气浮-生物接触氧化法深度处理再生纸生产废水

1、环境工程2003年6月第21卷第3期19气浮2生物接触氧化法深度处理再生纸生产废水姚来银(龙海市环境监测站, 福建363100摘要在化学絮凝2气浮方法基础上, 深度处理再生纸生产废水生物接触氧化法。运行情况表明:该治理工艺处理效率高, 中间水回用连续稳定, 排放废水稳定达标, 生产废水回用率达85%以上。关键词再生纸废水气浮接触氧化法深度处理1前言维分离、, 纸机废水循环1再生纸生产工业是以废纸为原料制造出不同用途纸制品, 大量生产废水。凝2造纸, 部分厂家回用部分处理后废水。随着水资源不断紧缺、污染物总量控制以及(G B35442001 造纸工业水污染物排放标准的正式实施, 再生纸生产废水回

2、用与深度处理刻不容缓。再生纸生产废水经化学絮凝2气浮处理后循环使用理论上可行, 但在实际中对产品质量有影响, 废水回用率很低。为此本文介绍在化学絮凝2气浮方法基础上串联生物膜法深度处理再生纸生产废水, 有效提高中间段水回用率, 达85%以上。其工艺简单, 操作方便, 系统运行稳定与费用低, 工程投资少, 可为再生纸生产厂家乃至造纸行业生产废水治理提供借鉴。2再生纸生产废水性质特点211生产工艺及水污染物产生环节19902000年再生纸工业环境统计资料, 生产每t 再生纸用水量100200t , 废水排放量60160t 。废水中主要污染物来自纸纤维和废纸中杂质暨有机物BOD 5、C OD Cr

3、和悬浮物SS 等, 针对龙海市3a 间(19992001年 市辖28家再生纸厂162份废水监测报告的统计, 其结果详见表1(处理前水质 。表1再生纸工业废水污染物监测结果统计表污染物浓度范围mg L -1浓度均值mg L -1含量kg t -1(产品COD Cr 47811706095410SS 36911605584914BOD 51266593663214注:每t 纸产生废水为60140t 。再生纸生产企业主要以国内外收购各种废纸为原料, 经水力碎浆、沉砂除杂质、纤维分离、筛浆浓缩、磨浆造纸等, 图1以龙海某造纸厂年产2万t 高强瓦楞纸工艺为例。废纸 水力碎浆机1#浆池3废水处理工艺再生纸

4、废水深度治理采用在化学絮凝2气浮工艺基础上串联生物接触氧化工艺是根据废水污染物性质与含量, 结合造纸生产用水和排放标准要求, 以实现生产废水治理成本低、废水排放最小化, 回用最大化。其治理工艺流程如图2。生活废水废格滤液调节(沉淀 池污泥干化设施泥饼外运气浮池中间水池回用于生产化粪池生化池出水达标排放高浓除砂器2#浆#3#5#浆池浆池浆池图1造纸生产工艺及水污染物产生流程图从图1看出, 再生纸生产废水主要来自碎浆、纤图2废水处理工艺流程图20环境工程2003年6月第21卷第3期311治理工艺原理废水由集水、导水渠经机械格栅进入调节(沉淀 池, 水中大块悬浮杂质被截除, 接着由水泵提升到气浮处理

5、系统。气浮池采用部分回流加压溶气工艺, 溶气水取自气浮池出水。气浮池前设有反应池, 与气浮池合建。气浮加药采用泵前加药PAC 或PAM 。气浮出水进入中间水池进行水量水质均衡调节。根据造纸工业水污染物排放标准, 结合生产用水水质要求, 利用系统工程控制方法, 大部分中间水回用造纸生产, 小部分水经污水泵泵入生化系统, 生化系统所需N 、P 等营养物质, 由厂区生活污水经化粪池厌氧处理气浮出水生化出水项目表2废水处理设施运行监测结果表pH 61157113SSCOD CrBOD 5浊度回用率NT U<10-%88-mg L -128153113mg L -11576217mg L -157

6理工艺技术要点(1 控制溶气水回流比为30%35%, 溶气压力维持0135014MPa 。(2 设置混合、絮凝区, ; 控制加药停留 80mg L 或PAM 20; 35pH =615715, 控制生化进水=78和可生化程度。(4 控制中间水回用率, 在保证生产用水指标实后提供。生化系统采用生物膜法中的生物接触氧化法, 填料采用聚氯乙烯塑料, 膜上生物量很大, , 小, , , 出水水质稳定, 。生化系统出水经沉淀池沉淀后达标排放, 也可采用MS ABP 无剩余污泥的多级活性生化处理工艺出水直接达标排放。污泥处理系统主要包括浓缩池、污泥储池、污泥脱水机。沉淀池底泥、气浮

7、浮渣经浓缩、脱水干化后泥饼外运填埋或综合利用。312工艺实际运行状况分析现废水资源化利用, 深度处理成本最小化, 控制接触氧化时间68h 、气水比201。313存在问题与对策(1 气浮浮渣量大, 污泥处置利用有待于解决; 目前正设想将污泥用于农业生产、建筑材料等, 使其尽快变废为宝。(2 进入接触氧化池的水可生化程度差; 调整进水pH 值并加入经化粪池处理过的生活废水或提供N 、P 营养物质。(3 化学絮凝剂部分成分对回用生产用水指标的以龙海某造纸厂年产2万t 高强瓦楞纸废水治理工程为实例进行分析。31211水质水量情况影响; 因造纸过程均采用硫酸铝为净水剂, 建议絮凝剂采用聚铝并添加调配适量

