The Study On Treatment And Reuse Engineering Of Water-jet Weaving Effluent And Its Key Technology

The water-jet loom is one of the most extensive weaving devices in Chinese textile industry.Though it is equipped with some advantages, including high production, good quality and low weaving expenses, lots of fresh water sources are required to be consumed. China has already had355000 useful water-jet looms until now. The annual water consumption has reached 450 million.During the period of weaving, lubricating grease and sizing agent are used, resulting in higher COD and SS in effluent. If waste water in water-jet looms can’t be processed and conducted water reuse effectively, it will pollute water seriously and case huge waste of water resources. With the increasing intension of fresh water resources and increasingly strict water quality discharge standards in various areas, the survival and development of effective governance in textile industry and reuse concerning enterprises are greatly impacted, thus it is imperative to process water-jet weaving and water reuse.In the paper, technological process of water-jet weaving effluent treatment and reuse engineering with the existing scale of 3000m3/d in Bashan Weaving Company is analyzed in details. Moreover, an engineering case is conducted economic analysis. Based on it, the key technology bottleneck of the engineering case is proposed. The comparative study between physical chemistry and bioanalysis is performed by aiming at the key technology.(1) Technological process features of the engineering case: the technological process with the subject of flocculation flotation+ deep filtering+ sodion exchange+ electroosmosis is applied.Main effluent indicators of every section include oil, COD, hardness and conductivity. The oil removal takes place at the section of flocculation flotation. The removal rate is 70.9%, 87.3%,86.7% and 90.6%, respectively. The hardness reduction mainly includes the sodion exchange section. The enter water hardness of sodion exchange section is 51.2mg/L and outer water hardness is 5.3mg/L. The removal rate of the section on hardness reaches 89.6%. The inlet waterconductivity of electroosmosis is 820μs/cm and outer water conductivity is 206μs/cm. The removal rate of the section on conductivity reaches 74.8%. Water reuse hardness is less than60mg/L, conductivity is smaller than 500μs/cm, and COD≤30mg/L. All of these satisfy water-jet weaving water requirements.(2) The economic analysis of the engineering case indicates that daily water reuse quantity in water reuse engineering is about 1820m3. The saved water rate in every year is 2.6904 million Yuan, financial net present value is 3.423 million Yuan, and financial internal recovery is 23.14%and is higher 5% than internal recovery of the industry, and static recovery is 6.23 years. Thus, it can be observed that water reuse engineering not only has a good environmental benefit, but also possesses a good economic benefit.(3) The comparison between physical chemistry and biochemical process in polyacrylate paste waste water: the effective treatment of polyacrylate paste has already become a critical technology in existing waste treatment and reuse engineering in Bashan Weaving Company. In the paper, the waste water treatment in sizing effluent generated in the preparation process of water-jet weaving is discussed. Moreover, the treatment effects of flocculence, sodium hypochlorite and anaerobe on polyacrylate paste are inspected. The COD removal rate of flocculence on paste effluent is only 11.7%. The COD removal rate of Sodium hypochlorite method on paste effluent is only 10.4%, while anaerobe’s removal rate on paste effluent can reach 30%. By contrast, it has a better effect than the treatment of anaerobe.(4) The operation study on efficient anaerobic reactor processing polyacrylate paste effluent:with the matrix of polyacrylate paste, with the carrier of helical symmetry and with the inlet water ph of 7.5-8.2, it finishes launching after two months. The COD removal rate of spiral symmetry anaerobic reactor on diluted paste effluent can reach 58%. The anaerobic granular sludge can be inoculated in the spiral symmetry anaerobic reactor. As HRT=3d, 25 ℃ and inlet water ph of7.5-8,2, it finishes launching after two months. The reactor is operated stably. Moreover, COD removal rate on diluted paste effluent can reach 58%. It proves that SSSAB for treating desizing wastewater is doable.