. In order to ensure that the effluent meets the first class discharge standard [GB8978-1996] in the seed coating wastewater treatment project, The coagulation-sedimentation, anaerobic, biological contact oxidation-depth oxidation process was used to treat the effluent. The COD and chromaticity of the effluent were taken as the main indexes. The treatment effect of each main treatment unit and its combination process was investigated. In the coagulation sedimentation treatment unit, the kinds of coagulant were investigated. The effects of coagulation aid, dosage and dosage of coagulant on the removal of COD and chromaticity were studied. The experimental results showed that the coagulant sedimentation treatment of this kind of seed coating wastewater was effective, and the biodegradability of the wastewater could be improved obviously. The removal rates of COD and chromaticity reached 81.7% and 56.3% respectively from 0.28 to 0.43, and the color changed from dark red emulsion to transparent light red. In the anaerobic treatment unit, the influent COD of stable operation period is about 900.0 mg / L, the volumetric load is maintained at 0.8 kg COD/m3.d and the residence time is 24 h, the removal rate of COD and chroma of wastewater is about 33% and 80%, respectively, in the anaerobic treatment unit, and when the volume load is maintained at 0.8 kg COD/m3.d and the residence time is 24 h, the removal rate of COD and chromaticity of wastewater is about 33% and 80% respectively. The COD and chroma of the effluent were kept at 605.3 mg/L and 150 times respectively, and the dissolved oxygen concentration in the biological contact oxidation unit was kept between 4.0 mg/L and 6.0 mg/L. After 24 h operation, the COD of the effluent decreased from 605.3 mg/L to 203.7 mg / L in the deep oxidation unit. The effects of NaClO and FeSO4 dosage and reaction time on the COD of effluent were investigated by the method of Fe (鈪，

本文編號(hào)：1645300