MB1870型球磨机噪声治理

球磨机运转时噪声很大,不仅生产操作时工人难以承受,而且对周围居民的生活环境造成严重污染.我们采用约束型粘弹阻尼结构减震,并结合吸声、隔声和消声技术进行综合治理,取得了良好的降噪效果.     

A pilot scale anoxic/oxic membrane bioreactor (A/O MBR) for woolen mill dyeing wastewater treatment

A pilot-scale( 10 m^3/d) anoxic/oxic membrane bioreactor( A/O MBR) was tested for dyeing wastewater treatment of woolen mill without wasting sludge in 125 days operation. Results showed that the effluent quality was excellent, i.e. effluent COD less than 25 mg/L,BOD5 under 5 mg/L, turbidity lower than 0.65 NTU, and colour less than 30 DT, and met with the reuse water standard of China. The removal rates of COD, BOD5, colour, and turbidity were 92.4%, 98.4%, 74% and 98.9%, respectively. Constant-flux operation mode was carried out in this study, and backwash was effective for reducing membrane fouling and maintaining constant flux. Membrane fouling had heavy impact on energy consumption. More attention should be paid on pipe selection and design for the sidestream MBR system, too.     

厌氧折流板反应器处理玉米秆纤维浆粕废水的研究

采用厌氧折流板反应器 (ABR)处理玉米秆纤维浆粕废水 ,研究了工艺条件和工艺特征。试验结果表明 ,在HRT为 2 4h ,OLR为 6 .5 6kgCOD/m3 ·d条件下 ,ABR能有效处理浓度为 6 5 6 0mgCOD/L的玉米秆纤维浆粕废水 ,COD去除率为 75 .1% ;ABR对负荷冲击有良好的适应性 ,且具有推流式和两相式反应器的双重特点。     

生物活性炭法深度处理纺织废水二级出水中生物活性的研究

采用上流式曝气生物活性炭法处理碱减量印染废水二级生物处理出水,利用TTC-脱氢酶活性(DHA)法监测反应器内DHA生物活性分布.研究发现反应器内生物炭表面附着生物膜活性较高,特别是反应器上部生物碳粒同样具有较高的DHA活性,这与反应器运行一年多能够保持对COD、色度和UV等较高去除率有一定关系.还研究了活性炭吸附、反应器反冲洗对DHA活性的影响.本研究为曝气生物活性炭法有效去除印染碱减量废水中难降解有机物提供了一定的理论依据.     

Determination of dibenzo-p-dioxin (DBD) and dibenzofuran (DBF) in paper pulp mill defoamer additives and in paper pulp samples

An analytical procedure has been developed for quantitatively measuring dibenzo-p-dioxin (DBD) and dibenzofuran (DBF) present at part-per-billion levels in paper mill defoamers and paper pulp using gas chromatography coupled with either low resolution mass spectrometry (GC-LRMS) or high resolution mass spectrometry (GC-HRMS).     

Chemical degradation and biodegradability increase

The mill waste water holds a large amount of polyphenols, preventing the biodegradation processes because of their inhibitory action on microbial growth. Thus, its disposal represents an environmental problem for the great olive oil producing countries in the Mediterranean area. In this work, we present the preliminary results from the application of a photo-oxidative process on mill waste water to evaluate the organic matter degradation potential and the biodegradability of the treated residue. The total organic carbon is reduced up to 35% after 6 hours but the cost-effectiveness is unfavourable. In contrast, the aim of toxicity reduction is less expensive and shows good applicable chances; after 2 h, the polyphenols concentration drops by 60%.     

脱木素工艺处理造纸废水的实践与机理

脱木素工艺为中小制浆企业的黑液治理提供了新的方法。系统中酸化纤维污泥减小碱木素胶粒间的斥力 ,吸附废水中已析出的木质素和细小纤维 ;酸破坏了系统中胶体的水化膜 ,增大了胶体的粒径 ;混凝剂中和胶体表面电荷 ,增加颗粒间的接触机会 ,同时发挥了絮凝沉降的作用。该工艺与传统工艺相比 ,减少了酸及混凝剂的用量 ,木素沉降速度快。当试验废水pH =5、绝干纤维污泥与进水CODCr质量之比为 1.1、硫酸铝投加量为 160mg/L时 ,CODCr去除率高于 63 %。     

侧联式球磨机的噪声控制

介绍了侧联式球磨机噪声产生原理及其噪声控制方法,选择了制作局部式隔声罩的噪声控制设计和装置结构.在中国铝业中州分公司热电厂球磨机上应用,取得了很好的隔声效果.     

生物活性炭法深度处理纺织废水二级出水中生物活性的研究

采用上流式曝气生物活性炭法处理碱减量印染废水二级生物处理出水，利用TTC-脱氢酶活性（DHA）法监测反应器内DHA生物活性分布。研究发现反应器内生物炭表面附着生物膜活性较高，特别是反应器上部生物碳粒同样具有较高的DHA活性，这与反应器运行一年多能够保持对COD、色度和UV等较高去除率有一定关系。还研究了活性炭吸附、反应器反冲洗对DHA活性的影响。本研究为曝气生物活性炭法有效去除印染碱减量废水中难降解有机物提供了一定的理论依据。     

Baseline study of methane emission from open digesting tanks of palm oil mill effluent treatment

Anthropogenic release of greenhouse gases, especially CO₂ and CH₄ has been recognized as one of the main causes of global warming. Several measures under the Kyoto Protocol 1997 have been drawn up to reduce the greenhouse gases emission. One of the measures is Clean Development Mechanisms (CDM) that was created to enable developed countries to cooperate with developing countries in emission reduction activities. In Malaysia, palm oil industry particularly from palm oil mill effluent (POME) anaerobic treatment has been identified as an important source of CH₄. However, there is no study to quantify the actual CH₄ emission from the commercial scale wastewater treatment facility. Hence, this paper shall address the CH₄ emission from the open digesting tanks in Felda Serting Hilir Palm Oil Mill. CH₄ emission pattern was recorded for 52 weeks from 3600 m³ open digesting tanks. The findings indicated that the CH₄ content was between 13.5% and 49.0% which was lower than the value of 65% reported earlier. The biogas flow rate ranged between 0.8 l min⁻¹ m⁻² and 9.8 l min⁻¹ m⁻². Total CH₄ emission per open digesting tank was 518.9 kg day⁻¹. Relationships between CH₄ emission and total carbon removal and POME discharged were also discussed. Fluctuation of biogas production was observed throughout the studies as a result of seasonal oil palm cropping, mill activities, variation of POME quality and quantity discharged from the mill. Thus only through long-term field measurement CH₄ emission can be accurately estimated.