Study On Aerobe's Characters In Midcourse Wastewater Because Of Restraining Effect

Papermaking industry lets out the castoff, wastewater and exhaustgas, which will lead environment pollution. Further more, middle andsmall plants hold on bigger proportionment in domestic paper makingindustry. Because of behindhand equipments and incompletemanagement, these plants haven't enough ability to treat all wastewater.Correlative research and technology don't extend quickly in them.Partial blow liquir enter aerobe's wastewater treatment system withmidcourse wastewater, which make midcourse wastewater to bigger andmore complexity. It increases midcourse wastewater's toxicity. Todayour country put importance on environment pollution. It has become afocus and difficulty problem, which eliminate midcourse wastewater'stoxicity and increase its biochemical trait.To aim at this problem, this study makes use of static and dynamicmethod. BOD5/ CODcr ratio is static method. Warburg breathingequipment is dynamic method. This article researched midcoursewastewater biochemical trait of different pulping and bleaching ways.Straw midcourse wastewater's biochemical trait of Soda-AQ cookingand Kraft cooking is good. The results of biochemical trait using staticand dynamic methods are the same. Straw midcourse wastewater'sbiochemical trait of Arbiso cooking and Ammonia base sufite cooking isnot good. Because they been restrained by SO32-and NH4+ ions inwashing wastewater. Further more, the results of biochemical trait usingstatic and dynamic methods are not the same. In realistic treatment,many plants that use two cooking methods mensurate a better BOD5/CODcr ratio, but get a worse effect. This experiment phenomenon canexplain this problem well. Through reiterative experiments, we get astraw midcourse wastewater's biochemical trait order with differentcooking ways. The order is Soda-AQ cooking>Kraft cooking>Arbisocooking>Ammonia base sufite cooking.Straw midcourse wastewater's biochemical trait orders equalapproximatively with same cooking methods and different bleachingmethods. In spite of cooking methods, straw midcourse wastewater'sbiochemical trait is the best with hypochlorite-peroxide bleaching.However biochemical trait is the worst with CE segment wastewater. Ifpaper making plants want to increase biochemical treatment efficiency.It is obvious that they must reduce or eliminate chlorine element inbleaching reagent. Comparing hypochlorite bleaching wastewater withCEH bleaching wastewater, the quantity of premilligram activatedsludge consuming oxygen is very close. Because the precision ofWarburg breathing equipment is not high, both biochemical traits can'tbe confirmed well and truly. Whereas, we are worth, both biochemicaltraits behave very similarly.On the side, Partial blow liquir enter aerobe's wastewater treatmentsystem with midcourse wastewater. So research midcourse wastewaterrestrains aerobe, poisonous matter in cooking wastewater must becalculated. This article studies critical initially, which four kinds ofstraw blow liquir restrain aerobe. Critical COD concentration is lessthan 4500mg/L and between 4500mg/L and 4000mg/L, which Soda-AQcooking wastewater restrain aerobe. Kraft cooking wastewater's criticalCOD concentration is less than 4000mg/L and between 4000mg/L and3000mg/L. Arbiso cooking wastewater's critical COD concentration isless than 3000mg/L and between 3000mg/L and 2000mg/L. Ammoniabase sufite cooking wastewater's critical COD concentration is less than1500mg/L and between 1500mg/L and 1200mg/L. This experimentconclusion more attest to restraining effect of poisonous matter in blowliquir, such as SO32-and NH4+ ions. Therefore, if plants adopt Arbisoand Ammonia base sufite cooking, they must pay attention to blowliquir ratio that enter midcourse wastewater. A mass of blow liquirinflood aerobe's wastewater treatment system will reduce aerobetreatment efficiency.This article researches straw midcourse wastewater biochemicaltraits of different cooking and bleaching methods systematicly. It notonly fills up the blank of basic research about straw midcoursewastewater biochemical traits, but also makes wastewater aerobetreatment system run more successfully. This article is able to providean economic and reasonable treatment way for paper making plants.This study has a high value on theory and economy.