8、PAM 为佳, 寻找最佳最高废水回用率。4结论某造纸厂A 年产2万t (60t d 高强瓦楞纸, 废水产生量44405100t d (每t 产品约产生废水80t 。废水污染物浓度为C OD Cr 5781170mg L ,SS 5691158mg L ,BOD 5215536mg L 。31212处理运行效果通过龙海市某再生纸厂废水工程实例分析, 在化学絮凝2气浮治理设施基础上串联生物接触氧化工艺深度处理再生纸生产废水有很强的针对性和可行性。其工艺简单, 操作方便, 系统运行稳定且费用低, 工程投资少, 有效提高中间段废水回用率达88%, 利用回用水生产的高强瓦楞纸的横向环压强度、裂断长、耐破

9、度等技术指标均不受负面影响, 并且可节省20%左右硫酸铝用量, 每年可节约生产用水60%。作者通讯处姚来银363100福建省龙海市环境监测站电话(0596 6536678根据上述处理工艺设施调试运行2a 来, 运行效果良好, 先后通过达标验收和竣工验收。处理结果见表2(省、市、县三级监测站45频次监测数据平均值 。废水回用率达88%, 每t 产品废水排放量<916t , 废水污染物排放符合且优于G B35442001造纸工业水污染物排放标准。利用回用水生产的产品高强瓦楞纸的横向环压强度、裂断长、耐破度等技术指标均不受负面影响, 并且可节省20%左右硫酸铝生产用量, 每年可节约生产用水60

10、%多, 取得良好环境经济效益。2002-08-14收稿2E NVIRONME NT A L E NG INEERINGV ol 121,N o 13,June ,2003STUDY ON TREATMENT OF SAUCE WASTEWATER BY HY DROL YTIC ACI DIFICATION 2SBR 2AIRF LOAT PROCESS Tian Yu et al (7Abstract Based on the sauce wastewater treatment in practice ,a series experiments were conducted to inve

11、stigate the conditions of forming sludge and the degradation laws of C OD Cr and chroma in each unit. The relation between the variations of pH ,S VI ,microorganism biofacies and the effluent quality was highlighted and the cause of S BR sludge bulking and its effective control means were discussed.

12、 The results showed that after a sauce wastewater with C OD Cr and chroma being 3000mg L and 500tirnes was treated by hydrolytic acidification 2S BR 2airfloat process , the effluent s C OD Cr and chroma were reduced to 50mg L and 90times ,which con formed with the first grade discharge standard of G

13、 B1998267.K eyw ords sauce waster water ,hydrolytic acidification 2S BR 2airfloat process and degradation lawSTUDY ON TREATMENT OF AMI NO 2J ACI D WASTEWATER AND RECOVERY OF RESOURCEPeng Panying et al (11 Abstract Amino 2J acid wastewater is extracted with PCW 25extractant ,the rem oval rate of C OD

14、 Cr of is over 95%.Extract is backextracted with alkali for recovering amino 2J acid product. About 27. 9kg amino 2J acid (% is each cubic meter wastewater. The purity of the recovered amino 2J acid is in accord with the demands of has g ood economic and environmental benefits.K eyw ords amino 2J ac

15、id wastewater APPLICATION OF I N TREATMENT OF ANI MA L WASTEWATERLin Weihua et al (13 Abstract With the development of China s m odernization poultry farm ,environment around is becoming seriously polluted. In this paper ,the design of the process and its operation of CSTR 2S BR system applied to wa

16、stewater treatment project for farm ,are introduced. As for aerobic reactor , the denitrification effect is ideal ,with m ore than 99%for rem oval rate of nitrogen. And that ,reas onable structure of the reactor is helpful to make sure ideal effluent effect.K eyw ords anaerobic tank ,S BR reactor an

17、d project usageANA L YSIS OF CAUSES OF HIGHER CONCENTRATION OF SUSPENDED MATTERS I N EFF LUENT AND CONTROL Huang Zhengdao (16Abstract The internal and external causes of higher concentration of suspended matters in the effluent of trial run for X inglin Sewager T reatment Plant in Fujian Province we

18、re analyzed with an emphasis on the problems of process control etc of aeration tanks. The system could be operated stably and effectively ,whose effluent s indexes could all be up to the standard after carrying out correspondent measures and the additional treatment of organism pond.K eyw ords urba

19、n sewage ,suspended matter and controlADVANCED TREATMENT OF REC LAI MED PAPERMAK I N G WASTEWATER BY PROCESS OF AIRF LOAT 2BIOCONT ACT OXI DATION Yao Laiyin (19Abstract The paper describes the process of biological contact oxidation in the advanced treatment of reclaimed papermaking wastewater , bas

20、ed on chemical 2flocculation 2airfloat. The running results showed that the process was highly efficient and the reuse of intermediate water was continuous and stable ,the discharged wastewater reached standard steably ,the recovered rate of production wasewater was over 85%.K eyw ords reclaimed papermaking wastewater ,airfloatation ,contact oxidation process and advanced treatmentAPPLICATION OF NEW TYPE OF