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Gelatin gelatin production process wastewater is discharged wastewater various processes in general, after the end of mixing, with high alkali, high calcium, high chloride, high COD characteristics, wastewater pH gt; 11, Ca 2 content greater than 3g / L, Cl-content greater than 5000mg / L, COD of 1000 2 500mg / L, water complex, wastewater emissions, handling difficult. This paper studies on acid-treated gelatin through wastewater and activated sludge method and photosynthetic bacteria associated with these two methods to process it, explores the various process operating conditions and their treatment effects, and ultimately determine the use of \Experimental results show that: the higher the pH of the wastewater is required to neutralize hydrochloric acid and water, the pH dropped to 8.0 8 .5, both to meet the requirements of acidification, and will not consume too much acid. Micro-aerobic environment for wastewater acidification, control of dissolved oxygen is 0.5 0 .8 mg / L, HRT of 6 8 h, acidification can achieve better results. As a result of micro-aerobic, improved mass transfer effect, you can remove part of the COD, while the wastewater aeration process is not only Ca 2 and CO 2 generate CaCO 3 precipitation, reduced Ca 2 on the subsequent biological treatment impact, and make wastewater S 2 - All oxidation, avoiding waste into bio- treatment system S 2 - toxic effects on microorganisms. Activated sludge process in a short time can not make COD in wastewater discharge standards, and no nitrification occurred. The degradation of COD in wastewater treatment are mainly concentrated in the first 6h, removal rate reached 79 percent, followed by COD degradation is slow, small changes. After a long run, by the Cl-and Ca 2 the cumulative effects of large calcified compacted sludge, biomass reduction, the treatment effect is poor. Proportion of 10% by adding the return sludge wastewater treatment plant sludge compaction and timely discharge, sludge activity can resume. Using brush filler immobilized photosynthetic bacteria in the micro-aerobic environment after 24h treatment makes the basic standards of COD emissions broth supplemented run small dosage, dosing interval longer, reducing the photosynthetic bacteria wastewater treatment costs. The long run, by the CaCO 3 effects of aging biofilm not falling, biofilm growth accelerated, will lead to local anaerobic affect the treatment effect, can be mechanical scraping or destroy biofilms pickling The method of the filler recovery. Using photosynthetic bacteria and activated sludge process can be combined with that of COD within 18h down to 50mg / L. A \simple and economical way, ensure that the entire process of treatment effect.
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