However, with the increasing number of chemical fiber cotton and dyeing products, wastewater biodegradable performance becomes worse, custom car wing mirror flag coverss the existing biological treatment system to remove the capacity decreases. In order to meet discharge standards requirements, then cascading chemical treatment after biochemical treatment methods to meet the discharge standards. Chemical drugs mainly in the chemical treatment, coagulation and sedimentation and coagulation flotation type. Practice, the largest pool for the coagulation and sedimentation patterns, this method is relatively simple operation and management. Biochemical and Physicochemical joint governance process, Screen Printed Car Flags can give full play to the ability of biological treatment to remove most of the organic pollutants, and the remaining organic pollutants and chroma by the chemical treatment method to bear, thus reducing pharmaceutical dosage, custom car wing mirror flag coverss so that reduce processing costs. Practice has proved that this is the economic rationality of governance suitable for
The late 1980s, due to the increase in the number of cotton blended fabrics, cotton woven products and dyeing wastewater, there is a certain amount of chemical pulp (PVA) biodegradable material, custom car wing mirror flag coverss so simply using aerobic biological treatment process is difficult to oxidation and decomposition, can not meet the discharge standards.
In order to solve the problem of discharge standards, the textile industry in the "Plan" developed during the low power of the anaerobic – aerobic biological treatment process. Race Car Flags For Sale The Anaerobic acid production phase anaerobic process, hydrolysis and acidification stage. Order to speed up the process should be adding cultured bacteria so difficult to degrade high molecular weight organic pollutants into more easily degradable low molecular weight organic pollutants. Provide more favorable conditions for aerobic biological treatment for the back, so that the wastewater treatment system, custom car wing mirror flag coverss to reduce the burden of the back of the chemical treatment unit has the more obvious damage and degradation of dyes and surfactants. During this period in order to improve the removal efficiency of biological treatment unit, Personalized Decorative House Flags the experimental study dosing dominant species to improve the removal rate. However, due to the cotton and dyeing wastewater volume is relatively large, long-running strains advantage is difficult to guarantee the normal operation rarely dosing dominant strain approach. custom car wing mirror flag coverss
Practice has proved that the main biological treatment, a combination of physical treatment and chemical treatment of dyeing wastewater treatment route is the governance of the current stable discharge line.
(A) cotton woven products and dyeing wastewater treatment
A. Wastewater treatment process: in all kinds of and dyeing wastewater, cotton and dyeing wastewater treatment process is more complicated. First, the cotton fiber itself of impurities, Yard Flags For Sale the second is in the blended product relatively large number of chemical fiber, also a change in wastewater quality, biodegradable performance variation, increased its processing difficulty, the typical treatment process shown in Figure 5-1 below.
and dyeing wastewater → grille → adjust the pool → anaerobic hydrolysis tank → → sedimentation tank – →
Dewatering sludge big – → sludge thickening tank → → disposal → emissions
Figure 5-1 cotton woven typical wastewater treatment processes
Two. The main process parameters:
① grille: the process grille general set of two, custom car wing mirror flag coverss usually a stationary trash rack grate, an automatic rotary grille.
② Adjust the pool: regulation pool generally has a pre-aeration, the air-water ratio of 3 ~ 5:1, pre-aeration on the one hand stirring to prevent precipitation, the other both removal of some organic pollutants in the role. Adjustment pool adjustment is generally T = 6 ~ 8h, the average COD removal efficiency of about 8%.