The Research On Composition And Advanced Treatment Technology Of SMP In The Liquor Wastewater

High concentration organic wastewater such as bottom pot water and bottom cellarwater will be produced during liquor production. The COD concentration of bottom pitwater up to140000mg/L and cellar water up to about20000mg/L."Fermentation alcoholand liquor industrial water pollutant discharge standards"(GB27631-2011) has providedthe very strict emission limits in particular for water pollutants produced in liquorbusiness located in environmentally sensitive areas (direct emission limit of COD is50mg/L), such as the Red River Basin Maotai liquor enterprise group. Biologicaltreatment system is used by most of the existing domestic liquor companies forwastewater. The water after treatment by the method of biological treatment systemcontains a variety of dissolved organic substances, including remnants of the originalmatrix, biodegradable intermediates and final products of degradation, and someun-biodegradable or non-biodegradable organic compounds, as well as Soluble MicrobialProducts(SMP).It is not deep enough for wastewater treatment by biological treatmentsystem only. SMP will not only reduce the efficiency of biological treatment system andeffluent quality,but also effect the impact of wastewater process and reuse ofwastewater.Research on the chemical composition of SMP is a hot field of biologicalwastewater treatment nowadays, composition studies on SMP has important practicalsignificance to compliance the wastewater discharge standards, but a variety of researchstill in its infancy and it is rarely to see the researches of depth treatment of SMP.The paper took the method of secondary biological treatment to treat the highorganic concentration wastewater from Maotai liquor corporations in the Red River basin,used the means of UV and SPE-GC/MS to analyze the main component of SMP. Theresults of UV-Vis showed that:Water samples may contain two conjugated double bonds(conjugated diene or α, β-unsaturated ketone,etc.) and a simple and non-conjugated nelectron-containing chromophore groups (carbonyl,etc.),These groups with UVabsorption is probably characteristics groups of microbial products (SMP).SPE-GC/MS(hexane eluted) analysis showed that:the biochemical degradation of organic pollutants mainly containing esters, benzene, as well as a small amount of hydrocarbons, ketones,aldehydes,Which esters were detected31.61percent of total organic matter, followed byphenol accounted for15.27%;SPE-GC/MS (dichloromethane eluted) analysis resultsshowed that: the class of degradation of organic pollutants in waste water containingmainly for benzene, as well as a small amount of esters and alkanes.51.37%were foundto total organics including benzene;SPE-GC/MS (methanol eluted) analysis resultsshowed that: the class of degradation of organic pollutants in waste water mainly containesters, benzene, acids, and small amounts of ketones, hydrocarbons, esters, whichaccounted for always be detected in25.24%of organic matter, followed by benzeneaccounted for15.96%, accounting for13.86%acids.These complex organic polymercontaining a hydroxyl group, a carbonyl group, a carboxyl functional group was attachedto the benzene ring or multiple heterocyclic ring, biodegradable, and therefore difficultto be removed only with the biological treatment.It proposed the deep treatment solutionsfor the purpose of removal of SMP. Focused on the process of Fenton oxidation, activatedcarbon adsorption and Fenton oxidation-activated carbon adsorption to treat biochemicalwastewater effluent from liquor companies, the paper studied the effect of various factorson the treatment effect, and analyzed the reasons, came to the optimum processparameters.The results showed that the COD concentration in the effluent after aerobicbiological treatment for the anaerobic phase HRT for24h is423~48mg/L, SR(SolubleCOD) concentration is402mg/L~422mg/L and its consisting is as follows: residualcontent of BOD5is about1%; content of SI(un-soluble COD) is about22%~23%andcontent of SMP is about76%~77%. SMP in secondary effluent accounted for73%~74%of COD. Mainly organic pollutants of SMP are acids, acid, cyclic alkanes and ketones.The optimum conditions of Fenton oxidation is as follows: value of pH3.5, amount ofH2O2400mg/L, amount of FeSO4600mg/L and reaction time60min. Under this condition,the removal rate of COD reached81.56%and the COD concentration of effluent down to88mg/L. When satisfied the conditions of effluent after Fenton oxidation at pH5, atemperature of30℃, adding1.5g/L of activated carbon adsorption30min,the t COD of effluent reached38mg/L, which can meet the requirements of "Fermentation alcohol andliquor industrial water pollutant discharge standards"(GB27631-2011).