How to determine operating conditions by water color and odor

The last edit to this post was made by zouchaohao on 2015-9-6 at 08:59; it is possible to determine whether colored water has entered by observing whether the effluent from the physical-chemical treatment area is colored； Observing whether foam is generated at the water jump in the materialization zone can determine whether detergent has entered. .Black, thin liquid surface scum: Control the DO level to determine whether there is a relative deficiency or localized deficiency in dissolved oxygen. Comprehensive testing and verification are required. For the darkening of color caused by excessive oxygen deficiency in the wastewater itself, the excessive formation of sludge can be mitigated by enhancing the recirculation of wastewater. VI. Excessive black sludge accumulation and floating scum on the surface: Microscopic examination revealed no active sludge protozoa; the sludge particles were dispersed rather than flocculated, resulting in poor sedimentation properties. The supernatant was turbid, and the color of the settled sludge was dull and dark. Reason: Insufficient dissolved oxygen, resulting in local anaerobic or hypoxic conditions. VII. Brownish, thin liquid surface scum: The supernatant appears slightly turbid based on the sedimentation ratio, containing broken-down fine particulate matter; the water in between is clear. The scum is sticky and does not settle easily when stirred. Reason: F/M is less than 0.05, and this condition persists for an extended period of time. VIII. Brownish accumulation of excess liquid surface scum: 1. Related to filamental fungi ； Judgment of filamentous fungus swelling is made by combining microscopy with SVI or by using SV alone. 2. Related to denitrification by activated sludge: When combined with SV, it was observed that small sludge flocs rise to the surface and accumulate there; after stirring, they can sink rapidly ； Measure the C/N ratio to determine whether the influent contains excessive nitrogen; in cases of insufficient carbon sources, sludge is prone to denitrification, so it is necessary to ensure that the dissolved oxygen level is above 3 mg/L. Prevention and control of scum and foam: 1. Caused by issues related to the control of the wastewater itself: A. Incomplete sludge removal leads to an excessively long sludge age: a thin, brownish-yellow liquid appears ； Control sludge aging ； It can be confirmed in combination with F/M, SV, and mirror components. B. The sludge concentration is controlled too low, resulting in a high load: confirmation should be carried out by combining microscopic examination with F/M analysis. Check whether any non-active sludge organisms are present, and whether the F/M ratio is greater than 0.5.C. Filamentous fungi failed to be effectively controlled: D. Incorrect aeration method: excessive aeration. E. Insufficient addition of nutrients: Measure to eliminate scum foam: Spraying with water. B. Sludge drift in the secondary sedimentation tank: Reason: 10% is in the secondary sedimentation tank, 90% is in the aeration tank. 1. Excessive shock load in the aeration tank: A. Excess sludge load: Determine whether the effluent from the secondary sedimentation tank is turbid. B. Excessive surface load: high water inflow rate and insufficient residence time. 2. Aging of sludge in the aeration tank: delayed sludge removal, excessively low concentration of wastewater entering the system, and overly high control of sludge concentration. 3. Aeration tank sludge poisoning: It can be determined that the quality of the effluent has significantly deteriorated. 4. Denitrification in the secondary sedimentation tank: Control the DO at the end of the aeration tank and increase the recirculation rate. 5. Large amounts of inorganic particles enter the biochemical system: enhanced physicochemical effects 6. Excessive aeration in the aeration tank: Check DO. SV measurement, dissolved oxygen, sludge growth rate, microscopic examination, treatment measures: excessive sludge load, F/M greater than 0.5, slow sedimentation, diffuse turbidity in the supernatant, significantly low dissolved oxygen levels, below 30%. Excessive growth, exceeding 20%; the floc structure is small, fine, and loose; a large number of non-activated sludge protozoa appear; enhanced physicochemical effects; sludge aging, with F/M less than 0.03; increased sedimentation rate (90% settled in 3 minutes)